Standard: GB /T 798 - 2021
Available sizes: M10 to M8 (5 sizes)
| Size | P | e | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|---|
| M10 | 3 | 43.4 | 45 | 22 | 22.11 | 54 | 60 | 22.11 | 22.32 | 73 | 22.24 |
| M12 | 3 | 48.4 | 50 | 24 | 24.11 | 60 | 66 | 24.11 | 24.32 | 79 | 24.24 |
Standard corrosion protection for indoor and mild outdoor environments.
Salt spray: 96–200 hours | RoHS compliant (trivalent chromium)
High-performance coating for automotive, marine, and harsh environments.
Salt spray: 720–1500 hours | Recommended for grade 8.8+
Heavy-duty protection for structural and outdoor applications.
Salt spray: 500–1000 hours | Thread tolerance adjustment required
Note for high-strength fasteners (Grade 10.9, 12.9): Electroplating processes require hydrogen embrittlement relief baking (minimum 4 hours at 200°C within 4 hours of plating). Contact our engineering team for grade-specific plating recommendations.
Request detailed technical specifications, material certifications, and availability information for your application requirements. Our engineering team can provide product recommendations, custom specifications, and technical documentation.
| M5 |
| 1 |
| 12.9 |
| 14 |
| 6 |
| 6.07 |
| 18 |
| — |
| 6.07 |
| 6.19 |
| — |
| 6.145 |
| M6 | 1.5 | 18.7 | 20 | 10 | 10.08 | 26 | 32 | 10.08 | 10.23 | — | 10.17 |
| M8 | 2 | 30.4 | 32 | 16 | 16.095 | 38 | 44 | 16.095 | 16.275 | 57 | 16.205 |
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.