MIL-DTL-38726B
3.5.5 Finish. All platings shall be capable of meeting the 96 hour salt spray test in accordance with
4.6.5. 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 adapters 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
SAE-AMS2700. Fittings passing this test shall be returned to stock for usage after each fitting
is thoroughly rinsed in deionized water and thoroughly dried.
3.5.5.1 Color coding. The adapter assembly shall be color-coded in accordance with table II.
TABLE II. Color coding.
Color
Material/plating
Brown
Aluminum 7075
Black
4140 steel cadmium
Olive drab
4130 steel cadmium plated
Gray in accordance with FED-STD-595/36076,
Titanium
/36081, /36099, /36118, /36134, /36152, /36170,
/36173, or /36176
Natural color
CRES
Yellow
ASTM B633 type II
Yellow
ASTM B633, type III
Flat black
Zinc phosphate
Clear
Zinc-nickel
3.5.6 Trivalent wenchability. When the finish has been damaged due to poor wrenchability, the
surface of the connector shall be touched up using the brush plating process below. The term "trivalent
wrenchability" is used to evaluate the ability of the finish to withstand abrasion from an excessive amount
of wrenching.
a. Brush plating of hard chromium by electrodeposition shall be in accordance with
SAE-AMS2451/5.
b. Brush plating of medium-hardness, low stress nickel by electrodeposition shall be in
accordance with SAE-AMS2451/9.
c. Brush plating of NAVAIR TCP shall be in accordance with MIL-DTL-81706, type 2, class A,
material form 1 through 6, application method B. Example of a PIN: M817062A6B.
3.5.7 Cadmium plating 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 Plating thickness verification (aluminum-nickel cadmium and zinc plating's). Plating thickness
3.6 Design and construction. The design of the adapter assembly shall be in accordance with
MS27404 and this specification, as applicable. The adapter assembly shall be suitable for use with hose
conforming to MIL-DTL-5593.
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