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 | - |