MIL-PRF-81975C
normal service.
3.4.2.1 Protective coatings. Protective coatings shall not chip or flake and shall prevent
deterioration of the base material under all conditions of service, especially those conditions
where high concentrations of salt may be encountered. Aluminum alloy parts shall be anodized
in accordance with MIL-A-8625 or chemical conversion coated per MIL-DTL-5541. Flame
coating may be used in accordance with SAE-AMS2447. Painted surfaces shall not be allowed
as a protective coating unless specified in 3.6.10. Cadmium and chromium coatings shall not be
used.
3.4.3 Prohibited materials. Magnesium, chromium, zinc, cadmium, and copper or their
alloys shall not be used. Teflon shall not be used in any location where impact loads may be
encountered. Except for identification markings on couplings as specified in 3.6.10, paint shall
not be used.
3.4.3.1 Age-sensitive materials. Age-sensitive materials shall not be used, except those
specified in 3.6.1.
3.4.4 Castings. Castings shall be clean, sound, and free from holes, porosity, cracks, and
other defects. Castings shall be classified in accordance with SAE-AMS2175, Class 1, Grade C,
but all critical (load bearing) castings shall be Class 1, Grade B.
3.4.5 Dissimilar metals. Dissimilar metals, as specified in MIL-STD-889, shall not be used
in contact with each other unless protected against electrolytic corrosion.
3.5 Selection of specifications and standards. Specifications and standards for necessary
commodities and services not specified herein shall be selected by standard commercial practices
or as specified in the contract.
3.6 Flight/ground test. The contract shall specify the requirements for laboratory and flight
tests for final U.S. approval of the coupling.
3.7 Construction. The coupling shall be designed to prevent incorrect assembly. It shall be
constructed so that no parts will work loose during shipment, storage, or operational use. The
unit shall be constructed to withstand the strains, jars, vibrations, and other conditions incident to
shipping, storage, installation, and use.
3.7.1 O-rings, packing, and seals. O-rings, packing, and seals shall conform to SAE-
AS568, SAE-AMS-R-25988, SAE-AMS-R-83485, or SAE-AMS7259. Their design and
construction shall be such as to ensure maximum protection against leakage and damage due to
friction.
3.7.2 Threaded parts. Screw threads shall conform to MIL-S-7742 or SAE-AS8879. Pipe
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