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Nut Marking Requirements

Grade and Type Nuts Hot-Forged or Cold-Punched Nuts Machined from Bar Stock Nuts Manufactured in Accordance with 6.6
1 1 1B -
2 2 2B -
2HB 2H 2HB -
2HMB 2HM 2HMB -
3 3 3B -
4 4 4B -
4LC 4L 4BL -
6 6 6B -
6F 6F 6FB -
7 7 7B -
7LC 7L 7BL -
7MB 7M 7MB -
8 8 8B 8A
8C 8C 8CB 8CA
8M 8M 8MB 8MA
8T 8T 8TB 8TA
8F 8F 8FB 8FA
8P 8P 8PB 8PA
8N 8N 8NB 8NA
8MN 8MN 8MNB 8MNA
8R 8R 8RB 8RA
8S 8S 8SB 8SA
8LN 8LN 8LNB 8LNA
8MLN 8MLN 8MLNB 8MLNA
8MLCuN 8MLCuN 8MLCuNB 8MLCuNA
9C 9C 9CB 9CA
16 16 16B -
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