Standard: QJ 3243.2 - 2005
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 | 18.8 | 18.67 | 19 | 26 | 20 | 16.4 | 17.2 | 123 | 4.7 | 24.9 | 1.9 |
| M5 | 7.1 | 7.85 | 8 | 10.6 | 8.1 | 6.3 | 7.1 | 5.5 |
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.
| 2.3 |
| 9.8 |
| 1.2 |
| M6 | 11.7 | 11.82 | 12 | 16.8 | 13 | 10.3 | 11.1 | 8.1 | 3.1 | 15.8 | 1.2 |
| M8 | 16.5 | 16.73 | 17 | 23 | 17.5 | 14.4 | 15.2 | 10.7 | 4 | 21.9 | 1.7 |
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.