A-A-1352A
3.8 Finish.
3.8.1 Surface Finish. All surfaces shall be thoroughly cleaned, free from cracks, and essentially free from burrs, pits, nodules, and other detrimental deficiencies.
3.8.1.1 Minimum Area Surface Finish. Both faces of the open end shall be bright and shall have a maximum roughness height value of 30 microinches (0.76 micrometers).
3.8.2 Coating. The coating shall be chrome plate (3 .8.2. 1) phosphate (3.8.2.2), oxide (3 .8.2.3), or alternate coating (3.8.2.4) and shall be specified in the contractor order. 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.
3.8.2.1 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.
3.8.2.1.1 Chrome Plate Test.
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: electrodeposited nickel coatings on magnetic substances.
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 of cross 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, and free of visible defects, such as blisters, pits, roughness, cracks, and uncoated areas. Surfaces shall not be stained or discolored and shall have a bright appearance.
The electroplated tool shall be clean and free of damage. The tool shall be tested for adhesion of electroplated materials in accordance with ASTMB571, Standard Test Methods for Adhesion of Metallic Coatings, by one of the following methods: Grind-Saw, Push, File, or Burnishing.
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