MIL-C-52705B
3.3.3 Couplings.
3.3.3.1 Castings. Cast parts of couplings shall conform to ASTM B 584, copper alloy
UNS no. C85200, C85400, or C85700. Type C coupling components shall be malleable iron
conforming to ASTM A 47M, grade optional. Castings with holes are not acceptable.
3.3.3.2 Rods. Copper alloy rods for manufacturing of coupling components shall conform to
ASTM B 16; ASTM B 21, alloy optional; ASTM B 124, copper alloy no. C46200, C46400, or
C48200; or ASTM B 453, alloy optional.
3.3.4 Expansion rings. Expansion rings shall be made from seamless drawn tubing
conforming to ASTM B 135, copper alloy UNS no. C23000, C26000, C27000, C27200, C28000,
C33000, C33200, or C37000.
3.3.5 Rubber washers. The rubber washers shall be molded from heat-resistant and water-
resistant synthetic rubber stock conforming to ASTM D 2000 M3DA A26B36C32EA14G21 and
shall conform to the dimensions shown in figures 2 and 3.
3.3.6 Type B coupling parts and clamps. All type B coupling parts and clamps shall be brass
conforming to ASTM B 584, copper alloy no. C85200.
3.4 Finish. Outside surfaces of sandcastings shall be made smooth by shotblasting or
sandblasting. The inside surfaces of all parts, except the corrugations in male and female
sections, shall be machine finished.
3.4.1 Finish on type C couplings. Unless otherwise specified (see 6.2), type C coupling
components, except washers and soft metal contact surface inserts, shall be zinc plated in
accordance with the requirements of ASTM B 633, Fe/Zn 25, type II.
3.5 Corrugations. The corrugations in male and female sections shall be left rough so as to
bind the hose.
3.6 Threads. Type A and type B couplings shall be threaded NPSH and type C couplings
shall be threaded NPT. All threads shall be in accordance with FED-STD-H28.
3.7 Parts. A complete set of couplings of the sizes specified (see figures 2, 3 and 4) shall
consist of the following parts:
Type A -
Part 7
-
Female section.
-
Part 8
-
Male section.
-
Part 3
-
Swivel of female section.
-
Part 4
-
Expansion rings (one each for male and female sections).
-
Part 5
-
Rubber washer fittings recess in swivel.
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