The steel strength of DIN-standard bolts has a defined strength and can be put into a table:
|
Quality / Class |
Tensil strength N/mm2 |
Voltage N/mm2 |
|
4,6 |
400 |
240 |
|
5,8 |
500 |
400 |
|
8,8 |
800 |
640 |
|
10,9 |
1000 |
900 |
Breaking strength = When the bolt is pulled over.
Floating stress = When the steel begins to deform.
Calculation of the maximum voltage
The maximum load is calculated using the following formula:
Flow voltage x Voltage area
Example
M30 bolt class 10.9
Flow voltage x Voltage area
900 N / mm2 x 561 mm2 = 504900 N = 504.9 kN
1kN = 101.92 kg
The bolt's tensil strength without safety factor = 504.9 kN
|
Thread |
Nominal voltage range mm2 |
|
M3 |
5,3 |
|
M3,5 |
6,78 |
|
M4 |
8,78 |
|
M5 |
14,2 |
|
M6 |
20,1 |
|
M7 |
28,9 |
|
M8 |
36,6 |
|
M10 |
58 |
|
M12 |
84 |
|
M16 |
157 |
|
M20 |
245 |
|
M24 |
353 |
|
M30 |
561 |
|
M36 |
817 |
