Technical information

Weldability of materials

Basic material Bolt material 4.8* Bolt material A2-50* Bolt material CU Zn 37 (Ms63) Bolt material Al Mg
Steel to 0.35% C ++ o ++ -
Steel to 0.60% C - o - -
Sheet steel, galvanised, max. 30 µ o o ++ -

CrNi steels, austenitic

o ++ o -

CU Zn (Ms63), lead-free

o o o -

AlMg3

- - - ++

++ Well suited, o Sufficiently suited up to Ø 5 mm, - Not suitable for welding, * Suitable for welding

Approved tightening torques (N x cm)

Thread

Asp (mm²)

4.8 A2-50 CuZn37 AlMg3
M3 5.03 80 50 60 40
M4 8.78 180 110 130 90
M5 14.20 360 230 270 190

M6

20.10 610 380 450 310

M8

36.60 1500 950 1100 750

According to DVS 0904, related to the torsion limit (torque). Asp = Cross-sectional area of the thread

Limit tensile force to DIN 18800-1, without deformation for PT, UT and IT

Material Note Standard Mechanical properties
4.8

Studs made of non-alloy steels are suitable for welding if there is a small amount of hardening. (C < 0.18%). Bolts made of machining steel are not suitable for welding.

EN 20898-1

Rm > 420 N/mm²
ReH > 340 N/mm²
A5 > 14 %

A2-50 Studs made of rustproof steels are usually suitable for welding, whilst those made of machining steels are not.

EN ISO 3506-3

Rm > 500 N/mm²
ReH > 340 N/mm²
AL > 0.6 d

CuZn37

  ISO 426-1
ISO 1638

Rm > 370 N/mm²

EN AW-AlMg3

 

EN 573-3

Rm > 180 N/mm²

NR, d = ASP x fu, b, k/(1.25xym) · fu,b,k = Rm · This data can only supply guide values, as the torque and minimum break load are dependent on the strength (thickness) and stability of the base material.