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The table below contains tightening torques for steel bolted joints with UNC thread.

Thread
UNC
Diameter
d
mm
Pitch
P
mm
Stress area
As
mm²
Property class according to ISO-898-1:2013
4.6 5.8 8.8 10.9 12.9
No 4
No 5
No 6
2,845
3,175
3,505
0,635
0,635
0,794
3,9
5,14
5,86
0,31
0,45
0,58
0,58
0,84
1,1
0,94
1,4
1,7
1,3
1,9
2,5
1,7
2,4
3,1
No 8
No 10
No 12
4,166
4,826
5,486
0,794
1,058
1,058
9,04
11,31
15,58

1
1,5
2,3

1,9
2,9
4,4
3,1
4,6
7
4,4
6,5
10

5,5
8,1
12

1/4
5/16
3/8
6,35
7,938
9,525
1,270
1,411
1,588
20,5
33,8
50,0
3,6
7,3
13
6,7
14
24
11
22
38
15
31
54
19
38
68
7/16
1/2
9/16

11,112
12,7
14,288

1,814
1,954
2,117
68,6
91,5
117
20
31
44
38
57
82
61
93
133
87
131
187
108
163
234
5/8
3/4
7/8
15,875
19,05
22,225
2,309
2,54
2,822
146
216
298
61
107
172
114
200
320
183
322
516
259
455
729
323
568
909
1
1 1/8
1 1/4
25,4
28,575
31,75
3,175
3,629
3,629
391
492
625
257
365
509
479
679
947
772
1090
1530
1090
1550
2160
1360
1930
2690
1 3/8
1 1/2
1 3/4
34,925
38,1
44,45
4,233
4,233
5,080
745
907
1225
672
884
1400
1250
1650
2600
2020
2650
4190
2850
3750
5930
3550
4680
7390
2
2 1/4
2 1/2
50,8
57,15
63,5
5,644
5,644
6,350
1612
2095
2580
2100
3030
4150
3900
5640
7720
6290
9090
12500
8890
12800
17600
11100
16000
21900
2 3/4
3
3 1/4
69,85
76,2
82,55
6,350
6,350
6,350
3183
3850
4580
5590
7320
9380
10400
13600
17740
16800
22000
28100
23700
31000
39800
29500
38700
49600
3 1/2
3 3/4
4
88,9
95,25
101,6
6,350
6,350
6,350
5373
6230
7150
11800
14600
17800
21900
27100
33100
35400
43700
53300
50000
61800
75400
62300
77100
94000
σs = ReL eller Rp0,2 N/mm² nominal 248 393 634 896 1117
 x σs N/mm² 23,03 42,84 69,11 97,66 121,75