TM 5-3895-379-23-2
0284
GENERAL TORQUE VALUES - Continued
O-Ring Face Seal Fittings With SAE Inch Hex Nut and Stud End For High-Pressure Service
Recommendations - Continued
10.
Table 15 lists the O-Ring Face Seal Fittings with SAE Inch Hex Nut and Stud End Torque Values.
Table 15.
O-Ring Face Seal Fittings with SAE Inch Hex Nut and Stud End Torque Values.
Adjustable Nut Hex Size
Steel or Gray Iron
Thread Size (in.)
Straight Hex Size (in.)
(in.)
Torque lb-ft (Nm)
3/8-24
5/8
9/16
13 (18)
7/16-20
5/8
5/8
18 (24)
1/2-20
3/4
11/16
22 (30)
9/16-18
3/4
3/4
27 (37)
3/4-16
7/8
15/16
55 (75)
7/8-14
1-1/16
1-1/16
76 (103)
1-1/16-12
1-1/4
1-3/8
131 (177)
1-3/16-12
1-3/8
1-1/2
170 (231)
1-5/16-12
1-1/2
1-5/8
199 (270)
1-5/8-12
1-3/4
1-7/8
211 (286)
1-7/8-12
2-1/8
2-1/8
240 (326)
O-Ring straight, adjustable, and external hex plug with SAE inch stud end for high-pressure, above 4,000
psi (27,600 kPa) (276 bar), torque values. Tolerance is +15 -20% unless otherwise specified.
O-Ring Face Seal Fittings With Metric Hex Nut and Stud End For Standard Pressure Service
Recommendations
1.
Inspect fitting and connector sealing surfaces and the O-rings. They must be free of dirt, scratches, nicks, and
burrs. O-ring must be free of dirt, cuts, cracks, swelling or flatten condition.
2.
Back the stud end hex nut off as far as possible. Push backup washer towards the nut to fully expose the turn
down section. Washer must fit turned down section and not be too loose.
3.
Lubricate O-rings using a thin film of clean oil as needed to hold O-ring in place. Refer to LO 5-3805-294-13.
4.
Install O-ring into groove making sure it is seated at the bottom. Excess oil will prevent seating of O-ring and
cause it to pop out.
5.
To protect an O-ring from threads, wrap electrical tape over the threads. Slide O-ring over the tape into the
turned down section. Remove the tape.
03/15/2011Rel(1.8)root(torquewp)wpno(M00222)
