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Early Tools and the Economy Line

Early Indestro Mfg. 9/16x3/4 Double-Socket Wrench

[Early Indestro 9/16x3/4 Double-Socket Wrench]
Fig. 81. Early Indestro 9/16x3/4 Double Socket Wrench, with Inset for Marking Detail.

Fig. 81 shows an Indestro 9/16x3/4 double-socket wrench, marked "Indestro Mfg. Co." and "Chicago U.S.A." on the shank. The sockets are broached with 6-point (hex) openings.

The overall length is 9.2 inches, and the finish is plain steel.

The sockets are marked with a five-pointed star on either side of the sizes, a notation frequently seen on early Indestro tools, and the sizes are written as "9 - 16" and "3 - 4".

Early Indestro Mfg. Triple-Socket Wrench

[Early Indestro Triple-Socket Wrench]
Fig. 82. Early Indestro Triple-Socket Wrench, with Insets for Marking Details.

Fig. 82 shows an Indestro triple-socket wrench marked "Indestro Mfg. Co.", with insets to show details of the company logo and the socket marking.

Note that the socket is marked with a five-pointed star to the left of the size, marked as "1 - 2".


Duro Metal Products 634 Quad-Socket Wrench

[Early Duro Metal Products Quad-Socket Wrench]
Fig. 83. Early Duro 634 Quad-Socket Wrench.

Fig. 83 shows an early Duro 634 socket wrench, marked "Duro Metal Products" on the round shank. The overall length is 10.6 inches.

This particular model has four socket openings, but other models were made with two or three sockets.


Duro Metal Products 600 1/2x9/16 Socket Wrench

[Duro 600 1/2x9/16 Socket Wrench]
Fig. 84. Duro 600 1/2x9/16 Socket Wrench, with Insets for Top View and Reverse Detail.

Fig. 84 shows a Duro 600 1/2x9/16 double-socket wrench, marked "Duro Metal Products Co." with "Chicago, U.S.A." on the reverse.

The overall length is 7.6 inches, and the finish is plain steel.

The model 600 wrench was one of the suggested tools for servicing the Chevrolet "6", and was used for manifold, fan bracket, and other applications. This model was no longer listed in the standard catalogs 38M and 39M, but was still available in a supplemental catalog from 1940.


Duro Metal Products 615 21/32 Socket Wrench

[Duro 615 21/32 Socket Wrench]
Fig. 85. Duro 615 21/32 Socket Wrench, with Inset for Bottom View.

Fig. 85 shows a Duro 615 21/32 socket wrench stamped "Duro Metal Products Co." on the shank.

The overall length is 9.1 inches, and the finish is plain steel.

This wrench was designed for Ford Model "A" and "B" connecting rod applications, and probably dates to the late 1920s or early 1930s. The socket of this wrench is made of hardened carbon steel, but later versions were offered in chrome-vanadium steel.


Duro Metal Products 617 9/16 Socket Wrench

[Duro 617 9/16 Socket Wrench]
Fig. 86. Duro 617 9/16 Socket Wrench, ca. 1935-1940.

Fig. 86 shows a Duro 617 9/16 socket wrench, stamped "Made in U.S.A." on the shank with "Chromium Vanadium" on the socket.

The overall length is 9.0 inches, and the finish is plain steel.

This example is not marked with the company name, but was identified by the model number, general construction, and use of the "Chromium Vanadium" marking. The catalogs describe this as a connecting-rod wrench, but note that it is not guaranteed due to the extremely thin socket walls, required for certain applications.

The socket is hot-broached in the style developed by Duro Metal Products, placing the manufacturing date in 1935 or later.


Duro Metal Products 0626 3/4 Speeder Socket Wrench

[Duro 0626 3/4 Speeder Socket Wrench]
Fig. 87. Duro 0626 3/4 Speeder Socket Wrench, with Inset for Marking Detail.

Fig. 87 shows a Duro 3/4 speeder socket wrench, stamped "Duro Metal Products Co." on the shank (see inset). The wrench is not marked with a model number, but is listed in the 1938 Duro catalog as a model 0626 rim socket wrench.

The overall length is 16.4 inches, and the finish is nickel plating.


Duro Metal Products 671 11/16 Ratcheting Box Wrench

[Duro 671 11/16 Ratcheting Box Wrench]
Fig. 88. Duro 671 11/16 Ratcheting Box Wrench, with Inset for Side View, ca. 1920s.

Fig. 88 shows a Duro 671 11/16 ratcheting box wrench of laminated steel construction, stamped "Duro Metal Products Co." and "Chicago" on the handle.

The overall length is 6.9 inches, and the finish is cadmium plating.

This tool was probably intended for adjusting the brake and reverse bands on the Model T Ford. Similar tools were made by various other companies -- see for example the Mossberg 645 Ratcheting Box Wrench.


Other Economy Tools


Early Indestro Nut and Tap Wrench Set

Indestro made a number of inexpensive open-end wrench sets intended as automobile tool kits or for casual homeowner use. These sets were typically made of stamped and hardened steel, and were held together by center bolts or by small metal holders. The next figures show examples of these sets.

[Early Indestro Nut and Tap Wrench Set]
Fig. 89. Early Indestro Nut and Tap Wrench Set, with Inset for Marking Detail, ca. Early to Mid 1920s.

Fig. 89 shows an early example of an Indestro "Nut and Tap" wrench set, marked with the Indestro name in script on each wrench. The set is held together with a stepped-diameter bolt, marked on the end with "Sure Seal Bottle Capper Co." and "Chicago", and with "Mfrs. Indestro Products" in the center.

The wrench sizes in the set are 3/8x7/16 (broken), 1/2x9/16, 5/8x3/4, and 7/8x1 inch. We don't have a specific catalog reference for this early set, and it's possible that there were originally five wrenches.

The Sure Seal Bottle Capper Company marked on the bolt head is an earlier business entity for Indestro Manufacturing, with operations beginning in 1921.


Indestro Nut and Tap Wrench Set

[Indestro Nut and Tap Wrench Set]
Fig. 90. Indestro Nut and Tap Wrench Set.

Fig. 90 shows another later example of an Indestro "Nut and Tap" wrench set, marked on each wrench with the Indestro name in script.

This set originally consisted of five wrenches (one is missing) covering a size range from 1/4 to 1 inch. The sizes in the set are 1/4x5/16 (missing), 3/8x7/16, 1/2x9/16, 5/8x3/4, and 7/8x1 inch.

The wrenches are held together by a center bolt and wing nut, and the bolt is made with stepped diameters to hold each wrench securely.

This set was listed in the 1938 Indestro catalog, but had probably been in production for a number of years by that time.

[Indestro 7/8x1 Inch Nut and Tap Wrench]
Fig. 91. Indestro 7/8x1 Inch Nut and Tap Wrench.

Fig. 91 at the left shows the largest wrench from the "Nut and Tap" set, a 7/8x1 inch open-end wrench of stamped steel construction. The overall length is 6.8 inches, and the finish is cadmium plating.

The square center hole clarifies the meaning of the "Nut and Tap" name, as the holes have been sized to grip the square shank of a threading tap. By using a square hole, Indestro extended the functionality at little or no additional cost.


Indestro 141 1/2x9/16 Box-End Wrench

Indestro produced box-end wrenches of stamped steel construction in a 14x model series, with sizes and models ranging from 3/8x7/16 (140) up through 15/16x1 (145). The wrenches were sold individually or as a six-piece set held together with a bolt and wing-nut.

The next several figures show examples of these wrenches.

[Indestro 141 1/2x9/16 Box-End Wrench]
Fig. 92. Indestro 141 1/2x9/16 Box-End Wrench.

Fig. 92 shows an Indestro 141 1/2x9/16 wrench of stamped steel construction, marked with "Indestro" and "Chicago, U.S.A." on the shank.

The overall length is 5.4 inches, and the finish is plain steel.


Indestro 142 5/8x11/16 Box-End Wrench

[Indestro 142 5/8x11/16 Box-End Wrench]
Fig. 93. Indestro 142 5/8x11/16 Box-End Wrench.

Fig. 93 shows an Indestro 142 5/8x11/16 wrench of stamped steel construction, marked with "Indestro" and "Chicago, U.S.A." on the shank.

The overall length is 5.9 inches, and the finish is plain steel.


Indestro 144 13/16x7/8 Box-End Wrench

[Indestro 145 13/16x7/8 Box-End Wrench]
Fig. 94. Indestro 144 13/16x7/8 Box-End Wrench.

Fig. 94 shows an Indestro 144 13/16x7/8 wrench of stamped steel construction, marked with "Indestro" and "Chicago, U.S.A." on the shank.

The overall length is 6.9 inches, and the finish is plain steel.


Duro 2116 Battery Pliers

[Duro 2116 Battery Pliers]
Fig. 95. Duro 2116 Battery Pliers.

Fig. 95 shows a pair of Duro 2116 battery pliers, marked "Duro Metal Products Co." and "U.S.A." near the pivot.

The overall length is 8.0 inches, and the finish is cadmium plating.


The Select Steel Line


Indestro Chicago 721 Open-End Wrench

[Indestro Chicago 721 5/16x3/8 Open-End Wrench]
Fig. 96. Indestro Chicago 721 5/16x3/8 Open-End Wrench, with Inset for Reverse Detail.

Fig. 96 shows an Indestro 721 5/16x3/8 open-end wrench, marked "Chicago - U.S.A." in the streamlined depressed panel, with "Drop Forged Select Steel" on the reverse.

The overall length is 3.8 inches, and the finish is plain steel.


Indestro Chicago 25 Open-End Wrench

[Indestro Chicago 25 1/2x19/32 Open-End Wrench]
Fig. 97. Indestro Chicago 25 1/2x19/32 Open-End Wrench, with Inset for Reverse Detail.

Fig. 97 shows an Indestro 25 1/2x19/32 open-end wrench, marked "Chicago - U.S.A." in the streamlined depressed panel, with "Drop Forged Select Steel" on the reverse.

The overall length is 5.5 inches, and the finish is nickel plating.


Indestro Chicago 729 Open-End Wrench

[Indestro Chicago 729 5/8x3/4 Open-End Wrench]
Fig. 98. Indestro Chicago 729 5/8x3/4 Open-End Wrench, with Inset for Reverse Detail.

Fig. 98 shows an Indestro 729 5/8x3/4 open-end wrench, marked "Chicago - U.S.A." in the streamlined depressed panel, with "Drop Forged Select Steel" on the reverse.

The overall length is 7.4 inches, and the finish is plain steel.


Indestro Chicago 731 Open-End Wrench

[Indestro Chicago 731 3/4x13/16 Open-End Wrench]
Fig. 99. Indestro Chicago 731 3/4x13/16 Open-End Wrench, with Inset for Reverse Detail.

Fig. 99 shows an Indestro 731 3/4x13/16 open-end wrench, marked "Chicago - U.S.A." in the streamlined depressed panel, with "Drop Forged Select Steel" on the reverse.

The overall length is 8.5 inches, and the finish is plain steel.


Indestro Chicago 731-A Open-End Wrench

[Indestro Chicago 731-A 3/4x7/8 Open-End Wrench]
Fig. 100. Indestro Chicago 731-A 3/4x7/8 Open-End Wrench, with Inset for Reverse Detail.

Fig. 100 shows an Indestro 731-A 3/4x7/8 open-end wrench, marked "Chicago - U.S.A." in the streamlined depressed panel, with "Drop Forged Select Steel" on the reverse.

The overall length is 8.5 inches, and the finish is plain steel.


Indestro "Chicago" 1/4x5/16 Short Box-End Wrench

[Indestro Chicago 1/4x5/16 Box-End Wrench]
Fig. 101. Indestro "Chicago" 1/4x5/16 Box-End Wrench, with Insets for Reverse and Side View.

Fig. 101 shows an Indestro "Chicago" 1/4x5/16 box-end wrench, marked with "Indestro" and "Chicago - U.S.A." forged into the streamlined depressed panel, with "Drop Forged Select Steel" forged into the reverse.

The overall length is 3.6 inches, and the finish is nickel plating.


Indestro "Chicago" 3/8x7/16 Short Box-End Wrench

[Indestro Chicago 3/8x7/16 Box-End Wrench]
Fig. 102. Indestro "Chicago" 3/8x7/16 Box-End Wrench, with Insets for Side View and Reverse Detail.

Fig. 102 shows an Indestro "Chicago" 3/8x7/16 box-end wrench, marked with "Indestro" and "Chicago - U.S.A." forged into the streamlined depressed panel, with "Drop Forged Select Steel" forged into the reverse.

The overall length is 4.4 inches, and the finish is plain steel.


Indestro "Chicago" 5/8x11/16 Short Box-End Wrench

[Indestro Chicago 5/8x11/16 Box-End Wrench]
Fig. 103. Indestro "Chicago" 5/8x11/16 Box-End Wrench, with Insets for Side View and Reverse Detail.

Fig. 103 shows an Indestro "Chicago" 5/8x11/16 box-end wrench, marked with "Indestro" and "Chicago - U.S.A." forged into the streamlined depressed panel, with "Drop Forged Alloy Steel" forged into the reverse.

The overall length is 6.2 inches, and the finish is nickel plating.


Indestro Chicago 13/16x7/8 Short Box-End Wrench

[Indestro Chicago 13/16x7/8 Box-End Wrench]
Fig. 104. Indestro Chicago 13/16x7/8 Box-End Wrench, with Insets for Side View and Reverse Detail.

Fig. 104 at the left shows an Indestro 13/16x7/8 box-end wrench, marked "Chicago - U.S.A." in the streamlined depressed panel, with "Drop Forged Alloy Steel" on the reverse.

The overall length is 8.3 inches, and the finish is nickel plating.


Indestro "Klip-Tite" 920-03K Wrench Set

Indestro offered its short box-end wrenches in various sets, typically held in a "Klip-Tite" metal holder with a thumbscrew to secure the wrenches. This next figure shows an example of a Klip-Tite wrench set.

[Indestro Klip-Tite 920-03K Wrench Set]
Fig. 105. Indestro "Klip-Tite" 920-03K Three-Piece Wrench Set, with Inset for Top View, ca. late 1930s.

Fig. 105 shows an Indestro "Klip-Tite" model 920-03K wrench set, consisting of three Indestro Chicago short box wrenches in a steel holder. The holder is stamped "Klip-Tite Set" with the 920-03K model number.

The wrench sizes are 1/4x5/16, 3/8x7/16, and 1/2x9/16. Each wrench is marked "Indestro Chicago - U.S.A." in the streamlined depressed panel, with "Drop Forged Alloy Steel" on the reverse.

The overall length is 5.3 inches. The finish is an interesting combination of nickel plating on the box ends, with cadmium plating on the shanks.


Indestro Chicago 5/8x3/4 Open-Box Wrench

One style of wrenches popular for automobile tool kits included both open and box ends, but with different sizes on each wrench. These were typically sold in sets secured by a bolt and wing nut, with the range of sizes spanning the most common nut sizes.

Indestro was one of the major producers of such wrenches, and other makers included Barcalo Manufacturing and the Auto-Kit Brand of J.P. Danielson.

[Indestro Chicago 5/8x3/4 Open-Box Wrench]
Fig. 106. Indestro Chicago 5/8x3/4 Open-Box Wrench, with Inset for Reverse Detail, ca. 1930-1936.

Fig. 106 at the left shows an early Indestro 5/8x7/8 open-box wrench, marked "Chicago - U.S.A." in the depressed panel, with "Drop Forged Alloy Steel" on the opposite side. The fractional sizes are also forged into small depressed panels, one within the face of the open end, and the other near the box end.

The overall length is 6.5 inches, and the finish is cadmium plating.

This wrench is interesting for its use of depressed panels in a triangular design, indicating production before the advent of the well-known streamlined panel design. (The streamlined panel design was trademarked in 1937.)


Indestro Chicago 3/4x7/8 Open-Box Wrench

[Indestro Chicago 3/4x7/8 Open-Box Wrench]
Fig. 107. Indestro Chicago 3/4x7/8 Open-Box Wrench, with Inset for Reverse Detail.

Fig. 107 shows an Indestro 3/4x7/8 open-box wrench, marked "Chicago - U.S.A." in the streamlined depressed panel, with "Drop Forged Select Steel" on the opposite side. The fractional sizes are also forged into small depressed panels, one within the face of the open end, and the other near the box end.

The overall length is 7.6 inches, and the finish is chrome plating.


The Rise of Alloy-Steel Tools

By 1931 (or earlier) Duro/Indestro had begun producing tools using chrome vanadium or other alloy steels. Indestro's alloy production was sold using a number of different brands, including Indestro-Chicago, Indestro Polygon, Chromium-Vanadium, Chrome Vanadium Steel (with a slanted font), Super-Quality, and finally Indestro Super. By contrast, Duro's production had relatively simpler markings with either the Duro-Chrome or Handy-Hex brand.


Open-End Wrenches

Duro/Indestro produced a full range of (double) open-end wrenches in industry-standard sizes, sometimes referred to as engineer's wrenches. These wrenches were assigned model numbers by adding 1000 to the corresponding industry-standard number, so for example a 19/32x11/16 No. 27 wrench became model 1027. (See our table of Industry-Standard Numbers for Open-End Wrenches for an explanation of this numbering system.)

The standard finish (from the early 1930s on) was chrome plating with polished faces, except that cadmium or plain finishes were typically used during the years 1942-1945.


[Indestro] "Chrome Vanadium Steel" 1721 5/16x3/8 Open-End Wrench

The next two figures show examples of the Indestro 1721 wrench, first under the generic "Chrome Vanadium Steel" brand, then under the "Super-Quality" brand.

[Indestro Chrome Vanadium Steel 1721 5/16x3/8 Open-End Wrench]
Fig. 108. [Indestro] "Chrome Vanadium Steel" 1721 5/16x3/8 Open-End Wrench, with Inset for Reverse, ca. Early to Mid 1930s.

Fig. 108 shows an Indestro "Chrome Vanadium Steel" 1721 5/16x3/8 open-end wrench, stamped with "Chrome Vanadium Steel" in a slanted font on one face, with the model number on the other face. The reverse faces are stamped with the fractional sizes, with "Forged in U.S.A." along a curved arc on the left face.

The overall length is 5.2 inches, and the finish is chrome plating.


Super-Quality 1721 5/16x3/8 Open-End Wrench

[Super-Quality 1721 5/16x3/8 Open-End Wrench]
Fig. 109. Super-Quality 1721 5/16x3/8 Open-End Wrench, with Inset for Reverse, ca. Late 1930s to Early 1940s.

Fig. 109 shows a Super-Quality 1721 5/16x3/8 open-end wrench, stamped with "SuperQuality" and the model number on one face, with "Chrome Vanadium Steel" in a slanted font on the other face. The reverse faces are stamped with the fractional sizes, with "Forged in U.S.A." along a curved arc on the left face.

The overall length is 5.2 inches, and the finish is chrome plating.


[Indestro] "Chrome Vanadium Steel" 1723 3/8x7/16 Open-End Wrench

[Indestro Chrome Vanadium Steel 1723 3/8x7/16 Open-End Wrench]
Fig. 110. [Indestro] "Chrome Vanadium Steel" 1723 3/8x7/16 Open-End Wrench, with Inset for Reverse, ca. Early to Mid 1930s.

Fig. 110 shows an Indestro "Chrome Vanadium Steel" 1723 3/8x7/16 open-end wrench, stamped with "Chrome Vanadium Steel" in a slanted font on one face, with the model number on the other face. The reverse faces are stamped with the fractional sizes, with "Forged in U.S.A." along a curved arc on the left face.

The overall length is 5.2 inches, and the finish is chrome plating.


Super-Quality 1727 9/16x5/8 Open-End Wrench

[Super-Quality 1727 9/16x5/8 Open-End Wrench]
Fig. 111. Super-Quality 1727 9/16x5/8 Open-End Wrench, with Inset for Reverse, ca. Late 1930s to Early 1940s.

Fig. 111 shows a Super-Quality 1727 9/16x5/8 open-end wrench, stamped with "Super-Quality" and the model number on one face, with "Chrome Vanadium Steel" in a slanted font on the other face. The reverse faces are stamped with the fractional sizes, with "Forged in U.S.A." along a curved arc on the left face.

The shank of this example is stamped with "Indestro Mfg. Corp." and "Chicago", a less common marking for tools with the Super-Quality brand.

The overall length is 7.2 inches. The finish is chrome plating, with losses due to wear and rust.


Super-Quality 1027 19/32x11/16 Open-End Wrench

[Super-Quality 1027 19/32x11/16 Open-End Wrench]
Fig. 112. Super-Quality 1027 19/32x11/16 Open-End Wrench, with Inset for Reverse, ca. Late 1930s to Early 1940s.

Fig. 112 shows a Super-Quality 1027 19/32x11/16 open-end wrench, stamped with "Super-Quality" and the model number on one face, with "Chrome Vanadium Steel" in a slanted font on the other face. The reverse faces are stamped with the fractional sizes, with "Forged in U.S.A." along a curved arc on the left face.

The overall length is 7.2 inches, and the finish is chrome plating.


Super-Quality 1731-A 3/4x7/8 Open-End Wrench

[Super-Quality 1731-A 3/4x7/8 Open-End Wrench]
Fig. 113. Super-Quality 1731-A 3/4x7/8 Open-End Wrench, with Inset for Reverse, ca. Late 1930s to Early 1940s.

Fig. 113 shows a Super-Quality 1731-A 3/4x7/8 open-end wrench, stamped with "Super-Quality" and the model number on one face, with "Chrome Vanadium Steel" in a slanted font on the other face. The reverse faces are stamped with the fractional sizes, with "Forged in U.S.A." along a curved arc on the left face.

The overall length is 9.3 inches, and the finish is chrome plating, with losses due to wear.


[Indestro] "Chrome Vanadium Steel" 1033 7/8x31/32 Open-End Wrench

[Indestro Chrome Vanadium Steel 1033 7/8x31/32 Open-End Wrench]
Fig. 114. [Indestro] "Chrome Vanadium Steel" 1033 7/8x31/32 Open-End Wrench, with Inset for Reverse, ca. Early to Mid 1930s.

Fig. 114 shows an early [Indestro] "Chrome Vanadium Steel" 1033 7/8x31/32 open-end wrench, stamped with "Chrome Vanadium Steel" in a slanted font on the one face, with the model number on the other end. The reverse faces are stamped with the fractional sizes, with "Forged in U.S.A." along a curved arc on the right face.

The overall length is 9.2 inches, and the finish is chrome plating, with extensive losses due to wear.


Duro-Chrome 1723 3/8x7/16 Open-End Wrench

[Duro-Chrome 1723 3/8x7/16 Open-End Wrench]
Fig. 115. Duro-Chrome 1723 3/8x7/16 Open-End Wrench, with Inset for Reverse Detail.

Fig. 115 shows a Duro-Chrome 1723 3/8x7/16 open-end wrench, stamped "Forged in U.S.A." in a curved arc on the reverse face.

The overall length is 5.0 inches, and the finish is chrome plating with polished faces.


Duro-Chrome 1027 19/32x11/16 Open-End Wrench

[Duro-Chrome 1027 19/32x11/16 Open-End Wrench]
Fig. 116. Duro-Chrome 1027 19/32x11/16 Open-End Wrench, with Inset for Reverse.

Fig. 116 shows a Duro-Chrome 1027 19/32x11/16 open-end wrench, stamped "Duro-Chrome" with "Forged in U.S.A." along a curved arc on one face, with the model number stamped on the other end.

The overall length is 7.1 inches, and the finish is chrome plating.


Duro-Chrome 1729 5/8x3/4 Open-End Wrench

[Duro-Chrome 1729 5/8x3/4 Open-End Wrench]
Fig. 117. Duro-Chrome 1729 5/8x3/4 Open-End Wrench.

Fig. 117 shows a Duro-Chrome 1729 5/8x3/4 open-end wrench, stamped "Duro-Chrome" with "Forged in U.S.A." along a curved arc on one face, with the model number stamped on the other end.

The overall length is 8.3 inches, and the finish is chrome plating.


Duro-Chrome 1033C 15/16x1 Open-End Wrench

[Duro-Chrome 1033C 15/16x1 Open-End Wrench]
Fig. 118. Duro-Chrome 1033C 15/16x1 Open-End Wrench, with Inset for Reverse.

Fig. 118 shows a Duro-Chrome 1033C 15/16x1 open-end wrench, stamped "Duro-Chrome" with "Forged in U.S.A." along a curved arc on one face, with the model number stamped on the other face, and with the fractional sizes on the reverse faces.

The overall length is 10.6 inches, and the finish is chrome plating.


Ignition Wrenches

Ignition wrenches are a specialized subset of open-end wrenches designed with small openings and thin heads. Duro offered ignition wrenches in two styles: an E6x series with different openings and different offset angles, and an 8x series with equal-sized openings but different offset angles. Wrenches in the E6x series were made in model number pairs, with the same sizes but opposite offset angles.

A review of the Duro catalogs shows that the E6x series wrenches were first offered sometime after 1935, with our first reference being the 1938 catalog. (The 1935 catalog listed wrenches of this design, but in a 176x model number series.) The 1938 catalog doesn't specify the finish of the wrenches, suggesting that the wrenches may have had a plain steel finish in the beginning.

The 8x series ignition wrenches were first offered in the mid 1940s, and the 1946 Duro catalog is our earliest reference.


Duro-Chrome E61 13/64x15/64 Ignition Wrench

[Duro-Chrome E61 13/64x15/64 Ignition Wrench]
Fig. 119. Duro-Chrome E61 13/64x15/64 Ignition Wrench, with Inset for Reverse, ca. Mid 1930s to 1940s.

Fig. 119 shows a Duro-Chrome E61 13/64x15/64 ignition wrench, stamped with "USA" (clipped) and "Duro-Chrome" along a curved arc on the face.

The overall length is 3.0 inches, and the finish is plain steel.

In this model the smaller opening is at the less offset end.


Duro-Chrome E65 9/32x5/16 Ignition Wrench

[Duro-Chrome E65 9/32x5/16 Ignition Wrench]
Fig. 120. Duro-Chrome E65 9/32x5/16 Ignition Wrench, with Inset for Reverse, ca. Mid 1930s to 1940s.

Fig. 120 shows a Duro-Chrome E65 9/32x5/16 ignition wrench, stamped "USA" with "Duro Chrome" along a curved arc on the face.

The overall length is 3.5 inches, and the finish is plain steel.

In this model the smaller opening is at the less offset end.


Duro-Chrome E67 11/32x3/8 Ignition Wrench

The next two figures show a matched pair of E67/E68 wrenches in the 11/32x3/8 size.

[Duro-Chrome E67 11/32x3/8 Ignition Wrench]
Fig. 121. Duro-Chrome E67 11/32x3/8 Ignition Wrench, with Inset for Reverse, ca. Mid 1930s to 1940s.

Fig. 121 shows a Duro-Chrome E67 11/32x3/8 ignition wrench, stamped "U.S.A." with "Duro-Chrome" in a curved arc on the face.

The overall length is 4.0 inches, and the finish is plain steel.

In this model the smaller opening is at the less offset end.


Duro-Chrome E68 11/32x3/8 Ignition Wrench

[Duro-Chrome E68 11/32x3/8 Ignition Wrench]
Fig. 122. Duro-Chrome E68 11/32x3/8 Ignition Wrench, with Inset for Reverse, ca. Mid 1930s to 1940s.

Fig. 122 shows a Duro-Chrome E68 11/32x3/8 ignition wrench, stamped "U.S.A." with "Duro-Chrome" in a curved arc on the face.

The overall length is 4.0 inches, and the finish is plain steel.

In this model the larger opening is at the less offset end.


Duro-Chrome E69 7/16x1/2 Ignition Wrench

[Duro-Chrome E69 7/16x1/2 Ignition Wrench]
Fig. 123. Duro-Chrome E69 7/16x1/2 Ignition Wrench, with Inset for Reverse, ca. Mid 1930s to 1940s.

Fig. 123 shows a Duro-Chrome E69 7/16x1/2 ignition wrench, stamped "U.S.A." with "Duro-Chrome" in a curved arc on the face.

The overall length is 4.5 inches, and the finish is plain steel.

In this model the smaller opening is at the less offset end. The E69 model was the largest of the E6x series, and for some reason Duro didn't make the matching wrench (i.e. with different offset angles) for this size.


Duro-Chrome 86 11/32x11/32 Ignition Wrench

[Duro-Chrome 86 11/32x11/32 Ignition Wrench]
Fig. 124. Duro-Chrome 86 11/32x11/32 Ignition Wrench, with Inset for Reverse, Mid 1940s+.

Fig. 124 shows a Duro-Chrome 86 11/32x11/32 ignition wrench, stamped "U.S.A." with "Duro-Chrome" in a curved arc on the face.

The overall length is 3.9 inches, and the finish is plain steel.


Duro-Chrome 88 7/16x7/16 Ignition Wrench

[Duro-Chrome 88 7/16x7/16 Ignition Wrench]
Fig. 125. Duro-Chrome 88 7/16x7/16 Ignition Wrench, Mid 1940s+.

Fig. 125 shows a Duro-Chrome 88 7/16x7/16 ignition wrench, stamped "U.S.A." with "Duro-Chrome" in a curved arc on the face.

The overall length is 4.5 inches, and the finish is plain steel.


Tappet Wrenches


Indestro Super T1A 7/16x1/2 Tappet Wrench

[Indestro Super T1A 7/16x1/2 Tappet Wrench]
Fig. 126. Indestro Super T1A 7/16x1/2 Tappet Wrench, with Inset for Reverse, ca. 1945+.

Fig. 126 shows an Indestro Super T1A 7/16x1/2 tappet wrench, stamped with "Indestro Super" and the model number on the front faces. The reverse faces are stamped with the fractional sizes, with "Forged in U.S.A." in a curved arc on the left face.

The overall length is 7.4 inches, and the finish is chrome plating.


Indestro Super [T-]1 7/16x17/32 Tappet Wrench

[Indestro Super T-1 7/16x17/32 Tappet Wrench]
Fig. 127. Indestro Super T-1 7/16x17/32 Tappet Wrench, with Inset for Reverse, ca. 1945+.

Fig. 127 shows an Indestro Super [T-]1 7/16x17/32 tappet wrench, stamped with "Indestro Super" and the model number on the front faces. The reverse faces are stamped with the fractional sizes, with "Forged in U.S.A." in a curved arc on the left face.

The overall length is 7.3 inches, and the finish is chrome plating.


Indestro "Chrome Vanadium Steel" [T-]3 5/8x11/16 Tappet Wrench

[Indestro Chrome Vanadium Steel No. 3 5/8x11/16 Tappet Wrench]
Fig. 128. Indestro "Chrome Vanadium Steel" [T-]3 5/8x11/16 Tappet Wrench, with Inset for Reverse, ca. 1930s to Early 1940s.

Fig. 128 shows an [Indestro] "Chrome Vanadium Steel" [T-]3 5/8x11/16 tappet wrench, stamped with "Chrome Vanadium Steel" in a slanted font on one face, with the model number on the other face. The reverse faces are stamped with the fractional sizes, with "Forged in U.S.A." in a curved arc on the left face.

The overall length is 8.6 inches, and the finish is plain steel.


Duro-Chrome D-1 7/16x17/32 Tappet Wrench

[Duro-Chrome D-1 7/16x17/32 Tappet Wrench]
Fig. 129. Duro-Chrome D-1 7/16x17/32 Tappet Wrench.

Fig. 129 shows a Duro-Chrome D-1 7/16x17/32 tappet wrench, stamped "Forged in U.S.A." in a curved arc.

The overall length is 8.0 inches, and the finish is chrome plating with polished faces.


Duro-Chrome D-2 1/2x9/16 Tappet Wrench

[Duro-Chrome D-2 1/2x9/16 Tappet Wrench]
Fig. 130. Duro-Chrome D-2 1/2x9/16 Tappet Wrench, with Inset for Reverse Detail.

Fig. 130 shows a Duro-Chrome D-2 1/2x9/16 tappet wrench, stamped "Forged in U.S.A." in a curved arc.

The overall length is 8.2 inches, and the finish is chrome plating with polished faces.


Duro-Chrome D-3 5/8x11/16 Tappet Wrench

[Duro-Chrome D-3 5/8x11/16 Tappet Wrench]
Fig. 131. Duro-Chrome D-3 5/8x11/16 Tappet Wrench, with Inset for Reverse.

Fig. 131 shows a Duro-Chrome D-3 5/8x11/16 tappet wrench, stamped "Duro-Chrome" with "Forged in U.S.A." in a curved arc on the left face, with the model number on the right face, and with the fractional sizes on the reverse faces.

The overall length is 9.0 inches. The original finish was chrome plating, but most has been lost due to extensive rust.


Duro-Chrome LDT-22 11/16 Long Tappet Wrench

Duro also offered an LDT series of long single-ended tappet wrenches, as illustrated in the next figure.

[Duro-Chrome LDT-22 11/16 Long Tappet Wrench]
Fig. 132. Duro-Chrome LDT-22 11/16 Long Tappet Wrench, with Inset for Reverse.

Fig. 132 shows a Duro-Chrome LDT-22 11/16 tappet wrench, stamped "Duro-Chrome" with "Forged in U.S.A." in a curved arc on the face, with the model number and fractional size on the reverse.

The overall length is 12.3 inches, and the finish is nickel plating.


Obstruction Wrenches

By the early to mid 1930s Duro and Indestro were offering obstruction wrenches with an interesting design, using equal openings with one 90 degree offset and one 65 degree offset. This wrench design is believed to have originated with Herbrand, as by 1931 Herbrand was supplying obstruction wrenches of this style to Western Auto Supply. Duro's obstruction wrenches are almost identical to the Herbrand counterparts -- even down to the model number -- suggesting that Duro was trying to win the Western Auto business. (Duro and Indestro were fiercely competitive in the high-volume low-cost market.)

Our earliest catalog reference for these wrenches is the 1935 Duro Metal Products catalog. It lists obstruction wrenches in seven models, 1821 (3/8), 1823 (7/16), 1825 (1/2), 1827 (9/16), 1829 (5/8), 1830 (11/16), and 1831 (3/4). A set of the seven wrenches in a leatherette roll was available as the No. 18007 set with a $7.30 list price.


Duro-Chrome 1821 3/8x3/8 Obstruction Wrench

[Duro-Chrome 1821 3/8x3/8 Obstruction Wrench]
Fig. 133. Duro-Chrome 1821 3/8x3/8 Obstruction Wrench, ca. 1942-1945.

Fig. 133 shows a Duro-Chrome 1821 3/8x3/8 obstruction wrench, stamped "Duro-Chrome" and "Forged in U.S.A." on the face.

The overall length is 5.5 inches, and the finish is plain steel.


Duro-Chrome 1823 7/16x7/16 Obstruction Wrench

[Duro-Chrome 1823 7/16x7/16 Obstruction Wrench]
Fig. 134. Duro-Chrome 1823 7/16x7/16 Obstruction Wrench, with Inset for Reverse.

Fig. 134 shows a Duro-Chrome 1823 7/16x7/16 obstruction wrench, stamped "Duro-Chrome" and "Forged in U.S.A." on the face.

The overall length is 5.5 inches. The finish on this wrench is somewhat unusual, with what appears to be polished nickel on the faces and zinc or cadmium on the shank.


Duro-Chrome 1825 1/2x1/2 Obstruction Wrench

[Duro-Chrome 1825 1/2x1/2 Obstruction Wrench]
Fig. 135. Duro-Chrome 1825 1/2x1/2 Obstruction Wrench, with Inset for Reverse.

Fig. 135 shows a Duro-Chrome 1825 1/2x1/2 obstruction wrench, stamped "Duro-Chrome" and "Forged in U.S.A." on the face.

The overall length is 6.5 inches, and the finish is nickel plating.


Duro-Chrome 1827 9/16x9/16 Obstruction Wrench

[Duro-Chrome 1827 9/16x9/16 Obstruction Wrench]
Fig. 136. Duro-Chrome 1827 9/16x9/16 Obstruction Wrench, with Inset for Reverse.

Fig. 136 shows a Duro-Chrome 1827 9/16x9/16 obstruction wrench, stamped "Duro-Chrome" and "Forged in U.S.A" on the face.

The overall length is 6.5 inches, and the finish is chrome plating, with some losses due to wear.


Super-Quality 1827 9/16x9/16 Obstruction Wrenches

The next figures show two examples of the Super-Quality 1827 obstruction wrench, including one with an uncommon "Indestro" marking.

[Super-Quality 1827 9/16x9/16 Obstruction Wrench]
Fig. 137. Super-Quality 1827 9/16x9/16 Obstruction Wrench, with Inset for Reverse Detail.

Fig. 137 shows a Super-Quality 1827 9/16x9/16 obstruction wrench, stamped "Indestro Mfg. Corp. Chicago" on the shank. One face is stamped with "Super Quality" and the model number, with "Chrome Vanadium Steel" in a slanted font on the other end, and with "Forged in U.S.A." on the reverse.

The overall length is 6.5 inches, and the finish is nickel plating with polished faces.

[Super-Quality 1827 9/16x9/16 Obstruction Wrench]
Fig. 138. Super-Quality 1827 9/16x9/16 Obstruction Wrench, with Inset for Reverse Detail.

Fig. 138 shows a similar Super-Quality 1827 9/16x9/16 obstruction wrench, but without the Indestro marking. One face is stamped with "Super Quality" and the model number, with "Chrome Vanadium Steel" in a slanted font on the other end, and with "Forged in U.S.A." on the reverse.

The overall length is 6.5 inches, and the finish is nickel plating with polished faces.


Duro-Chrome 1830 11/16x11/16 Obstruction Wrench

[Duro-Chrome 1830 11/16x11/16 Obstruction Wrench]
Fig. 139. Duro-Chrome 1830 11/16x11/16 Obstruction Wrench.

Fig. 139 shows a Duro-Chrome 1830 11/16x11/16 obstruction wrench, stamped "Forged in U.S.A." in a curved arc on the face.

The overall length is 7.4 inches, and the finish is chrome plating.


Duro-Chrome 1831 3/4x3/4 Obstruction Wrench

[Duro-Chrome 1831 3/4x3/4 Obstruction Wrench]
Fig. 140. Duro-Chrome 1831 3/4x3/4 Obstruction Wrench, with Inset for Reverse.

Fig. 140 shows a Duro-Chrome 1831 3/4x3/4 obstruction wrench, stamped "Forged in U.S.A." in a curved arc on the face.

The overall length is 7.4 inches, and the finish is chrome plating.


Indestro Box-End Wrenches

The first box-end wrenches produced by Duro/Indestro were probably the Indestro Polygon series, believed to have been developed around 1932 for sale by Western Auto Supply. The wrench design is a virtual copy of the Herbrand "MultiHex" offset box wrenches, which were being sold by Western Auto as early as 1931. In 1932 a competing "Perfection" brand was offered, at a substantially lower price, and these are believed to be the Indestro Polygon tools as marked for Western Auto.

In keeping with the standard markings used by Western Auto Supply in the early 1930s, the Indestro Polygon wrenches are marked "Chromium-Vanadium", using the full names of the metallic elements.

After the initial Indestro Polygon series, Indestro rapidly expanded its (double) box-end wrenches into four basic styles with a wide range of sizes. These were offered under the Indestro Chicago and Super-Quality brand, the latter being optionally marked with the company name.

Unlike the case with open-end wrenches, box wrenches were not given model numbers derived from industry-standard numbers. The box wrenches instead received ad hoc model numbers, and with different numbers for the Indestro and Duro brands.


Offset Box-End Wrenches

We'll begin with offset box-end wrenches, as these were likely the first models to be produced.


Indestro "Polygon" 1/2x9/16 Offset Box-End Wrench

The next four figures show the evolution of Indestro's 1/2x9/16 offset box wrench through several generations of production and branding.

[Indestro Polygon 1/2x9/16 Offset Box-End Wrench]
Fig. 141. Indestro "Polygon" 1/2x9/16 Offset Box-End Wrench, with Insets for Side View and Reverse Detail, ca. Early to Mid 1930s.

Fig. 141 shows an early Indestro "Polygon" 1/2x9/16 offset box wrench, stamped with "Indestro Polygon" on the shank, with "Chromium-Vanadium" and the fractional sizes on the reverse.

The overall length is 8.5 inches, and the finish is nickel plating.


Indestro Chicago No. 731 1/2x9/16 Offset Box-End Wrench

Some of Indestro's early alloy-steel production was marked with "Indestro-Chicago" rather than the Polygon or Chromium-Vanadium brands.

[Indestro Chicago 731 1/2x9/16 Offset Box-End Wrench]
Fig. 142. Indestro "Chicago" 731 1/2x9/16 Offset Box-End Wrench, with Insets for Side View and Reverse Detail, ca. Early to Mid 1930s.

Fig. 142 shows an early Indestro "Chicago" 731 1/2x9/16 offset box wrench, stamped "Indestro-Chicago, U.S.A." on the shank, with "Chrome-Vanadium-Steel" on the reverse.

The overall length is 8.9 inches, and the finish is plain steel.

Note that this early wrench does not employ the slanted font for the "Chrome Vanadium Steel" marking, a characteristic found on later Indestro production.


Super-Quality 731 1/2x9/16 Offset Box-End Wrench

The next two figures show examples of the Super-Quality 731 wrench, with differences noted in construction and markings.

[Super-Quality 731 1/2x9/16 Offset Box Wrench]
Fig. 143A. Super-Quality 731 1/2x9/16 Offset Box Wrench, with Insets for Side View and Reverse Detail, ca. Mid 1930s to 1937.

Fig. 143A shows a Super-Quality 731 1/2x9/16 offset box wrench, stamped "Super-Quality" and "Made in U.S.A." on the shank, with "Chrome Vanadium Steel" and the fractional sizes on the reverse.

The overall length is 8.4 inches, and the finish is nickel plating, with losses due to wear.

This wrench has a hexagonal shank without the streamlined panels used on later Indestro production, suggesting a manufacturing date in the mid 1930s.

[Indestro Super-Quality 731 1/2x9/16 Offset Box Wrench]
Fig. 143B. Indestro Super-Quality 731 1/2x9/16 Offset Box Wrench, with Insets for Side View and Reverse Detail, ca. 1937 to Early 1940s.

Fig. 143B shows a somewhat later Indestro Super-Quality 731 1/2x9/16 offset box wrench with raised streamlined panels, stamped with the fractional sizes and "Chrome Vanadium Steel" in a slanted font on the front panel, with the model number and "Indestro U.S.A." plus "Super-Quality" on the reverse panel (lower inset).

The overall length is 8.4 inches, and the finish is nickel plating, with losses due to rust and pitting.

The streamlined panels indicate production in 1937 or later, and the nickel finish suggests pre-war production.


Indestro "Polygon" 5/8x11/16 Offset Box-End Wrench

[Indestro Polygon 5/8x11/16 Offset Box-End Wrench]
Fig. 144. Indestro "Polygon" 5/8x11/16 Offset Box-End Wrench, with Insets for Side View and Reverse Detail, ca. Early to Mid 1930s.

Fig. 144 shows an early Indestro "Polygon" 5/8x11/16 offset box wrench, stamped with "Chromium-Vanadium" and the fractional sizes on the shank, with "Indestro Polygon" on the reverse.

The overall length is 9.8 inches, and the finish is nickel plating.


Indestro Chicago 733 3/4x25/32 Offset Box-End Wrench

The next two figures show examples of the Indestro model 733 wrench, but with different brand markings.

[Indestro Chicago 733 3/4x25/32 Offset Box-End Wrench]
Fig. 145. Indestro Chicago 733 3/4x25/32 Offset Box-End Wrench, with Insets for Side View and Reverse Detail, ca. Early to Mid 1930s.

Fig. 145 shows an early Indestro "Chicago" 733 3/4x25/32 offset box wrench, marked "Indestro-Chicago, U.S.A." with "Chrome-Vanadium-Steel" on the reverse.

The overall length is 11.1 inches. The finish is nickel plating with polished ends. Note that the left end of the wrench is extensively pitted, apparently from contact with battery acid or some other corrosive substance.


Super-Quality 733 3/4x25/32 Offset Box-End Wrench

[Super-Quality 733 3/4x25/32 Offset Box-End Wrench]
Fig. 145B. Super-Quality 733 3/4x25/32 Offset Box-End Wrench, with Insets for Side View and Reverse Detail, ca. Mid 1930s to 1937.

Fig. 145B shows a slightly later [Indestro] Super-Quality 733 3/4x25/32 offset box wrench, stamped "Super-Quality" and "Made in USA" with the model number on the shank, with the fractional sizes and "Chrome Vanadium Steel" in a slanted font on the reverse.

The overall length is 11.2 inches, and the finish is plain steel, with traces of chrome or nickel plating.

The absence of the streamlined panels used on later Indestro wrenches suggests production in 1937 or earlier. A later example of this model can be seen as the Super-Quality (X-Circle) [733] Offset Box Wrench.


Super-Quality 758A 1-3/16x1-1/4 Offset Box Wrench

Our next figure shows one of the larger examples of the Super-Quality brand, and in an unusual size as well.

[Super-Quality 758A 1-3/16x1-1/4 Offset Box Wrench]
Fig. 146. Super-Quality 758A 1-3/16x1-1/4 Offset Box Wrench, with Insets for Side View and Reverse Detail, ca. Late 1930s to Early 1940s.

Fig. 146 shows a Super-Quality 758A 1-3/16x1-1/4 offset box wrench, marked "Forged in U.S.A." on the streamlined raised panel, with the fractional sizes and "Chrome Vanadium Steel" on the reverse panel.

The overall length is 18.2 inches, and the finish is chrome plating with polished faces.


Short Offset Box-End Wrenches


Indestro Super-Quality 741 3/8x7/16 Short Offset Box-End Wrench

[Indestro Super-Quality 741 3/8x7/16 Short Offset Box Wrench]
Fig. 147. Indestro Super-Quality 741 3/8x7/16 Short Offset Box Wrench, with Insets for Side View and Reverse Detail, ca. 1937 to Early 1940s.

Fig. 147 shows an Indestro Super-Quality 741 3/8x7/16 short offset box wrench with streamlined panels, stamped "Indestro U.S.A." and "Super-Quality" on the front panel, and with "Chrome Vanadium Steel" and the fractional sizes on the reverse panel.

The overall length is 4.8 inches, and the finish is chrome plating.


Angled Box-End Wrenches


Indestro Super-Quality 713 9/16x5/8 Box-End Wrench

The Super-Quality brand was the forerunner of the Indestro Super line, and was in use from the 1930s up through about 1945. As the term implies, the Super-Quality mark was used for the Indestro's higher-end line of chrome-alloy tools.

Most of the tool models in the Super-Quality line retained the same model number after the change to the Indestro Super brand, so in most cases we have indexed the tool examples under both marks.

[Indestro Super-Quality 713 9/16x5/8 Box Wrench]
Fig. 148. Super-Quality 713 9/16x5/8 Box Wrench, with Insets for Side View and Reverse Detail, ca. 1937 to Early 1940s.

Fig. 148 shows an Indestro Super-Quality 713 9/16x5/8 box wrench with streamlined panels, stamped with "Super-Quality" and "Indestro U.S.A." on the front panel, with the fractional sizes and "Chrome Vanadium Steel" in a slanted font on the reverse panel.

The overall length is 9.0 inches, and the finish is chrome plating.

The Duro-Chrome equivalent of this model can be seen as the Duro-Chrome 2013 Box Wrench.


Short Angled Box-End Wrenches


Super-Quality 753 5/8x11/16 Short Box-End Wrench

[Super-Quality 753 5/8x11/16 Short Box-End Wrench]
Fig. 149. Super-Quality 753 5/8x11/16 Short Box-End Wrench, with Insets for Side View and Reverse Detail, ca. 1942-1943.

Fig. 149 shows a Super-Quality 753 5/8x11/16 short box-end wrench with streamlined panels, stamped with the model and brand on the front panel, and with "Forged in U.S.A." and the fractional sizes on the reverse.

The overall length is 5.1 inches, and the finish is plain steel with polished faces and ends.

The plain finish and lack of an alloy steel marking suggest production during the wartime years, and the use of the standard model number without the X-Circle marking suggests the earlier 1942-1943 period.


Duro Box-End Wrenches

Duro's box-end wrenches developed around the same time as the Indestro models but were sold through different channels. The primary brands used were Handy-Hex and Duro-Chrome.

As with the Indestro box wrenches, the Duro brands were available in four basic styles with a wide range of sizes. And once again, the box wrenches received ad hoc model numbers, not derived from industry-standard numbers, and not matching the Indestro models.

The Handy-Hex brand was Duro's vehicle for contract production or generic branding. Tools marked as Handy-Hex frequently have model numbers matching the Duro-Chrome part, but with a leading "0" added. (Sometimes the "0" was hand-stamped.)


Offset Box-End Wrenches


Handy-Hex 02051 3/8x7/16 Offset Box-End Wrench

[Handy-Hex 02051 3/8x7/16 Offset Box-End Wrench
Fig. 150. Handy-Hex 02051 3/8x7/16 Offset Box-End Wrench, with Insets for Side and Reverse Detail, ca. 1930s.

Fig. 150 shows a Handy-Hex 02051 3/8x7/16 offset box-end wrench, stamped with "Chrome Vanadium Steel" and the fractional sizes on the shank, with "Handy-Hex" and "Made in U.S.A." on the reverse.

The overall length is 7.8 inches, and the finish appears to be nickel plating.

The top inset shows a side view of the wrench, illustrating the deep offset profile of this design.


Handy-Hex 02052 1/2x9/16 Offset Box-End Wrench

[Handy-Hex 02052 1/2x9/16 Offset Box-End Wrench
Fig. 151. Handy-Hex 02052 1/2x9/16 Offset Box-End Wrench, with Insets for Side and Reverse Detail, ca. 1930s.

Fig. 151 shows a Handy-Hex 02052 1/2x9/16 offset box-end wrench, stamped with "Chrome Vanadium Steel" and the fractional sizes on the shank, with "Handy-Hex" and "Made in U.S.A." on the reverse.

The overall length is 8.8 inches. The finish is plain steel, with possible traces of a plated finish.

The top inset shows a side view of the wrench, illustrating the deep offset profile of this design.


Duro-Chrome 2052A 9/16x5/8 Offset Box Wrench

[Duro-Chrome 2052A 9/16x5/8 Offset Box Wrench]
Fig. 152. Duro-Chrome 2052A 9/16x5/8 Offset Box Wrench, with Insets for Side View and Reverse Detail, ca. 1946 to 1960s.

Fig. 152 shows a later Duro-Chrome 2052A 9/16x5/8 offset box wrench with streamlined raised panels, stamped with "Duro-Chrome" and the model number on the front panel, with "Forged in U.S.A." and the fractional sizes on the reverse panel.

The overall length is 9.5 inches, and the finish is chrome plating.

The lack of an alloy steel specification indicates a post-war production date for this example.


Handy-Hex 02053 5/8x11/16 Offset Box-End Wrench

[Handy-Hex 02053 5/8x11/16 Offset Box-End Wrench
Fig. 153. Handy-Hex 02053 5/8x11/16 Offset Box-End Wrench, with Insets for Side and Reverse Detail ca. Early to Mid 1930s.

Fig. 153 shows a Handy-Hex 02053 5/8x11/16 offset box-end wrench, stamped with the fractional sizes and "Chrome Vanadium Steel" on one side, with "Handy-Hex" and "Made in U.S.A." on the reverse.

The overall length is 9.9 inches. The finish appears to be cadmium plating, with some losses due to wear and corrosion.

The top inset shows a side view of the wrench, illustrating the deep offset profile of this design.


Handy-Hex 02054/Duro-Chrome 2054 3/4x25/32 Offset Box-End Wrenches

The next several figures show two examples of the Handy-Hex 02054 wrench, with minor differences in the finish, followed by the Duro-Chrome equivalent model 2054 wrench.

[Handy-Hex 02054 3/4x25/32 Offset Box-End Wrench
Fig. 154. Handy-Hex 02054 3/4x25/32 Offset Box-End Wrench, with Insets for Side and Reverse Detail, ca. 1930s.

Fig. 154 shows a Handy-Hex 02054 3/4x25/32 offset box-end wrench, marked "Made in U.S.A." with "Chrome Vanadium Steel" on the reverse.

The overall length is 11.3 inches.

The finish is plain steel, possibly indicating that this is an early example of the series.

The top inset shows a side view of the wrench, illustrating the deep offset profile of this design.

[Handy-Hex 02054 3/4x25/32 Offset Box-End Wrench
Fig. 155. Handy-Hex 02054 3/4x25/32 Offset Box-End Wrench, with Insets for Side and Reverse Detail, ca. 1930s.

Fig. 155 shows a Handy-Hex 02054 3/4x25/32 offset box-end wrench, stamped with "Chrome Vanadium Steel" and the fractional sizes on the shank, with "Handy-Hex" and "Made in U.S.A." on the reverse.

The overall length is 11.3 inches. The finish appears to be cadmium plating on the shank with polished nickel on the box ends.

The top inset shows a side view of the wrench, illustrating the deep offset profile of this design.

Duro-Chrome 2054 3/4x25/32 Offset Box Wrench

[Duro-Chrome 2054 3/4x25/32 Offset Box Wrench]
Fig. 156. Duro-Chrome 2054 3/4x25/32 Offset Box Wrench, with Insets for Side View and Reverse Detail, ca. Late 1930s to Early 1940s.

Fig. 156 shows a Duro-Chrome 2054 3/4x25/32 offset box wrench with streamlined raised panels, stamped "Duro-Chrome" and "Forged in U.S.A." on the front panel, with "Chrome Vanadium Steel" and the fractional sizes on the reverse.

The overall length is 11.3 inches, and the finish is chrome plating.

An earlier version of this model can be seen as the Handy-Hex 02054 Offset Box Wrench.


Duro-Chrome 2055 13/16x7/8 Offset Box Wrench

[Duro-Chrome 2055 13/16x7/8 Offset Box Wrench]
Fig. 157. Duro-Chrome 2055 13/16x7/8 Offset Box Wrench, with Insets for Side View and Reverse Detail, ca. 1946+.

Fig. 157 shows a Duro-Chrome 2055 13/16x7/8 offset box wrench with streamlined raised panels, stamped with "Duro-Chrome" and the fractional sizes on the front panel, with "Forged in U.S.A." and the model number on the reverse.

The overall length is 12.8 inches, and the finish is chrome plating.


Handy-Hex 02056 15/16x1 Offset Box-End Wrench

[Handy-Hex 02056 15/16x1 Offset Box-End Wrench
Fig. 158. Handy-Hex 02056 15/16x1 Offset Box-End Wrench, with Insets for Side and Reverse Detail, ca. 1930s.

Fig. 158 shows a Handy-Hex 02056 15/16x1 offset box-end wrench, stamped with "Chrome Vanadium Steel" and the fractional sizes on the shank, with "Handy-Hex" and "Made in U.S.A." on the reverse.

The overall length is 14.4 inches, and the finish is chrome plating, with some losses due to rust.

The top inset shows a side view of the wrench, illustrating the deep offset profile of this design.


Duro-Chrome "Handy-Hex" 2059A 1-5/16x1-3/8 Offset Box Wrench

[Duro-Chrome Handy-Hex 2059A 1-5/16x1-3/8 Offset Box Wrench]
Fig. 159. Duro-Chrome "Handy-Hex" 2059A 1-5/16x1-3/8 Offset Box Wrench, with Insets for Side View and Reverse Detail, ca. Late 1930s.

Fig. 159 shows one of the larger Duro-Chrome box wrenches, a Duro-Chrome 2059A 1-5/16x1-3/8 offset box wrench with streamlined raised panels. The wrench is dual-marked with "Duro-Chrome" and "Handy-Hex" stamped on the front panel, with "Chrome Vanadium Steel" and the fractional sizes on the reverse.

The overall length is 20.3 inches. The original finish was chrome plating, but most has been lost due to rust.


Short Offset Box-End Wrenches

Duro-Chrome offered short box wrenches in both offset and angled (15 degree) configurations, with five size combinations for each of the 204x offset series and 206x angled series. The sizes ranged from 3/8x7/16 (model 2041/2061) up to 3/4x25/32 (model 2044/2064).


Duro-Chrome 2042 1/2x9/16 Short Offset Box Wrenches

The next figures show two generations of the 2042 short offset box wrench.

[Duro-Chrome 2042 1/2x9/16 Short Offset Box Wrench]
Fig. 160. Duro-Chrome 2042 1/2x9/16 Short Offset Box Wrench, with Insets for Side View and Reverse Detail, ca. Late 1930s to Early 1940s.

Fig. 160 shows an earlier Duro-Chrome 2042 1/2x9/16 short offset box wrench, stamped with "Chrome Vanadium Steel" and the fractional sizes on the streamlined raised panel. The reverse panel is stamped with the "2042" model number between "Duro-Chrome" and "Forged in U.S.A.", but is difficult to read due to pitting.

The overall length is 5.6 inches. The finish is plain steel with extensive pitting due to rust, possibly with traces of a prior plated finish.

[Duro-Chrome 2042 1/2x9/16 Short Offset Box Wrench]
Fig. 161. Duro-Chrome 2042 1/2x9/16 Short Offset Box Wrench, with Insets for Side View and Reverse Detail, 1945.

Fig. 161 shows a later Duro-Chrome 2042 1/2x9/16 short offset box wrench, marked with the model number and brand on the streamlined raised panel, with "Forged in U.S.A." and the fractional sizes on the reverse. Note also that a "G" code is stamped in front of the model number.

The overall length is 5.2 inches, and the finish is black oxide.

The black oxide finish would suggest a manufacturing date during 1942-1945, but the "G" code stamped on the panel indicates a more precise 1945 date. The "G" code indicates manufacture in 1945 under restrictive government regulations, and can be found occasionally on tools of this era. (The use of the "G" date code by Snap-On is well documented.)


Duro-Chrome 2043 5/8x11/16 Short Offset Box Wrench

[Duro-Chrome 2043 5/8x11/16 Short Offset Box Wrench]
Fig. 162. Duro-Chrome 2043 5/8x11/16 Short Offset Box Wrench, with Insets for Side View and Reverse Detail, ca. 1946 to 1960s.

Fig. 162 shows a Duro-Chrome 2043 5/8x11/16 short offset box wrench with raised streamlined panels, stamped with "Duro Chrome" and the fractional sizes on the front panel, with the model number and "Forged in U.S.A." on the reverse panel.

The overall length is 6.3 inches, and the finish is chrome plating with polished faces.

The lack of an alloy steel specification indicates a post-war production date for this example.


Duro-Chrome 2044 3/4x25/32 Short Offset Box Wrench

[Duro-Chrome 2044 3/4x25/32 Short Offset Box Wrench]
Fig. 163. Duro-Chrome 2044 3/4x25/32 Short Offset Box Wrench, with Insets for Side View and Reverse Detail, ca. 1937 to Early 1940s.

Fig. 163 shows a Duro-Chrome 2044 3/4x25/32 short offset box wrench with raised streamlined panels, stamped with "Chrome Vanadium Steel" and the fractional sizes on the front panel, with "Duro Chrome" and "Forged in U.S.A." on the reverse panel.

The overall length is 7.0 inches, and the finish is chrome plating, with some losses due to rust.


Angled Box-End Wrenches


Duro-Chrome 2013 9/16x5/8 Box-End Wrench

[Duro-Chrome 2013 9/16x5/8 Box-End Wrench]
Fig. 164. Duro-Chrome 2013 9/16x5/8 Box-End Wrench, with Insets for Side View and Reverse Detail, ca. Late 1930s to Early 1940s.

Fig. 164 shows a Duro-Chrome 2013 9/16x5/8 box-end wrench with streamlined raised panels, stamped "Duro-Chrome" and "Forged in U.S.A." on the front panel, with "Chrome Vanadium Steel" on the reverse.

The overall length is 9.0 inches, and the finish is chrome plating with polished ends.

The Indestro equivalent of this model can be seen as the Super-Quality 713 Box Wrench.


Duro-Chrome 2014 11/16x25/32 Box-End Wrench

[Duro-Chrome 2014 11/16x25/32 Box-End Wrench]
Fig. 165. Duro-Chrome 2014 11/16x25/32 Box-End Wrench, with Insets for Side View and Reverse Detail, ca. Late 1930s to Early 1940s.

Fig. 165 shows a Duro-Chrome 2014 11/16x25/32 box-end wrench with streamlined raised panels, stamped "Duro-Chrome" and "Forged in U.S.A." on the front panel, with "Chrome Vanadium Steel" and the fractional sizes on the reverse.

The overall length is 10.1 inches, and the finish is chrome plating with polished ends.


Duro-Chrome 2015 3/4x7/8 Box-End Wrench

[Duro-Chrome 2015 3/4x7/8 Box-End Wrench]
Fig. 166. Duro-Chrome 2015 3/4x7/8 Box-End Wrench, with Insets for Side View and Reverse Detail, ca. 1942-1943.

Fig. 166 shows a Duro-Chrome 2015 3/4x7/8 box-end wrench with raised parallelogram panels, stamped "Duro-Chrome" and "Forged in U.S.A." on the front panel, with "Chrome Vanadium Steel" and the fractional sizes on the reverse panel.

The overall length is 11.1 inches, and the finish is plain steel.


Duro-Chrome 2017 1-1/16x1-1/8 Box-End Wrench

[Duro-Chrome 2017 1-1/16x1-1/8 Box-End Wrench]
Fig. 167. Duro-Chrome 2017 1-1/16x1-1/8 Box-End Wrench, with Insets for Side View and Reverse Detail, ca. Late 1930s to Early 1940s.

Fig. 167 shows a Duro-Chrome 2017 1-1/16x1-1/8 box-end wrench with streamlined panels, stamped "Duro-Chrome" and "Forged in U.S.A." on the raised panel, with "Chrome Vanadium Steel" and the fractional sizes on the reverse.

The overall length is 17.7 inches, and the finish is plain steel.


Short Angled Box-End Wrenches

Duro-Chrome offered short box wrenches in both offset and angled (15 degree) configurations, with five size combinations for each of the 204x offset series and 206x angled series. The sizes ranged from 3/8x7/16 (model 2041/2061) up to 3/4x25/32 (model 2044/2064).


Duro-Chrome 2021 1/4x5/16 Short Box Wrench

[Duro-Chrome 2021 1/4x5/16 Short Box Wrench]
Fig. 168. Duro-Chrome 2021 1/4x5/16 Short Box Wrench, with Insets for Side View and Reverse Detail, ca. 1946 to 1960s.

Fig. 168 shows a Duro-Chrome 2021 1/4x5/16 box wrench, marked "Duro-Chrome" on the streamlined raised panel, with "Forged in U.S.A." on the reverse.

The overall length is 3.8 inches, and the finish is chrome plating.


Duro-Chrome 2061 3/8x7/16 Short Box Wrench

[Duro-Chrome 2061 3/8x7/16 Short Box Wrench]
Fig. 169. Duro-Chrome 2061 3/8x7/16 Short Box Wrench, with Inset for Reverse Detail.

Fig. 169 shows a Duro-Chrome 2061 3/8x7/16 box wrench, stamped "Duro-Chrome" on the streamlined raised panel, with "Forged in U.S.A." on the reverse.

The overall length is 4.1 inches, and the finish is chrome plating.


Duro-Chrome "Handy-Hex" 2062 1/2x9/16 Short Box Wrench

[Duro-Chrome 2062 1/2x7/16 Short Box Wrench]
Fig. 170. Duro-Chrome 2062 1/2x9/16 Short Box Wrench, with Insets for Side View and Reverse Detail, ca. Late 1930s.

Fig. 170 shows a Duro-Chrome 2062 1/2x9/16 box wrench, stamped "Duro-Chrome" and "Handy-Hex" on the streamlined raised panel, with the fractional sizes and "Chrome Vanadium Steel" on the reverse panel.

The overall length is 4.6 inches. The finish is plain steel, possibly with traces of a plated finish.


Specialty Wrenches

Duro/Indestro also offered a number of specialty box-end wrenches for special service applications.


Indestro Chicago No. 739 Main Bearing and Cylinder Head Wrench

[Indestro Chicago 739 5/8x3/4 Offset Box-End Wrench]
Fig. 171. Indestro Chicago 739 5/8x3/4 Offset Box-End Wrench, with Insets for Side View and Reverse Detail.

Fig. 171 shows an Indestro 739 5/8x3/4 offset box wrench, stamped "Indestro-Chicago, U.S.A." with the model number on one side, with "Chrome Vanadium Steel" in a slanted font on the reverse.

The overall length is 12.6 inches, and the finish is plain steel.

The Indestro catalogs list this wrench for main bearing and cylinder head service in the Chevrolet 6 up through 1932, plus the Pontiac 6 models from 1928 through 1932.


Super-Quality 767 Ford Main Bearing Socket Wrench

[Super-Quality 767 9/16(square)x3/4 Main Bearing Socket Wrench]
Fig. 172. Super-Quality 767 9/16(square)x3/4 Main Bearing Socket Wrench, with Insets for Side View, Broaching, and Marking Detail, ca. Mid 1930s to 1940.

Fig. 172 shows a Super-Quality 767 socket wrench with 9/16 double-square and 3/4 double-hex broachings, designed for servicing Ford main bearings. The wrench is marked "Super-Quality Made in U.S.A." with "Chrome Vanadium Steel" in a slanted font on the reverse.

The overall length is 15.4 inches, and the finish is cadmium plating.

The 1938 Indestro catalog lists this wrench for main bearing service on Ford "A", "AA", "B", "BB", and V8 engines. The catalog illustration shows the distinctive hexagonal shank used at that time for this and other socket and box-end wrench models.

The model 767 wrench was still listed in the 1939 Indestro catalog, but had been discontinued by 1941, with a model 183 wrench in "Select Steel" replacing the chrome alloy model.


Duro-Chrome 268 "Handy-Hex" 7/16x1/2 8-Point Brake Wrench

[Duro-Chrome 268 7/16x1/2 8-Point Brake Wrench]
Fig. 172B. Duro-Chrome 268 7/16x1/2 8-Point Brake Wrench, with Inset for Reverse Detail, ca. Mid to Late 1930s.

Fig. 172B shows a Duro-Chrome 268 7/16x1/2 8-point brake wrench, stamped "Duro-Chrome" and "Chrome Vanadium Steel" with the model number on the shank, with "Ford Brakes" and "Handy-Hex" and the fractional sizes on the reverse.

The overall length is 11.0 inches.


Indestro "Super-Quality" 763 9/16x5/8 S-Shaped Box-End Wrench

[Indestro Super-Quality 763 9/16x5/8 S-Shaped Box_End Wrench]
Fig. 173. Indestro "Super-Quality" 763 9/16x5/8 S-Shaped Box-End Wrenches, with Inset for Reverse Detail, ca. Mid 1930s to Early 1940s.

Fig. 173 shows an Indestro "Super-Quality" 763 9/16x5/8 S-shaped box-end wrench, stamped with "Super-Quality" and "U.S.A." on the front, with "Chrome Vanadium Steel" in a slanted font on the reverse.

The overall length is 8.0 inches, and the finish is chrome plating with polished box ends.


Handy-Hex 02072 3/4x7/8 S-Shaped Box-End Wrench

Two more recently acquired examples of the Handy-Hex brand will help to further illustrate the changing models and markings. Both tools are of the unusual S-Shaped box wrench type, or "double crescent" wrenches as the Duro catalogs call them.

[Handy-Hex 02072 3/4x7/8 S-Shaped Box-End Wrench
Fig. 174. Handy-Hex 02072 3/4x7/8 S-Shaped Box-End Wrench, with Inset for Reverse Detail, ca. Early to Mid 1930s.

Fig. 174 shows an earlier Handy-Hex model 02072 3/4x7/8 S-shaped box wrench, stamped "Handy-Hex and "Made in U.S.A." with the model number on the shank, with "Chrome Vanadium Steel" on the reverse.

The overall length is 9.7 inches.

The Handy-Hex brand with the leading "0" in the model number suggests that this is an early 12-point wrench, possibly dating to the early 1930s.


Duro-Chrome 2071 "Handy-Hex" 11/16x25/32 S-Shaped Box-End Wrench

[Duro-Chrome 2071 11/16x25/32 S-Shaped Box-End Wrench
Fig. 175. Duro-Chrome 2071 11/16x25/32 S-Shaped Box-End Wrench, with Inset for Reverse Detail, ca. Mid to Late 1930s.

Fig. 175 shows a similar Duro-Chrome model 2071 11/16x25/32 S-shaped box wrench, stamped "Duro-Chrome" and "Handy-Hex" with the model number on the shank, with "Chrome Vanadium Steel" on the reverse.

The overall length is 8.7 inches.

This second wrench bears the modern catalog number 2071, but retains the "Handy-Hex" marking to show continuity with the older brand. The manufacturing date for this is likely mid-1930s.


Handy-Hex 02081 9/16x5/8 Half-Moon Box-End Wrench

[Handy-Hex 02081 9/16x5/8 Half-Moon Box-End Wrench
Fig. 176A. Handy-Hex 02081 9/16x5/8 Half-Moon Box-End Wrench, with Inset for Reverse Detail, ca. Early to Mid 1930s.

Fig. 176A shows a Handy-Hex 02081 9/16x5/8 half-moon box wrench, stamped with "Chrome Vanadium Steel" and "Handy-Hex" on one side, with "Manifold & Starter" and "Made in U.S.A." on the reverse.

The overall length is 7.2 inches, and the finish is nickel plating, with some losses due to wear.

The Duro catalogs refer to this style as an "elbow wrench". An example of the Duro-Chrome version of this model can be seen as the Duro-Chrome 2081 Half-Moon Box Wrench.


Indestro Super-Quality 769 9/16x5/8 Half-Moon Box-End Wrench

[Indestro Super-Quality 769 9/16x5/8 Half-Moon Wrench]
Fig. 176B. Indestro Super-Quality 769 9/16x5/8 Half-Moon Wrench, with Inset for Marking Detail, ca. Late 1930s to Early 1940s.

Fig. 176B shows a similar Indestro Super-Quality 769 9/16x5/8 half-moon box wrench, stamped "Indestro U.S.A." with "Super-Quality" and the model number on the front side, with the fractional sizes and "Chrome Vanadium Steel" in the slanted font on the reverse.


Combination Wrenches

Duro introduced the Duro-Chrome 20xx series of combination wrenches sometime in the 1930s, and the original design had a thin flat shank with a plain rounded head. This flat-shank style is illustrated in the 1938 and 1939 Duro-Chrome catalogs.

Some time after 1939 Duro redesigned its combination wrenches, and the new models included a panelled shank with rounded edges plus a distinctive "dart" design at the open end. This design remained in production at least until the 1960s. The figures below will show several examples of this "Dart" style.

With the introduction of the "Dart" style Duro also offered a second 22xx series of combination wrench models. Initially the 22xx series featured extra-thin heads and flat shanks, and were intended as a light-duty alternative for work in cramped spaces. But by the 1960s the 22xx line had become Duro's standard-duty combination wrenches, and the 20xx "Dart" series was eventually phased out.


Early Duro-Chrome 02032 7/16 Thin Combination Wrench

We'll begin with some early examples of the Duro-Chrome combination wrench series.

[Duro-Chrome 02032 7/16 Thin Combination Wrench]
Fig. 177. Duro-Chrome 02032 7/16 Thin Combination Wrench, with Insets for Side View and Reverse Detail, ca. 1934-1939.

Fig. 177 shows an early Duro-Chrome 02033 1/2 combination wrench with a flat shank, stamped with the Duro-Chrome trademark and "Forged in U.S.A." on the face, with the fractional size and model number on the reverse.

The overall length is 7.5 inches. The wrench has an unusual two-part plated finish, consisting of polished chrome on the faces and box end with a softer cadmium finish on the shank.

The top inset shows a side view of the wrench, illustrating the very thin profile of this early model.


Early Duro-Chrome 02033 1/2 Thin Combination Wrench

[Duro-Chrome 02033 1/2 Thin Combination Wrench]
Fig. 178. Duro-Chrome 02033 1/2 Thin Combination Wrench, with Insets for Side View and Reverse Detail, ca. 1934-1939.

Fig. 178 shows an early Duro-Chrome 02033 1/2 combination wrench with a flat shank, stamped with the Duro-Chrome trademark and "Forged in U.S.A." on the face, with the fractional size and model number on the reverse.

The overall length is 7.5 inches. The wrench has an unusual two-part plated finish, consisting of polished chrome on the faces and box end with a softer cadmium finish on the shank.

The top inset shows a side view of the wrench, illustrating the very thin profile of this early model.


Early Duro-Chrome 02035 5/8 Thin Combination Wrench

[Duro-Chrome 02035 5/8 Thin Combination Wrench]
Fig. 179. Duro-Chrome 02035 5/8 Thin Combination Wrench, with Insets for Side View and Reverse Detail, ca. 1934-1939.

Fig. 179 shows an early Duro-Chrome 02035 5/8 combination wrench with a flat shank, stamped with the Duro-Chrome trademark and "Forged in U.S.A." on the face, with the fractional size and model number on the reverse.

The overall length is 8.4 inches. The wrench has an unusual two-part plated finish, consisting of polished chrome on the faces and box end with a softer cadmium finish on the shank.

The top inset shows a side view of the wrench, illustrating the very thin profile of this early model.


Early Duro-Chrome 02036 11/16 Thin Combination Wrench

[Duro-Chrome 02036 11/16 Thin Combination Wrench]
Fig. 180. Duro-Chrome 02036 11/16 Thin Combination Wrench, with Insets for Side View and Reverse Detail, ca. 1934-1939.

Fig. 180 shows an early Duro-Chrome 02036 11/16 combination wrench with a flat shank, stamped with the Duro-Chrome trademark and "Forged in U.S.A." on the face, with the fractional size and model number on the reverse.

The overall length is 8.6 inches. The finish is cadmium plating on the shank with polished chrome on the faces and box end.

The top inset shows a side view of the wrench, illustrating the very thin profile of this early model.


Duro-Chrome 2031 3/8 Combination Wrench, Dart Style

[Duro-Chrome 2031 3/8 Combination Wrench]
Fig. 181. Duro-Chrome 2031 3/8 Combination Wrench, with Inset for Reverse Detail, ca. 1942-1945.

Fig. 181 shows a Duro-Chrome 2031 3/8 combination wrench, marked "Forged in U.S.A." on the face, with a distinctive streamlined dart emanating from the head.

The overall length is 7.3 inches, and the finish is cadmium plating.


Duro-Chrome 2035 5/8 Combination Wrench, Dart Style

[Duro-Chrome 2035 5/8 Combination Wrench]
Fig. 182. Duro-Chrome 2035 5/8 Combination Wrench, with Inset for Reverse Detail.

Fig. 182 shows another example of the streamlined dart design, a Duro-Chrome 2035 5/8 combination wrench marked "Forged in U.S.A." on the face.

The overall length is 8.9 inches. and the finish is chrome plating with polished faces.


Duro-Chrome 2037 3/4 Combination Wrench, Dart Style

[Duro-Chrome 2037 3/4 Combination Wrench]
Fig. 183. Duro-Chrome 2037 3/4 Combination Wrench, with Inset for Side View, ca. 1942-1945.

Fig. 183 shows a Duro-Chrome 2037 3/4 combination wrench, marked "Forged in U.S.A." on the face.

The overall length is 10.2 inches, and the finish is cadmium plating.

This wrench is a good example of the curved "Forged in U.S.A." marking used on Duro and Indestro tools.


Duro-Chrome 2233 1/2 Thin Combination Wrench

The next several figures show examples of Duro's 22xx series of thin combination wrenches.

[Duro-Chrome 2233 1/2 Thin Combination Wrench]
Fig. 184. Duro-Chrome 2233 1/2 Thin Combination Wrench, with Inset for Reverse Detail, ca. 1942-1945.

We'll begin with Fig. 184, a Duro-Chrome 2233 1/2 combination wrench marked "Forged in U.S.A." on the face.

The overall length is 7.7 inches, and the finish is black oxide augmented with natural rust. The black oxide finish indicates production during the period 1942-1945.

This wrench isn't marked with a brand name, but can be identified by the model number and construction, and by the "Forged in U.S.A." marking along a curved arc.


Duro-Chrome 2234 9/16 Thin Combination Wrench

[Duro-Chrome 2234 9/16 Thin Combination Wrench]
Fig. 185. Duro-Chrome 2234 9/16 Thin Combination Wrench, with Insets for Side View and Marking Detail.

Fig. 185 shows another example of Duro's early thin series combination wrenches, a Duro-Chrome 2234 9/16 combination wrench marked "Forged in U.S.A." on the face.

The overall length is 8.3 inches, and the finish is chrome plating.

The top inset shows a side view of the wrench to illustrate the thin profile of the earlier production of this series.


Indestro Super 775 5/8 Thin Combination Wrench

Indestro also produced a comparable series of thin combination wrenches, as seen in the next figure.

[Indestro Super 775 5/8 Thin Combination Wrench]
Fig. 186. Indestro Super 775 5/8 Thin Combination Wrench, with Insets for Side View and Marking Detail, ca. 1945+.

Fig. 186 shows an Indestro Super 775 5/8 thin combination wrench, stamped "Super" on the face.

The overall length is 8.8 inches, and the finish is chrome plating.

The top inset shows the very thin profile of this wrench, similar to that of a tappet wrench.


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