31May
Introduction to Torque Part 4
Recommended Maximum Torque Values
The information supplied here is intended to be an acceptable guide for normal conditions. For critical applications, further information and research will be necessary. The following basic assumptions have been made:
a. Bolts are new, standard finish, uncoated and not lubricated (other than the normal protective oil film)
b. The load will be 90% of the bolt yield strength
c. The coefficient of friction is 0.14
d. The final tightening sequence is achieved smoothly and slowly
If lubrication is to be applied to the nut/bolt, multiply the recommended torque by the appropriate factor shown in the table on intro to torque part 2. Alternatively, use the Torque/Tension Calculator which enables fastener and friction conditions to be modified with ease.
|
Â
M
|
BOLT GRADE
|
Â
mm
|
|
3.6
|
4.6
|
5.6
|
5.8
|
6.8
|
8.8
|
9.8
|
10.9
|
12.9
|
|
Torque in N·m
|
|
M 1.6
|
0.05
|
0.07
|
0.09
|
0.11
|
0.14
|
0.18
|
0.21
|
0.26
|
0.31
|
3.2
|
|
M 2
|
0.11
|
0.14
|
0.18
|
0.24
|
0.28
|
0.38
|
0.42
|
0.53
|
0.63
|
4
|
|
M 2.5
|
0.22
|
0.29
|
0.36
|
0.48
|
0.58
|
0.78
|
0.87
|
1.09
|
1.31
|
5
|
|
M 3
|
0.38
|
0.51
|
0.63
|
0.84
|
1.01
|
1.35
|
1.52
|
1.9
|
2.27
|
5.5
|
|
M 4
|
0.71
|
0.95
|
1.19
|
1.59
|
1.91
|
2.54
|
2.86
|
3.57
|
4.29
|
7
|
|
M 5
|
1.71
|
2.28
|
2.85
|
3.8
|
4.56
|
6.09
|
6.85
|
8.56
|
10.3
|
8
|
|
M 6
|
2.94
|
3.92
|
4.91
|
6.54
|
7.85
|
10.5
|
11.8
|
14.7
|
17.7
|
10
|
|
M 8
|
7.11
|
9.48
|
11.9
|
15.8
|
19
|
25.3
|
28.4
|
35.5
|
42.7
|
13
|
|
M 10
|
14.3
|
19.1
|
23.8
|
31.8
|
38.1
|
50.8
|
57.2
|
71.5
|
85.8
|
17
|
|
M 12
|
24.4
|
32.6
|
40.7
|
54.3
|
65.1
|
86.9
|
97.9
|
122
|
147
|
19
|
|
M 14
|
39
|
52
|
65
|
86.6
|
104
|
139
|
156
|
195
|
234
|
22
|
|
M 16
|
59.9
|
79.9
|
99.8
|
133
|
160
|
213
|
240
|
299
|
359
|
24
|
|
M 18
|
82.5
|
110
|
138
|
183
|
220
|
293
|
330
|
413
|
495
|
27
|
|
M 20
|
117
|
156
|
195
|
260
|
312
|
416
|
468
|
585
|
702
|
30
|
|
M 22
|
158
|
211
|
264
|
352
|
422
|
563
|
634
|
792
|
950
|
32
|
|
M 24
|
202
|
270
|
337
|
449
|
539
|
719
|
809
|
1,011
|
1,213
|
36
|
|
M 27
|
298
|
398
|
497
|
663
|
795
|
1,060
|
1,193
|
1,491
|
1,789
|
41
|
|
M 30
|
405
|
540
|
675
|
900
|
1,080
|
1,440
|
1,620
|
2,025
|
2,430
|
46
|
|
M 33
|
550
|
734
|
917
|
1,223
|
1,467
|
1,956
|
2,201
|
2,751
|
3,301
|
50
|
|
M 36
|
708
|
944
|
1,180
|
1,573
|
1,888
|
2,517
|
2,832
|
3,540
|
4,248
|
55
|
|
M 39
|
919
|
1,226
|
1,532
|
2,043
|
2,452
|
3,269
|
3,678
|
4,597
|
5,517
|
60
|
|
M 42
|
1,139
|
1,518
|
1,898
|
2,530
|
3,036
|
4,049
|
4,555
|
5,693
|
6,832
|
65
|
|
M 45
|
1,425
|
1,900
|
2,375
|
3,167
|
3,800
|
5,067
|
5,701
|
7,126
|
8,551
|
70
|
|
M 48
|
1,716
|
2,288
|
2,860
|
3,813
|
4,576
|
6,101
|
6,864
|
8,580
|
10,296
|
75
|
|
M 52
|
2,210
|
2,947
|
3,684
|
4,912
|
5,895
|
7,859
|
8,842
|
11,052
|
13,263
|
80
|
|
M 56
|
2,737
|
3,650
|
4,562
|
6,083
|
7,300
|
9,733
|
10,950
|
13,687
|
16,425
|
85
|
|
M 60
|
3,404
|
4,538
|
5,673
|
7,564
|
9,076
|
12,102
|
13,614
|
17,018
|
20,422
|
90
|
|
M 64
|
4,100
|
5,466
|
6,833
|
9,110
|
10,932
|
14,576
|
16,398
|
20,498
|
24,597
|
95
|
|
M 68
|
4,963
|
6,617
|
8,271
|
11,029
|
13,234
|
17,646
|
19,851
|
24,814
|
29,777
|
100
|