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Installation and Operation Manual
E2K-405-0218 Rev. 2
A.7
Common Bolt Tightening Torques
English Units: (Coarse Thread Series)
Grade 1
Thread Size &
Tightening
Clamp Load (lb)
Pitch
Torque (ft-lb)
6 - 32
225
0.52
8 - 32
347
0.95
10 - 24
433
1.37
12 - 24
599
2.16
1/4 - 20
787
3.28
5/16 -18
1297
6.75
3/8 - 16
1918
12.0
7/16 - 14
2631
19.2
1/2 - 1 3
3512
29.3
9/16 - 12
4505
42.2
5/8 - 11
5594
58.3
3/4 - 10
8267
103
7/8 - 9
11435
167
1- 8
14999
250
1-1/8 - 7
18884
354
1-1/4 - 7
23983
500
1-3/8 - 6
28586
655
1-1/2 - 6
34774
869
Tightening Torque = K * D * P
K = 0.2 (dry, unlubricated)
Clamp Load (P) = 75% of the Proof Load
D = Nominal Thread Size
Metric Units: (Coarse Thread Series)
Class 4.6
Thread Size &
Tightening
Clamp Load (KN)
Pitch
Torque (N*m)
M6 X 1
3.41
4.09
M7 X 1
4.90
6.86
M8 X 1.25
6.20
9.93
M10 X 1.5
9.8
19.7
M12 X 1.75
14.3
34.3
M14 X 2
19.5
54.6
M16 X 2
26.6
85.2
M18 X 2.5
32.5
117
M20 X 2.5
41.5
166
M22 X 2.5
51.4
226
M24 X 3
59.8
287
M27 X 3
77.8
420
M30 X 3.5
95.1
571
M33 X 3.5
118
776
M36 X 4
138
997
M39 X 4
165
1290
Tightening Torque = K * D * P
K = 0.2 (dry, unlubricated)
Clamp Load (P) = 75% of the Proof Load
D = Nominal Thread Size
The values presented in these tables are representative and have been compiled for the user's benefit. Results can be influenced by
any number of variables including 1) excessive lubrication, 2) excessive design clamp load, 3) nicked or binding threads, 4) non-parallel
mating surfaces, and 5) inadequate torque control, to name a few. Therefore, Load expressly disclaims liability of any kind associated with
the application of the data shown herein.
Appendix
All manuals and user guides at all-guides.com
Grade 2
Tightening
Clamp Load (lb)
Torque (ft-lb)
375
0.86
578
1.58
722
2.29
998
3.59
1312
5.47
2162
11.3
3197
20.0
4385
32.0
5853
48.8
7508
70.4
9323
97.1
8267
103
11435
167
14999
250
18884
354
23983
500
28586
655
34774
869
Class 5.8
Tightening
Clamp Load (KN)
Torque (N*m)
5.73
6.87
8.24
11.5
10.4
16.7
16.5
33.1
24.0
57.7
32.8
91.8
44.7
143
54.7
197
69.8
279
86.4
380
101
483
131
706
160
959
198
1305
233
1676
278
2170
Grades 5, 5.2 & 5.1
Tightening
Clamp Load (lb)
Clamp Load (lb)
Torque (ft-lb)
579
1.33
818
893
2.44
1260
1116
3.53
1575
1543
5.55
2178
2027
8.45
2862
3341
17.4
4716
4941
30.9
6975
6777
49.4
9567
9046
75.4
12771
11603
109
16380
14408
150
20340
21293
266
30060
29453
430
41580
33633
561
54540
42347
794
68670
53780
1120
87210
64103
1469
103950
77978
1949
126450
Class 9.8
Tightening
Clamp Load (KN)
Clamp Load (KN)
Torque (N*m)
9.80
11.76
12.5
14.1
19.72
18.0
17.8
28.55
22.8
28.3
56.55
36.1
41.1
98.63
52.5
56.1
157
71.6
76.5
245
97.7
93.6
337
120
119
478
153
148
650
189
172
826
220
224
1208
286
273
1641
349
338
2233
432
398
2868
509
476
3711
608
Appendix
February 2018
Grades 8, 8.1 & 8.2
Tightening
Torque (ft-lb)
1.88
3.44
4.99
7.84
11.9
24.6
43.6
69.8
106
154
212
376
606
909
1288
1817
2382
3161
Class 10.9
Tightening
Torque (N*m)
15
25
36
72
126
200
313
430
610
830
1055
1543
2095
2851
3662
4739
89
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