MIL-DTL-8789F
3.4.5 Threads. All threads shall be in accordance with SAE-AS8879, except root radius is not
required on incomplete threads. External threads on aluminum alloy shall be produced by machining,
single point method or grinding.
3.5 Examination of product. The fitting shall conform to the material (see 3.3), design and
construction (see 3.4), identification markings (see 3.9) and workmanship (see 3.10) specified herein and
in the applicable specification sheets, when examined as specified in 4.9.1.
3.6 Performance. The fittings shall meet the following performance requirements. When hose
assemblies are required for testing the fittings shall be assembled on qualified hose in accordance with
MIL-DTL-8788.
3.6.1 Bulge resistance (connector to hose assembly). The ball gage, used to determine the inner
tube diameter at the bulge, shall fall through the section under its own weight through the section of the
end-fitting insert in the hose, when tested in 4.9.2.
3.6.2 Proof pressure. The hose assembly shall not leak or fail during or at the completion of the test,
as specified in 4.9.3, with the applicable proof pressure specified in table II. There shall be no visual
evidence of damage or permanent deformation.
TABLE II. Performance characteristics. 1/ 2/
Burst
Proof
Assembly
Bend radius
Hose
Operating
pressure,
length of
inside,
pressure,
pressure
dash
min
min
min
test samples
size
psi (bar)
inch (mm)
psi (bar)
psi (bar)
inch (cm) 3/
8,000
16,000
3,000
3.00 (76.20)
16 (41)
4
(207)
(1103)
(207)
7,000
14,000
3,000
3.38 (85.85)
18 (46)
5
(483)
(965)
(207)
7,000
14,000
3,000
5.00
21 (53)
6
(483)
(965)
(207)
(127.00)
7,000
14,000
3,000
5.75
24 (61)
8
(483)
(965)
(207)
(146.05)
6,000
12,000
3,000
6.50
30 (76)
10
(165.10)
(414)
(827)
(207)
6,000
12,000
3,000
7.75
33 (84)
12
(414)
(827)
(207)
(196.85)
5,000
10,000
3,000
9.63
24 (61)
16
(345)
(689)
(207)
(244.60)
1/ Dimensions are in inches.
2/ Metric equivalents are given for information only.
3/ Represents length of assembly per MIL-DTL-8790.
A minimum free length of
12 inches (30.5 cm) shall remain between fittings.
3.6.3 Leakage. The hose assembly shall not show any evidence of leakage during or at the
completion of the test, when tested in 4.9.4.
3.6.4 Burst pressure. There shall be no leakage at the end fittings or in the hose below and including
the minimum burst pressure specified in table II when tested in 4.9.5. The fittings shall not loosen or
disconnect from the hose. The hose shall not burst or develop a permanent blister.
6
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