Item

Steel Grade

ASTM

1 Bolt

Q235B

35

0Cr18Ni9

A307-B

A325-I

A193-B8, A320-B8

2 Stud

35
35CrMoA
25Cr2MoVA
0Cr18Ni9

A325-I
A193-B7, A320-L7
A193-B16
A193-B8, A320-B8

3 Nut

45

30CrMo

0Cr18Ni9

A194-2H

A194-4, A194-7

A194-8