Standard: GB 9457 - 1988
Available sizes: (M14) to M8 (7 sizes)
| Size | P | e | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|---|
| (M14) | 1.5 | 33 | 34 | 37.29 | 27.4 | / | 30 | 6.7 | 5.5 | 29.16 | 26.56 |
| (M18) | 2 | 49 | 50 | 55.37 | 37.7 | / | 46 |
| 8.5 |
| 7 |
| 45 |
| 36.7 |
| M10 | 1.5 | 20.67 | 21 | 23.36 | 17.8 | / | / | 4.25 | 3.5 | / | 17.37 |
| M12 | 1.5 | 26.16 | 27 | 29.56 | 21.8 | / | 25 | 5.7 | 4.5 | 24.16 | 20.96 |
| M16 | 2 | 40 | 41 | 45.2 | 31.8 | / | 38 | 6.7 | 5.5 | 37 | 30.8 |
| M20 | 3 | 53.8 | 55 | 60.79 | 40 | / | 50 | 8.5 | 7 | 49 | 39 |
| M8 | 1 | 15.73 | 16 | 17.77 | 12.4 | （1.25） | / | 3.4 | 2.8 | / | 11.97 |
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.
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.