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MIL-DTL-18240 Fastener Element, Self-Locking, Threaded Fastener, 250 Degrees F MaximumThis specification defines the requirements for self-locking elements for use in externally threaded fasteners such as bolts and screws to be used in fasteners with either UNC, UNJC, UNF, UNJF, UNRC or UNRF threads and where the temperatures will not exceed 250 deg. F.

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MIL-DTL-18240F
TABLE II Torque. 1/ 3/
PREVAILING
PREVAILING
TORQUE MAX.
TORQUE MIN.
Bolt, or screw
SEATING
thread size
TORQUE
ON OR OFF
ON OR OFF
inch-pound ±10%
inch-pound
inch-pound
2/
.112
8.0
5.0
.5
.138
15.0
8.0
1.0
.164
28.0
12.0
1.5
.190
45.0
18.0
2.0
.250
110.0
40.0
3.0
.312
190.0
85.0
5.0
.375
345.0
110.0
9.0
.437
545.0
150.0
12.0
.500
850.0
220.0
16.0
.562
1,050.0
270.0
22.0
.625
1,450.0
350.0
30.0
.750
2,560.0
460.0
45.0
.875
4,180.0
700.0
65.0
1.000
6,230.0
900.0
85.0
1.125
7,800.0
1050.0
110.0
1.250
11,200.0
1150.0
140.0
1/ These values apply to MIL-S-8879, MIL-S-7742, ASME B1.1, and FED-STD-H28/2
threads. They do not apply to Class 1A threads.
2/ These values are for testing only, and are NOT recommended installation torque values.
3/ Values for coarse and fine threads are the same.
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