MIL-DTL-38726B
TABLE I. Material.
Material
Alloy requirements
Corrosion resistant steel (CRES), type 304
SAE-AMS5639
Corrosion resistant steel (CRES), type 316
SAE-AMS5648
Chrome-molybdenum steel 4130
SAE-AMS6348 or SAE-AMS6370
Steel 4140
SAE-AMS6349 or SAE-AMS6382
Titanium 1/
SAE-AMS4928 (6AI-355 annealed)
Aluminum alloy 7075-T73
SAE-AMS-QQ-A-225/9 or SAE-AMS4141
1/ Not to be used on oxygen systems.
3.5 Finish.
3.5.1 Steel fitting finish (except CRES).
a. Cadmium plating. Cadmium plating in accordance with SAE-AMS-C-81562, type II, class 3 or
SAE-AMS-QQ-P-416, type II, class 2. 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.
b. Zinc platings.
(1) Zinc plating shall be in accordance with ASTM B633; type II or III, Fe/Zn 5, or
ASTM B695, type II, class 5. Both zinc platings specified in ASTM B633 type III and
ASTM B695 type II shall meet the same 96-hour salt spray test endurance as
ASTM B633 type II zinc plating. Not for use in aircraft.
(2) Zinc plating in shall be in accordance with ASTM B633, type VI, Fe/Zn 5 and shall be
hexavalent chromium free.
(3) Aluminum-nickel in accordance with ASTM F1136/F1136M, grade 3, NC.
(4) Zinc phosphate. Zinc phosphate shall be in accordance with MIL-DTL-16232, type Z.
(5) Zinc nickel shall be in accordance with SAE-AMS2417, type 2, grade B.
Note: For new design it is recommended that phosphate coating be specified when electrodeposited
zinc or mechanically-deposited cadmium plating is not required.
c. Chemical film. NAVAIR trivalent chromate pretreatment (TCP) in accordance with
MIL-DTL-81706, class 1A, material form (1 through 6), application method A, B, or C. Example
of a PIN: M817061A3C.
3.5.2 Corrosion resistant steel. Corrosion resistant steel shall be passivated in accordance with
SAE-AMS2700, type 6 or 7.
3.5.3 Titanium. Titanium shall be anodized in accordance with SAE-AMS2488, type 2.
3.5.4 Aluminum parts. Aluminum parts shall be anodized in accordance with MIL-A-8625, type II, for
a period of 30 ±5 minutes.
3.5.4.1 Current density. Anodic current density shall be within 12 to 16 amperes per square foot,
measured on a flat sheet.
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