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Standard Torque Limits in Inch-Pounds for Threaded Fasteners | Up
TM-55-1520-240-23-1 UH-1H/V and EH-1H Aircraft Manual | Next
Standard Torque Limits in Inch-Pounds for Hose and Tube Coupling Nuts TABLE |
TM 55-1520-240-23-1
1-13
STANDARD TORQUE LIMIT APPLICATION
(Continued)
1-13
NOTES
1.
Torque limits apply to nut tightening only. When tightening bolt, the higher limit ± 10 percent is used.
2.
Torque values are for dry (unlubricated) threads. It threads are lubricated, limit is 70 percent of unlubricated value.
3.
Maximum torque allowed for cotter pin hole alignment. If limit is exceeded, discard nut and bolt and inspect parts secured by the
nut and bolt.
4.
Torque limits apply only to tightening nut on stud.
5.
When tightening self-locking castellated nut MS21224, MS17825, and MS17826, first tighten to minimum torque. If slot in nut is
aligned with cotter pin hole in bolt, tighten nut an additional 60º (one castellation) and install cotter pin. If slot in nut is not aligned with
cotter pin hole in bolt, tighten nut until aligned and install cotter pin. In either case maximum torque must not be exceeded.
Do not apply antiseize compound to bolt or nut threads.
6.
Apply a coating of antiseize compound (E75) or equivalent to the bushing OD on bolts 114R3650 series only.
Friction Torque in Inch-Pounds for Threaded Fasteners
THREAD SIZE
MINIMUM
FRICTION TORQUE
8 - 32
1.5
10 - 32
2.0
1/4 - 28
3.5
5/16 - 24
6.5
3/8 - 24
9.5
7/16 - 20
14.0
1/2 - 20
18.0
9/16 - 18
24.0
5/8 - 18
32.0
3/4 - 16
50.0
7/8 - 14
70.0
1 - 12
90.0
1-1/8 - 12
117.0
1-1/4 - 12
143.0
NOTE
To determine friction torque, thread the nut onto the screw or bolt until at least two
threads protrude. The nut shall not make contact with a mating part. Stop the nut. The
torque necessary to begin turning the nut again is the breakaway torque. Do not reuse
self-locking nuts that do not meet minimum friction torque.
TORQUE WRENCHES
5 to 50 Inch-Pounds
30 to 150 Inch-Pounds
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