MS20760D
Maximum operating temperature 275° F (135°C).
Materials and finishes shall be in accordance with table II. All platings shall be capable of meeting a minimum of 96 hours salt spray test in accordance with ASTM 8117. 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.
TA8LE II. Material and finish code letters.
Code letter |
Material |
Finish |
- |
Steel 1137 or 1141 in accordance with ASTM A108 |
Cadmium plated in accordance with SAE-AS4875. |
|
D |
Aluminum alloy 2014-T4 in accordance with SAE-AMS-QQ-A-225/6 or aluminum alloy casting in accordance with ASTM 8108/8108M |
Anodized anodize in accordance with MIL-A-8625, type 2, dye light blue |
Aluminum alloy 2024 or 2024 forging and bar stock in accordance with SAE-AS4875 |
||
|
DA |
Aluminum alloy 2014-T4 in accordance with SAE-AMS-QQ-A-225/6 or aluminum alloy casting in accordance with ASTM 8108/108M |
Chemical conversion coating in accordance with, MIL-DTL-5541, type II, class 3 |
Aluminum alloy 2024 or 2024 forging and bar stock in accordance with SAE-AS4875 |
||
F |
Steel 1137 or 1141 in accordance with ASTM A108 |
Zinc plating in accordance with ASTM 8633; type VI, Fe/Zn 5. 2/ |
H |
Steel 1137 or 1141 in accordance with ASTM A108 |
Aluminum-nickel in accordance with ASTM F1136/F1136M, grade 3, NC. |
R |
Corrosion resistant steel (CRES) alloy 321 in accordance with SAE-AS4875 |
Passivate in accordance with SAE-AS4875 |
W |
Aluminum alloy 7075-T73 or T7352 in accordance with SAE-AS4875 |
Anodize in accordance with MIL-A-8625, type 2, dye brown |
WC |
Aluminum alloy 7075-T73 or T7352 in accordance with SAE-AS4875 |
Chemical conversion coating in accordance with, MIL-DTL-5541, type II, class 3 |
T 1/ |
Titanium in accordance with SAE-AS4875 |
Anodized in accordance with SAE-AS4875 |
Z |
Steel 1137 or 1141 in accordance with ASTM A108 |
Zinc plating in accordance with ASTM 8633; type II or III, Fe/Zn 5, or ASTM 8695, type II, class 5. |
|
ZN |
Steel 1137 or 1141 in accordance with ASTM A108 |
Zinc plating in accordance with ASTM 8633; type II or III, Fe/Zn 5, or ASTM 8695, type II, class 5 with NAVAIR TCP in accordance with MIL-DTL-81706, type II, class 1A. |
1/ Titanium shall not be used in oxygen systems.
2/ Hexavalent chromium free
5
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