Standard: CNS 4702 - 1982
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 | 3.5 | 53.1 | 30 | 37.5 | 19 | 24 | 24.2 | 46 | / | 36 | / |
| M4 | 0.8 | 9.2 | 5 | 6.5 | 3.5 | 3.7 | 3.9 |
| 8 |
| 1.7 |
| 6 |
| 1.2 |
| M5 | 1.25 | 15 | 8 | 11.8 | 5.5 | 6 | 6.2 | 13 | 2.5 | 11 | 2 |
| M6 | 1.75 | 21.9 | 12 | 17 | 8 | 9 | 9.2 | 19 | 3.5 | 16 | 3 |
| M8 | 2.5 | 34.6 | 20 | 25.5 | 13 | 16 | 16.2 | 30 | / | 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.
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.