MIL-DTL-25427B
with hydraulic fluids conforming to MIL-PRF-5606, MIL-PRF-83282, or MIL-PRF-87257. The
finish requirements of the coupling shall be as specified in table I.
3.4.1 Recycled, recovered, or environmentally preferable materials. Recycled,
recovered, or environmentally preferable materials should be used to the maximum extent
possible, provided that the material meets or exceeds the operational and maintenance
requirements, and promotes economically advantageous life cycle costs.
TABLE I. Materials and finishes.
Material
Material
Material
Finish
Note
Code
specification
SAE-AMS-QQ-A-225/6
Anodized per
Aluminum
temper T351
MIL-A-8625, type II,
alloy
For 1000 psi
class 1 Dichromate sealed
2014/2024
D
or Class 2, Nickel acetate
only
seal
Aluminum
SAE-AMS-QQ-A-225/9
Anodized per
For 3000 psi
alloy
W
Temper T73
MIL-A-8625, type II,
7075
class 2 dyed brown
Passivate per
SAE-AMS5529,
Stainless
SAE-AMS2700
SAE-AMS5643,
steel 300
SAE-AMS5678 or
series
S
SAE-AMS5659
15-5 PH or
For 3000 and
17-4PH
5000 psi
Carbon steel
SAE-AMS5085, or
1/ Cadmium plated per
C
SAE-AMS5047
SAE-AMS-QQ-P-416,
type II, class 2
Titanium
SAE-AMS4965
None
T
1/ This document references cadmium plating. See 6.5 for information using cadmium.
3.5 Design and construction. The configuration, dimension, and the detail design and
construction of the coupling shall conform to the applicable specification sheets or MS sheets.
The objective of the design is obtaining smallest size and lightest weight possible commensurate
with meeting the performance requirements specified herein. When the two halves coupled, the
coupling assembly shall permit fluid flow in intended direction in accordance with the rated flow
and pressure drop specified in tables II. Flow shall not be blocked under surge conditions.
3.5.1 Temperature range. Coupling shall be designed for operation with type II
hydraulic fluid having the temperature range from -65 °F to +275 °F.
3.5.2 Sealing and fluid loss. When uncoupled, the couplings shall seal at the point of
disconnection at the end of the disconnected lines and shall not permit external leakage during
any phase of coupling or uncoupling. Fluid loss (spillage) as specified in tables III is not
5
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