MS27404B
TABLE I. Material and designators.
Designator |
Material |
Alloy requirements |
J |
Corrosion resistant steel (CRES), type 304 |
SAE-AMS5639 |
K |
Corrosion resistant steel (CRES), type 316 |
SAE-AMS5648 |
P |
Chrome-molybdenum steel 4130 |
SAE-AMS6348 or SAE-AMS6370 |
S |
Steel 4140 |
SAE-AMS6349 or SAE-AMS6382 |
T 1/ |
Titanium |
SAE-AMS4928 (6AI-355 annealed) |
w |
Aluminum alloy 7075-T73 |
SAE-AMS-QQ-A-225/9 or SAE-AMS4141 |
1/ Not for use in oxygen systems.
Finish. Finishes shall be as specified in table II. All plating's shall be capable of meeting a minimum of 96 hours salt spray test in accordance with ASTM B117. The fittings shall show no evidence of corrosion after 96 hours of salt spray. 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.
TABLE II. Material and finish identification codes.
Plating finish designator |
Material |
Plating Finish |
Blank |
Steel 4130 or 4140 |
Cadmium plating in accordance with SAE-AMS-C-81562, type II, class 3 or SAE-AMS-QQ-P-416, type II, class 2. 1/ |
CN |
Cadmium plating in accordance with SAE-AMS-C-81562, type II, class 3 or SAE-AMS-QQ-P-416, type II, class 2 with NAVAIR trivalent chromium pretreatment (TCP) in accordance with MIL-DTL-81706, type II, class 1A. |
|
E |
NAVAIR TCP in accordance with MIL-DTL-81706, type II, class 1A. |
|
F |
Steel 4130 or 4140 |
Zinc plate (finish J, P, or R) with NAVAIR TCP in accordance with MIL-DTL-81706, type II, class 1A. |
Blank |
Aluminum |
Aluminum alloy anodize in accordance with MIL-A-8625, type II. |
H |
Steel 4130 or 4140 |
Aluminum-nickel in accordance with ASTM F1136/F1136M, grade 3, NC. |
J |
Steel 4130 or 4140 |
Zinc-nickel in accordance with SAE-AMS2417, type 1. |
P |
Steel 4130 or 4140 |
Zinc phosphate finish in accordance MIL-DTL-16232 type Z, class1. |
R |
Steel 4130 or 4140 |
Zinc plating in accordance with ASTM B633; type VI, Fe/Zn 5. 2/ |
Blank |
CRES |
No additional finish. Passivation in accordance with SAE-AMS2700, type 6 or 7. |
Blank |
Titanium |
Anodize in accordance with SAE-AMS2488 type 2. |
Z |
Steel 4130 or 4140 |
Zinc plating in accordance with ASTM B633; type II or III, Fe/Zn 5, or ASTM B695, type II, class 5. |
ZN |
Steel 4130 or 4140 |
Zinc plating in accordance with ASTM B633; type II or III, Fe/Zn 5, or ASTM B695, type II, class 5 with NAVAIR TCP in accordance with MIL-DTL-81706, type II, class 1A. |
1/ Embrittlement test need not be run.
2/ Hexavalent chromium free.
3
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