MIL-DTL-29210E
FIGURE 4. Female end fitting assembly.
3.4.3.1 Coupling components. Coupling components shall consist of a serrated stem with a raised
continuous collar, a swivel nut and spud (for female section). Coupling components shall also consist of
a two-part interlocking type clamp with two bolts for the .75-inch (19.05 mm) size hose and four bolts for
the larger size hoses.
3.4.3.2 Seating surface. The seating surface of the female stem shall be round to fit the beveled
copper insert or polymer insert in the female spud, as specified (see 6.2). There shall be no sharp edges
on the nipples or the clamps to cause damage to the tube or cover. When assembled, there shall be
provisions for additional take-up of clamps in service.
3.4.3.3 Special stem design. The male and female stems shall be designed with rib type right hand
spirals at the end of the stem to screw into the stainless steel liners providing positive gripping and
retention. The pitch of the rib type spirals shall be.312-inch (7.92 mm) for the 1.5-inch (38.10 mm) and 2-
inch (50.80 mm) hose fittings and .25-inch (6.35 mm) for the .75-inch (19.05 mm), 1-inch (25.40 mm), and
1.25-inch (31.75 mm) hose fittings. The spiral on the male and female stems shall be of sufficient length
to ensure that part of the metal liner is always under the clamp which provides additional gripping and
retention when the clamps are torqued over the hose (see 6.5).
3.4.3.4 Threads. Female threads on spud and male connections shall be American Standard Taper
Pipe (NPT) meeting the requirements of FED-STD-H28. The female threads on the swivel shall be
American Standard Straight Pipe (NPSM).
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