Tightening torque, stainless steel/acid-resistant bolted joint –
metric coarse thread

The following table specifies values for tightening torque for waxed products.Consideration has been given to the fact that the tensile strength values according to SS-ISO 3506-1 for stainless steel bolts do not correspond with the values for normal steel bolts.

For stainless steel bolts (including acid-resistant bolts) to be prestressed, effective lubrication is required.Without lubrication, the threads can seize.
Striking machines must not be used when tightening stainless steel joints.

Tightening torque (Mv) in Nm applies to waxed stainless steel (including acid-resistant) bolted joints when using a torque wrench or screwdriver/impact wrench with torque control.Torque variation max. ±5%.

Note! Table does not apply for High-strength structural bolting assemblies acc with EN 14399-1, instructions can be found in EN 1090-2

Thread
M
Diameter 

mm
Pitch
P
mm
Stress area
As
mm²
Property class according to SS-ISO 3506-1
Austenitic  (A) Ferritic (F) and Martensitic  (C)
50 70 80 45 50 60 70 80
1,6
2
2,5
1,6
2
2,5
0,35
0,4
0,45
1,27
2,07
3,39
0,057
0,11
0,23
0,12
0,25
0,5
0,16
0,33
0,28
0,068
0,14
0,28
0,11
0,22
0,45
0,17
0,35
0,7
3
3,5
4
3
3,5
4
0,5
0,6
0,7
5,03
6,78
8,78
0,41
0,64
1
0,87
1,4
2
1,2
1,8
2,7
0,48
0,76
1,1
0,79
1,3
1,9
1,2
2
2,9
5
6
8
5
6
8
0,8
1
1,25
14,2
20,1
36,6
1,9
3,3
7,8
4,1
7
17
5,4
9,3
22
2,3
3,9
9,3
3,7
6,3
15
5,8
9,9
24
10
12
14
10
12
14
1,5
1,75
2
58
84,3
115
15
27
43
33
57
91
44
76
121
18
32
51
30
52
83
47
82
130
16
18
20
16
18
20
2
2,5
2,5
157
192
245
65
91
127
140
195
273
187
260
364
78
108
152
127
178
249
199
277
388
22
24
27
22
24
27
2,5
3
3
303
353
459
171
220
318
367
472
682
490
629
909
204
262
379
335
430
621
523
671
969
30
33
36
39
30
33
36
39
3,5
3,5
4
4
561
694
817
976
434
585
755
969
930
1250
1620
2080
1240
1670
2160
2770
517
697
899
1150
848
1140
1470
1890
1320
1780
2300
2950
σs = ReL eller Rp0,2 N/mm² nominal 210 450 600 250 410 640
 x σs N/mm² 23,1 49,5 66 27,5 45,1 70,4