TM 55-1560-307-13&P
Table F-2. Recommended Torque Values
Fine Thread
Plain & Castellated
Thin Plain & Castellated
Steel Hex Nuts
Steel Hex Nuts
Size
Used with Bolts in
Used with Bolts in
and
Note (8) Tension
Note (8) Shear
Thread
Loading
Loading
Average
Average
NO.
6-40
10.2-11.2
9.5-10.5
8-36
12-15
7-9
10-32
20-25
12-15
1/4-28
50-70
30-40
5/16-24
100-140
60-85
3/8-24
160-190
95-110
7/16-20
450-500
270-300
1/2-20
480-690
290-410
9/16-18
800-1000
480-600
5/8-18
1100-1300
600-780
3/4-16
2300-2500
1300-1500
7/8-14
2500-3000
1500-1800
Coarse Thread
NO.
6-32
8.2-9.2
7.8-8.8
8-32
12-15
7-9
10-24
20-25
12-15
1/4-20
40-50
25-30
5/16-18
80-90
48-55
3/8-16
160-185
95-100
7/16-14
235-255
140-155
1/2-13
400-480
240-290
9/16-12
500-700
300-420
5/8-11
700-900
420-540
3/4-10
1150-1600
700-950
7/8-9
2200-3000
1300-1800
NOTES:
1.
THE ABOVE TORQUE LOADS MAY BE USED FOR ALL CADMIUM-PLATED STEEL NUTS OF THE FINE OR
COARSE THREAD SERIES WHICH HAVE APPROXIMATELY EQUAL NUMBER OF THREADS AND EQUAL
BEARING AREAS.
2.
TORQUE VALUES ARE IN INCH-POUNDS.
3.
TORQUE VALUES ARE NOMINAL AND MAY NOT AGREE WITH SPECIFIC AIRCRAFT OR ENGINE
MAINTENANCE MANUALS. TORQUE VALUES CITED IN SPECIFIC MANUALS ARE CORRECT FOR
INDIVIDUAL APPLICATION.
4.
SIZE REFERS TO BOLT SHANK DIAMETER OR INSIDE DIAMETER OF NUT AND THREAD INDICATES
NUMBER OF THREADS PER INCH.
5.
TORQUE VALUES ARE DERIVED FROM OIL-FREE CADMIUM-PLATED THREADS.
6.
ALL TORQUE VALUES ARE BASED ON USE OF 125 KSI BOLTS.
7.
AVERAGE TORQUE VALUES IN SHEAR LOADING ARE APPROXIMATELY 60% OF AVERAGE TORQUE
VALUE IN TENSION LOADING.
8.
TORQUE VALUES ARE APPLICABLE TO SELF-LOCKING NUTS AS WELL. (REFERENCE TABLE F-1.)
F-3/(F-4 Blank)
