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General Torque Specifications
(rev. 4/97)
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 capscrews 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 capscrews. Use value in [ ] if using prevailing torque nuts
TORQUE SPECIFIED IN FOOT POUNDS
UNC
SAE
SIZE
Grade 2
1/4-20
4
[5]
5/16-18
8
[10]
3/8-16
15 [19]
7/16-14
24 [30]
1/2-13
35 [43]
9/16-12
55 [62]
5/8-11
75 [94]
3/4/10
130 [162]
7/8-9
125 [156]
1-8
190 [237]
1-1/8-7
270 [337]
1-1/4-7
380 [475]
1-3/8-6
490 [612]
1-1/2-6
650 [812]
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
Newton Meters
thread
diameter (mm)
6
10 [14]
7
16 [22]
8
23 [32]
10
46 [60]
12
80 [125]
14
125 [155]
16
200 [240]
18
275 [330]
F-661R4
SAE
Grade 5
Grade 8
6
[7]
9 [11]
13 [13]
18 [22]
23 [29]
35 [42]
35 [43]
55 [62]
55 [62]
80 [100]
80 [100]
110 [137]
110 [137]
170 [212]
200 [250]
280 [350]
320 [400]
460 [575]
408 [506]
680 [850]
600 [750]
960 [1200]
840 [1050
1426 [1782]
1010 [1375]
1780 [2225]
1460 [1825]
2360 [2950]
Foot Pounds
(Standard
(Standard
Torque)
Torque)
7 [10]
12 [16]
17 [24]
34 [47]
60 [75]
90 [115]
150 [180]
205 [245]
SAE
UNF
SIZE
1/4-28
5/16-24
3/8-24
7/16-20
1/2-20
9/16-18
5/8-18
3/4-16
7/8-14
1-14
1-1/8-12
1-1/4-12
1-3/8-12
1-1/2-12
Nominal Thread
Diameter (mm)
20
24
27
30
33
36
39
Maintenance
SAE
SAE
Grade 2
Grade 5
5 [6]
7 [9]
9 [11]
14 [17]
17 [21]
25 [31]
27 [34]
40 [50]
40 [50]
65 [81]
60 [75]
90 [112]
85 [106]
130 [162]
150 [188]
220 [275]
140 [175]
360 [450]
210 [263]
540 [675]
300 [375]
660 [825]
420 [525]
920 [1150]
560 [700]
1260[1575]
730 [912]
1640[2050]
Newton Meters
(Standard
Torque)
385 [450]
670 [775]
980 [1105]
1330 [1470]
1790 [1950]
2325 [2515]
3010 [3210]
Chapter 4
SAE
Grade 8
10 [12]
20 [25]
35 [44]
60 [75]
90 [112]
130 [162]
180 [225]
320 [400]
500 [625]
760 [950]
1080 [1350]
1500 [1875]
2010 [2512]
2660 [3325]
Foot Pounds
(Standard
Torque
290 [335]
500 [625]
730 [825]
990 [1090]
1340 [1450]
1730 [1870]
2240 [2380]
4-1
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