Steels For Screws, Bolts and Studs

Steels generally used for metric screws, bolts and studs

Property Class Size Materials per DIN 1) Materials per ANSI 1)
3.6
4.6
to M39 QSt 36-2
USt 38-2
UQSt 36-2
UQSt 38-2
1006
1010
4.8 to M16 QSt 36-2
QSt 38-2
1006
1010
5.6 to M39 Cq 22 1022
5.8 to M39 Cq 22
Cq 35
1022
1035
8.8 to M12 22B2
28B2
Cq 35
10B22
10B28
1035 (1038)
to M22 35B2
Cq 35
Cq 45
46 Cr 1
10B35
1035 (1038)
1045
over M24
to M39
34 Cr 4
37 Cr 4
46 Cr2
5132
5135
10.9 to M6 35B2
Cq 35
10B35
1035
over M6
to M18
34 Cr 4
41 Cr 4
5132
5140
to M39 41 Cr 4
34 CrMo 4
42 CrMo 4
5135
4137
4140
12.9 to M18 34 CrMo4
37 Cr 4
41 Cr 4
4137
5135
5140
to M24 42CrMo 4 4140
to M39 34 CrNiMo 6 4340
1) The above listed materials are generally used.  It is however up to the manufacturer's discretion to use any other material providing the final product meets the specified chemical composition and mechanical property.

*All information is strictly informative