STANDARD SPECIFICATIONS
2-3
General Torque
Specifications (rev. 4/97)
Table 2-1: General Torque Specifications
TORQUE SPECIFIED IN FOOT POUNDS -
This chart provides tightening torques for general purpose applications
when special torques are not specified on process or drawing. Assembly torques apply to plated nuts and cap-screws
assembled without supplemental lubrication (as received condition). They do not apply if special graphite moly-disulfide or
other extreme pressure lubricants are used. When fasteners are dry (solvent cleaned) add 33% to as received condition
torque. Bolt head identification marks indicate grade and may vary from manufacturer to manufacturer. Thick nuts must be
used on grade 8 cap-screws. Use value in [ ] if using prevailing torque nuts.
UNC
SIZE
SAE
Grade 2
SAE
Grade 5
SAE
Grade 8
UNF
SIZE
SAE
Grade 2
SAE
Grade 5
SAE
Grade 8
1/4-20
4
[5]
6
[7]
9
[11]
1/4-28
5
[6]
7
[9]
10
[12]
5/16-18
8
[10]
13
[13]
18
[22]
5/16-24
9
[11]
14
[17]
20
[25]
3/8-16
15
[19]
23
[29]
35
[42]
3/8-24
17
[21]
25
[31]
35
[44]
7/16-14
24
[30]
35
[43]
55
[62]
7/16-20
27
[34]
40
[50]
60
[75]
1/2-13
35
[43]
55
[62]
80
[100]
1/2-20
40
[50]
65
[81]
90
[112]
9/16-12
55
[62]
80
[100]
110
[137]
9/16-18
60
[75]
90
[112]
130
[162]
5/8-11
75
[94]
110
[137]
170
[212]
5/8-18
85
[106]
130
[162]
180
[225]
3/4-10
130
[162]
200
[250]
280
[350]
3/4-16
150
[188]
220
[275]
320
[400]
7/8-9
125
[156]
320
[400]
460
[575]
7/8-14
140
[175]
360
[450]
500
[625]
1-8
190
[237]
408
[506]
680
[850]
1-14
210
[263]
540
[675]
760
[950]
1-1/8-7
270
[337]
600
[750]
960
[1200]
1-1/8-12
300
[375]
660
[825]
1080
[1350]
1-1/4-7
380
[475]
840
[1050
1426
[1782]
1-1/4-12
420
[525]
920
[1150]
1500
[1875]
1-3/8-6
490
[612]
1010
[1375]
1780
[2225]
1-3/8-12
560
[700]
1260
[1575]
2010
[2512]
1-1/2-6
650
[812]
1460
[1825]
2360
[2950]
1-1/2-12
730
[912]
1640
[2050]
2660
[3325]
1-3/4-5
736
[920]
1651
[2063]
2678
[3347]
1-3/4-12
920
[1150]
2063
[2579]
3347
[4183]
METRIC:
Coarse thread metric class 10.9 fasteners and class 10.0 nuts and through hardened flat washers, phosphate coated,
Rockwell “C” 38-45. Use value in [ ] if using prevailing torque nuts.
Nominal
thread
diameter
(mm)
Newton
Meters
(Standard
Torque)
Foot Pounds
(Standard
Torque)
Nominal
Thread
Diameter
(mm)
Newton
Meters
(Standard
Torque)
Foot Pounds
(Standard
Torque
6
10
[14]
7
[10]
20
385
[450]
290
[335]
7
16
[22]
12
[16]
24
670
[775]
500
[625]
8
23
[32]
17
[24]
27
980
[1105]
730
[825]
10
46
[60]
34
[47]
30
1330
[1470]
990
[1090]
12
80
[125]
60
[75]
33
1790
[1950]
1340
[1450]
14
125
[155]
90
[115]
36
2325
[2515]
1730
[1870]
16
200
[240]
150
[180]
39
3010
[3210]
2240
[2380]
18
275
[330]
205
[245]
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