Standard: GB 5789 - 1986
Available sizes: M10 to M8 (4 sizes)
| Size | P | e | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|---|
| M10 | 2.5 | 22 | 19.67 | 3 | 22.4 | 46 | 52 | 43 | 20 | 65 | 25.7 |
| M5 | 1 | 6.6 | 5.82 | 1.1 | 6.8 | 18 | / |
| 14.2 |
| 6 |
| / |
| 7.4 |
| M6 | 1.5 | 11 | 9.78 | 1.5 | 11.2 | 26 | 32 | 22.3 | 10 | / | 12.6 |
| M8 | 2 | 15.5 | 13.73 | 2.1 | 15.7 | 34 | 40 | 30.5 | 14 | / | 17.7 |
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.