Table 3-4.—Recommended Torque Values (Inch-Pounds)
CAUTION
THE FOLLOWING TORQUE VALUES ARE DERIVED FROM
OIL FREE CADMIUM PLATED THREADS.
TORQUE LIMITS RECOMMENDED FOR
INSTALLATION (BOLTS LOADED
MAXIMUM ALLOWABLE TIGHTENING
PRIMARILY IN SHEAR)
TORQUE LIMITS
Tension type nuts
Shear type nuts
Nuts
Nuts
MS20365 and AN310
MS20364 and AN320
MS20365 and AN310
MS20364 and AN320
Tap Size
(40,000 psi in bolts)
(24,000 psi in bolts)
(90,000 psi in bolts)
(54,000 psi in bolts)
FINE THREAD SERIES
1-36
12-15
7-9
20
12
10-32
20-25
12-15
40
25
1/4-28
50-70
30-40
100
60
5/16-24
100-140
60-85
225
140
3/8-24
160-190
95-110
390
240
7/16-20
450-500
270-300
840
500
1/2-20
480-690
290-410
1100
660
9/16-18
800-1000
480-600
1600
960
5/8-18
1100-1300
600-780
2400
1400
3/4- 16
2300-2500
1300-1500
5000
3000
7/8-14
2500-3000
1500-1800
7000
4200
1-14
3700-5500
2200-3300*
10,000
6000
1-1/8-12
5000-7000
3000-4200*
15,000
1-1/4-12
9000-11,000
5400-6600*
25,000
15,000
COARSE THREAD SERIES
8-32
12-15
7-9
20
12
10-24
20-25
12-15
35
21
1/4-20
40-50
25-30
75
45
5/16-18
80-90
48-55
160
100
3/8-16
160-185
95-100
275
170
7/16-14
235-255
140-155
475
280
1/2-13
400-480
240-290
880
520
2/16-12
500-700
300-420
1100
650
5/8-11
700-900
420-540
1500
900
3/4-10
1150-1600
700-950
2500
1500
7/8-9
2200-3000
1300-1800
4600
2700
The above torque values 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 face bearing areas.
*Estimated corresponding values.
9000
The recommended torque values provided in table
alter these values considerably. The torque values must
3-4 have been established for average dry, cadmium-
be followed unless the MIM or structual repair manual
plated nuts for both the fine and coarse thread series of
for the specific aircraft requires a specific torque for a
nuts. Thread surface variations such as paint, lubri-
given nut. Torque values vary slightly with manu-
cation, hardening, plating, and thread distortion may
facturers. When the torque values are included in a
3-20
