MIL-DTL-38726B
3.6.1 Hose. The adapter assembly specified herein shall be compatible with hose conforming to
MIL-DTL-5593 to form flexible hose assemblies in accordance with AN6270 for use in low-pressure
systems.
3.6.2 Dimensions. Dimensions and tolerances shall be as specified in MS27404.
3.6.3 Screw threads. Screw threads shall be in accordance with SAE-AS8879.
3.6.4 Surface roughness. Surface roughness shall be in accordance with ASME B46.1.
3.6.5 Interchangeability. All parts having the same manufacturer's PIN shall be functionally and
dimensionally interchangeable.
3.7 Performance.
3.7.1 Proof pressure. When tested as specified in 4.7.2 with the applicable proof pressure specified
in table II, there shall be no evidence of leakage from the adapter assembly.
3.7.2 Leakage. When tested as specified in 4.7.3, there shall be no evidence of leakage from the
adapter assembly.
3.7.3 Burst pressure. When tested as specified in 4.7.4, the adapter assembly shall not leak or blow
off the hose at any pressure that is less than the burst pressure specified in table III.
TABLE III. Performance characteristics.
Operating
Proof
Burst
Bend radius
Adapter
pressure,
pressure,
pressure,
(inside of bend),
assembly
max
min
min
min
size
psi (MPa)
psi (MPa)
psi (MPa)
inch (mm)
-2
300 (2.07)
600 (4.14)
2000 (13.79)
2 (50.80)
-3
250 (1.72)
500 (3.45)
1700 (11.72)
2 (50.80)
-4
200 (1.38)
400 (2.76)
1250 (8.62)
4 (101.60)
-6
150 (1.03)
300 (2.07)
1000 (6.89)
4 (101.60)
-8
150 (1.03)
250 (1.72)
750 (5.17)
6 (152.40)
-10
150 (1.03)
250 (1.72)
700 (4.83)
6 (152.40)
3.7.4 Low temperature flexibility. When tested as specified in 4.7.5, there shall be no evidence of
leakage from the adapter assembly.
3.7.5 Over-tightening torque. When tested as specified in 4.7.6, there shall be no evidence of failure
of the adapter assembly or difficulty in turning the swivel nut on the nipple by hand.
3.7.6 Plating thickness verification (cadmium and zinc plating's). Plating thickness shall be
3.7.7 Salt spray (4130 and 4140 steel fittings only). When tested in accordance with 4.7.8 the fittings
shall show no evidence of corrosion after 96 hours of salt spray.
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