Stainless steel/acid-resistant joint
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 |