MIL-DTL-25531F
3.2.1 Standard parts. With the exception specified in 3.2.a, MS and AN standard parts shall be
used where they suit the purpose. They shall be identified on the drawings by their part numbers.
3.3 Materials.
3.3.1 Fungus-proof materials. Materials that are nutrients for fungi shall not be used where it is
practical to avoid them. Where used and not hermetically sealed, they shall be treated with a
fungicide agent acceptable to the procuring activity. However, if they will be used in a
hermetically sealed enclosure, fungicide treatment will not be necessary.
3.3.2 Metals. Metals shall be of the corrosion-resistant type or suitably treated to resist
corrosion due to fuels, salt spray, or atmospheric conditions which may be encountered in
storage or normal service.
3.3.2.1 Dissimilar metals. Unless suitably protected against electrolytic corrosion, dissimilar
metals shall not be used in intimate contact with each other. Dissimilar metals are defined in
MIL-STD-889.
3.3.3 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.
3.4 Design. The coupling shall conform dimensionally to Figure 1 and shall be in accordance
with the following requirements. One end of the coupling shall mate with the MS33740 nipple
and the other end shall mate with the flange of hose and fitting MS17833. No part of the
coupling shall protrude into the nipple bore. Three holes shall be provided as stated in paragraph
3.5.2 for possible attachment of handling ring.
3.4.1 Reliability. The coupling shall be designed and constructed as specified herein in a
manner that will insure the highest degree of operational reliability under all service conditions.
3.4.2 Instructions. Brief appropriate operating instructions such as "PUSH COLLAR
FORWARD TO LOCK," or a directional arrow shall be provided as a permanent part of the
coupling, preferably a part of the outer coupling casting.
3.5 Construction. The coupling shall be so constructed that it will withstand the strains, jars,
vibrations, and other conditions incident to installation and service usage.
3.5.1 Maintainability. The coupling shall have a minimum number of parts consistent with
reliability. Its design shall permit easy assembly, disassembly, location of trouble sources, and
maintenance with tools normally available commercially, by service maintenance personnel with
a minimum of training.
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