A-A-2538 Adjusting Tool, Valve Tappet

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Male square drive. The square drive shall be of alloy steel, bored with a lengthwise hole to accept the screwdriver blade and shall be hardened to a Rockwell hardness of not less than 38 nor more than 54 on the “C” scale. Means shall be provided for retaining a wrench socket on the drive end, and for detaching same manually, without undue force or the use of any tool.

Screwdriver blade. The screwdriver blade shall be of steel, properly heat-treated and hardened to a Rockwell hardness of not less than 48 nor more than 58 on the “C” scale; the reading to be taken as near the tip as practicable. Means shall be provided for retaining the screwdriver within the square drive without impairing.

Accessories. Socket wrenches shall be furnished with 1/2 inch square drive in the following socket sizes: 1/2 inch, 9/16 inch and 5/8 inch.

Socket, socket wrenches. Socket wrenches shall be in accordance with GGG-W-641, type II, Class 2, Style A.

Identification marking. Each adjusting tool shall be etched or stamped in a permanent and legible manner with the manufacturer’s name or identifying symbol of such known character that the source may be readily identifiable, part number country of origin.

Finish. All surfaces shall be clean and free of pits, nodules, burrs and cracks or other detrimental defects.

Coating. The tools shall be coated to prevent rusting in accordance with accepted industry practice.

Workmanship. the adjusting tools shall be free from any defects that would affect appearance, serviceability or durability.

QUALITY ASSURANCE PROVISIONS

Sampling for inspection and testing. Sampling shall be in accordance with MIL-STD-105, Sampling Procedures and Tables for Inspection by Attributes. The lot size shall consist of all adjusting tools offered for acceptance at one time. The sample unit is one adjusting tool.

Examination of end item for visual and dimensional requirements. Each adjusting tool shall be examined for workmanship, marking, and dimensional requirements. The inspection level shall be Level I with an acceptable quality level (AQL’s) of 4.0 defects per hundred units.

Testing for hardness. The inspection level shall be S-2 with an AQL of 2.5 defects per hundred units. Testing shall be performed in accordance with ASTM E-18.

Torsion test. A torsion test shall be conducted on samples selected randomly in accordance with MIL-STD-105. Each adjusting tool shall be tested by inserting the male drive into a fixed female socket and applying a 300 inch-pound test load to the handle in accordance with Figure 2. If the tool breaks, cracks or becomes deformed, it shall be considered defective.

Regulatory requirements. In accordance with section 23.403 of the Federal Acquisition Regulations, the Government’s policy is to acquire items composed of the highest percentage of recovered materials practicable, consistent with maintaining satisfactory level of competition without adversely affecting performance requirements or exposing supplier’s employees to undue hazards from the recovered materials.