MIL-DTL-27272C
TABLE I. Assembly torque values for class 1 fittings.
Assembly torque
Size
Class 1 fittings
(pound-inch ± 1%)
-3/-4
120
-4
180
-5
240
-6
300
-8
540
-10
840
-12
1,020
-16Z
1,680
20Z
2,760
-24Z
3,900
3.6.2 Lubricant wear. Following application of the lubricant, class 1 fittings shall be capable of being
assembled six times and disassembled five times to the assembly torque values as specified in table I
(see 4.6.2).
3.6.3 Over-tightening torque. Fittings shall be capable of being assembled and disassembled using
SAE AS4395 and SAE AS33514 mating adapters 15 times to the over-tightening torque specified in
SAE ARP908. Afterward proof pressure as specified in 4.6.4. After disassembly, the fittings shall show
no evidence of permanent deformation and the swivel nuts shall be free to turn by hand. SAE AS4395
and AS33514 are the mating parts, not the fittings (see 4.6.13.).
3.6.4 Proof pressure. Fittings shall not leak, deform, move relative to the hose, separate from the
hose, or burst at any pressure up to the proof pressure specified in table II (see 4.6.4).
3.6.5 Leakage pressure. Fittings shall not leak, deform, move relative to the hose, separate from the
hose, or burst at any pressure up to 70 percent of the room-temperature burst pressure specified in table
II (see 4.6.5).
TABLE II. Fitting performance requirements and hose assembly test sample lengths.
Burst pressure,
Length of
Length of
Minimum
Burst pressure,
Proof
room temp.
Operating
samples for
samples for
inside bend
high temp
Fitting size
pressure
(60 - 90°F)
pressure (psi)
impulse test
other tests
radius
(psi min)
(psi min)
(inches)
(inches)
(inches)
(psi min)
-3/-4
14
18
1,500
3,000
12,000
7,000
2.00
-4
14
18
1,500
3,000
12,000
7,000
2.00
-5
16
18
1,500
3,000
10,000
6,500
2.00
-6
18
18
1,500
3,000
9,000
6,500
4.00
-8
21
18
1,500
3,000
8,000
6,000
4.60
-10
23.5
18
1,500
3,000
7,000
5,500
5.50
-12
27.5
18
1,000
2,000
5,000
3,500
6.50
-16Z
18
18
1,250
2,500
5,000
3,500
7.40
-20Z
18
18
1,000
2,000
4,000
3,000
11.00
-24Z
18
18
1,000
2,000
4,000
3,000
14.00
5
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