Marking required in ASTM A193/A320 for bolt and ASTM A94 for Nut.

General requirement in ASTM A962.

[1] Manufacturer’s identification symbols

[2] Grade symbols

# Material Specification Markings Symbols
1 ASTM A193 Grade B7 B7
2 ASTM A193 Grade B16 B16
3 ASTM A193 Grade B8 Cl. 2 B8SH
4 ASTM A320 Grade L7 L7
5 ASTM A193 Grade 2H 2H or 2HB
6 ASTM A193 Grade 7 7 or 7B
7 ASTM A193 Grade 8 8 or 8B


See other Material Markings.

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Disclaimer: is based on information from multiple sources and our experience with welding and inspection scopes. It is not a replacement for manufacturers directions and is only to provide reminders for inspector.

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