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Appendix
February 2018
English Units: (Fine Thread Series)
Grade 1
Thread Size &
Tightening
Clamp Load (lb)
Pitch
Torque (ft-lb)
6 - 40
251
0.58
8 - 36
365
1.00
10 - 32
495
1.57
12 - 28
639
2.30
1/4 - 28
901
3.75
5/16 - 24
1436
7.48
3/8 - 24
2173
13.6
7/16 - 20
2938
21.4
1/2 - 20
3958
33.0
9/16 - 18
5024
47.1
5/8 - 18
6336
66.0
3/4 - 16
9232
115
7/8 - 14
12598
184
1 - 12
16409
273
1-1/8 - 12
21186
397
1-1/4 - 12
26557
553
1-3/8 - 12
32546
746
1-1/2 - 12
39130
978
Tightening Torque = K * D * P
K = 0.2 (dry, unlubricated)
Clamp Load (P) = 75% of the Proof Load
D = Nominal Thread Size
Metric Units: (Fine Thread Series)
Class 4.6
Thread Size &
Tightening
Clamp Load (KN)
Pitch
Torque (N*m)
M8 X1
6.64
10.6
M10 X 1.25
10.4
20.7
M12 X 1.25
15.6
37.5
M14 X 1.5
21.2
59.3
M16 X 1.5
28.3
90.6
M18 X 1.5
36.6
132
M20 X 1.5
46.1
184
M22 X 1.5
56.4
248
M24 X 2
65.1
312
M27 X 2
84.1
454
M30 X 2
105
632
M33 X 2
129
851
M36 X 3
147
1056
M39 X 3
175
1362
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.
90
All manuals and user guides at all-guides.com
Grade 2
Tightening
Clamp Load (lb)
Torque (ft-lb)
419
0.96
608
1.66
825
2.61
1064
3.83
1502
6.26
2393
12.5
3622
22.6
4896
35.7
6596
55.0
8374
78.5
10560
110
9232
115
12598
184
16409
273
21186
397
26557
553
32546
746
39130
978
Class 5.8
Tightening
Clamp Load (KN)
Torque (N*m)
11.2
17.9
17.4
34.9
26.2
63.0
35.6
100
47.6
152
61.6
222
77.5
310
94.9
418
109
525
141
763
177
1062
217
1431
247
1775
294
2290
Installation and Operation Manual
Grades 5, 5.2 & 5.1
Tightening
Clamp Load (lb)
Clamp Load (lb)
Torque (ft-lb)
647
1.49
914
940
2.57
1327
1275
4.04
1800
1645
5.92
2322
2321
9.7
3276
3698
19.3
5220
5597
35.0
7902
7567
55.2
10683
10194
84.9
14391
12941
121
18270
16320
170
23040
23779
297
33570
32449
473
45810
36797
613
59670
47508
891
77040
59552
1241
96570
72983
1673
118350
87746
2194
142290
Class 9.8
Tightening
Clamp Load (KN)
Clamp Load (KN)
Torque (N*m)
19.1
30.6
24.4
29.8
59.7
38.1
44.9
108
57.3
60.9
171
77.8
81.4
261
104
105
379
134
133
530
169
162
714
207
187
899
239
242
1306
309
303
1816
387
371
2449
474
422
3036
538
502
3917
641
E2K-405-0218 Rev. 2
Grades 8, 8.1 & 8.2
Tightening
Torque (ft-lb)
2.10
3.63
5.70
8.36
13.7
27.2
49.4
77.9
120
171
240
420
668
995
1445
2012
2712
3557
Class 10.9
Tightening
Torque (N*m)
39.0
76.2
138
218
333
484
677
912
1147
1667
2319
3127
3877
5001
Appendix
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