Torque figures for bolts and screws with metric thread and head dimensions, as in DIN 912, 931, 934 etc.
The figures MA in this table include: a)coefficient of friction microns total + 0.14 b)90% of minimum elongation c)torque figures when assembling fasteners
The coefficient of friction of microns total = 0.14 applies for fasteners without coating (self colour) when slighty lubricated.
Additional lubrication of the thread will substantially alter the coefficient of friction, leading to uncontrollable pre-load situations.
Pre-load situations will also be influenced by the fastening methods and tools used.
The following figures are guidelines only.
Figures in NM(Newton Meters)
Tightening Torques (For Metric Coarse Thread Bolts and Screws) Based on coefficients of friction total of 0.100
Thread Diameter
Property Classes
4.6
5.6
8.8
10.9
12.9
M4
1.02
1.37
3.0
4.4
5
M5
2.00
2.70
5.9
8.7
10
M6
3.50
4.60
10
15
18
M8
8.40
11
25
36
43
M10
17
22
49
72
84
M12
29
39
85
125
145
M14
46
62
135
200
235
M16
71
95
210
310
365
M18
97
130
300
430
500
M20
138
184
425
610
710
M22
186
250
580
820
960
M24
235
315
730
1,050
1,220
M27
350
470
1,100
1,550
1,800
M30
475
3635
1,450
2,100
2,450
M33
645
8865
1,970
2,770
3,330
M36
830
1,111
2,530
3,560
4,280
Tightening Torques (For Metric Fine Thread Bolts and Screws) Based on coefficients of friction total of 0.100
Thread Diameter
Tightening Torque MA max (Nm)
Property Classes
8.8
10.9
12.9
M8 x 1.00
22
30
36
M10 x 1.25
42
59
71
M12 x 1.25
76
105
130
M14 x 1.50
120
165
200
M16 x 1.50
180
250
300
M18 x 1.50
260
365
435
M20 x 1.50
360
510
610
M22 x 1.50
480
680
810
M24 x 2.00
610
860
1,050
Conversion Figures To get NCM from Nm Nm x 100 To get inch pounds from Ncm Ncm x 0.08851 To get foot pounds from Ncm Ncm x 0.00737 To get foot pounds from NM Nm x 0.7376
