MIL-DTL-13531J
3.5.7.1.3 Finish. All platings shall be capable of meeting the 96 hour salt spray test in accordance
with ASTM B117. Fluid passages, other openings, and internal threads shall not be subject to the plating
thickness requirement and may have bare areas provided they are protected with a light film of oil. The
following exceptions shall apply:
a. Phosphate coated fittings shall be subjected to all tests as specified in MIL-DTL-16232, Class
1, except for the salt spray test. The salt spray test is required only to verify the phosphating
process or changes thereto.
b. Passivated fittings shall be subjected only to the copper sulfate tests as specified in
appendix A. Fittings passing this test shall be returned to stock for usage after each fitting is
thoroughly rinsed in deionized water and thoroughly dried.
Note: Cadmium and zinc finishes shall not be stocked, stored or issued under the same national stock
number (NSN).
3.5.7.1.4 Cadmium is not recommended. Carbon steel material with cadmium plating shall only be
used when other materials and finishes specified in this document cannot meet performance
requirements (see 6.5).
3.5.8 Displacement angle. Displacement angle shall be in accordance with SAE J517.
3.6 Performance requirements.
3.6.1 Resistance to impulse pressure. Hose and hose assemblies when subjected to resistance to
impulse pressure testing in 4.8.3 shall withstand specified impulse pressures and cycling in accordance
with SAE-AS603 with the exception of the requirement in this specification and 4.8.3 (see table II, table III
and figure 4) without hose leakage, leakage between the fitting and hose, leakage at the threaded
connection, cracking, rupture or detachment of the fitting.
3.6.2 Length change. Bulk hose when tested in 4.8.4 hose length change shall not exceed the limit
specified in table III.
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