| STD | MATERIAL | CLASS | 4级，5级，8级，10级,12级 |
| GB/T889,ISO7041,ASME B 18.16.6 | 10A，35#，35CrMo，A2-70等 | ||
| PLATING | BLACK / ZINC / DARCROMET / RAW | ||
| SPECS | |||
| M4~M20 | 1/4~2 | ||
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