A-A-1346A
3.2 Dimensions and Sizes.
|
Wrench Opening |
Outside Diameter of Head |
Permitted Eccentricity of Box Wrench Opening to Outside Diameter |
Thickness of Head |
Distance Between Centers of Openings |
|||
|
Small head |
Large head |
Small head |
Large head |
|
Small head |
Large head |
|
|
Inch |
Inch |
Max. inches |
Max. inches |
Inch |
Max. inches |
Max. inch |
Min. inch |
|
7/16 |
1/2 |
0.695 |
0.775 |
0.015 |
3/8 |
3/8 |
4-7/8 |
|
9/16 |
5/8 |
0.868 |
0.946 |
0.018 |
11/32 |
7/16 |
5-11/16 |
|
5/8 |
3/4 |
0.946 |
1.125 |
0.018 |
7/16 |
35/64 |
6-7/16 |
|
11/16 |
3/4 |
1.025 |
1.125 |
0.018 |
33/64 |
35/64 |
6-3/4 |
3.3 Materials. The materials used in the manufacturing of the wrenches shall be such as to produce wrenches conforming to the physical requirements hereinafter described.
3.4 Marking. Each wrench shall be marked with the size on one of the faces or on the handle as close to each head as is practicable in a plain and permanent manner. In addition to size markings, each wrench shall be marked in a plain and permanent manner with the manufacturer’s name or trademark of such known character that the source of manufacture maybe readily determined.
3.5 Hardness. Wrenches shall be treated to a Rockwell C hardness not less that 38 nor more than 55 when tested per ASTM-E-1 8.
3.6 Wrench Opening. The nut and bolt head-engaging surfaces of the open-end wrench shall be finished in a smooth and well-defined manner. Tolerances shall be such as to insure acceptance when gaged with gages conforming to ASME B107. 17M.
3.7 Finish.
3.7.1 Surface Finish. All surfaces shall be thoroughly cleaned, free from cracks, and essentially free from burrs, pits, nodules, and other detrimental deficiencies.
3.7.1.1 Minimum Area Surface Finish. A minimum of 180° of the outer periphery of the box ends (90° on each side of the longitudinal axis of the wrench) shall be bright and shall have a maximum roughness height value of 30 micro inches (0.76 micrometers).
3.7.2 Coatings. The coating shall be either chrome plate (3.7.2.1) or alternate coating (3.7.2.2). The coating shall be adherent, smooth, continuous, and free from uncoated areas, pits, blisters, nodules, and any other defects that would interfere with their protective value and serviceability.
3.7.2.1 Chrome Plate. Wrenches shall have a protective-decorative nickel-chromium plating. The nickel thickness shall be a minimum of 0.000150 inch. The chromium thickness shall be a minimum of 0.000003 inch. A nickel-iron undercoating (16’% iron max.) may be substituted for nickel.
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