A-A-1357B
3.7 Wrench Opening. The nut and bolt head-engaging surfaces of the open end wrench shall be finished in a smooth and well-defined manner. The tips (working ends) of all open end wrenches shall also be chamfered or rounded to eliminate burrs. Tolerances shall be such as to insure acceptance when gaged with gages conforming to ASME B107.17M.
3.8 Handle. Wrench handle shall be flared or tapered.
3.9 Finish.
3.9.1 Surface Finish. All surfaces shall be thoroughly cleaned, free from cracks, and essentially free from burrs, pits, nodules, and other detrimental deficiencies.
3.9.1.1 Minimum Area Surface Finish. Both faces of the open end shall be bright and shall have a maximum roughness height value of 63 microinches. All other surfaces shall not be more than 125 microinches as specified in ANSI B46. 1.
3.9.2 Coatings. The coating shall be chrome plate (3 .9.2. 1) or alternate coating (3 .9.2.2) .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.
3.9.2.1 Chrome Plate. Wrenches shall have a protective-decorative nickel-chromium plating. The nickel thickness shall be a minimum of 0.000150 in. The chromium thickness shall be a minimum of
0.000003 in. A nickel-iron undercoating (16% iron max.) may be substituted for nickel.
3.9.2.1.1 Chrome Plate Tests.
One measurement of the thickness of each electroplated coating shall be conducted in accordance with any of the following, as appropriate, methods:
ASTM B 487: Standard Method for Measurement of metal and oxide coating thickness by microscopical examination of a cross section.
ASTM B 499: Standard Test Method for Measurement of coating thickness by the magnetic method: nonmagnetic coatings of magnetic basis metals.
ASTM B 504: Standard Method for Measurement of thickness of metallic coatings by the coulometric method.
ASTM B 530: Standard Test Method for Measurement of coating thickness by the magnetic method:electro deposited nickel coatings on magnetic and nonmagnetic substrates.
ASTM B 568: Standard Test Method for Measurement of coating thickness by x-ray spectrometry.
ASTM B 748: Standard Method for Measurement of thickness of metallic coatings by measurement ofcross section with a scanning electron microscope.
ASTM A 754: Standard Test Method for Coating thickness by x-ray fluorescence.
Visible contact marks resulting from electroplating operations shall be confined to the interior of the wrenching and drive openings. Surfaces of the electroplated tool shall be adherent, smooth, continuous,
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