Standard: GB /T 898 - 1988
Available sizes: M10 to M8 (5 sizes)
| Size | P | k_max | k_min | s_max | s_min | k_nominal |
|---|---|---|---|---|---|---|
| M10 | 2.5 | 18 | 17.57 | 22 | 20.95 | 23.05 |
| M12 | 2.5 | 20 | 19.48 | 25 | 23.95 | 26.05 |
| M5 | 1 | 6 | 5.7 | 8 | 7.25 | 8.75 |
| M6 | 1.5 | 10 | 9.64 | 12 | 11.1 | 12.9 |
| M8 |
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.
| 2 |
| 14 |
| 13.57 |
| 18 |
| 17.1 |
| 18.9 |
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.