Standard: CNS 4649 - 1978
Available sizes: 10.5 to 8.4 (4 sizes)
| Size | P | s_max | s_min | k_nominal |
|---|---|---|---|---|
| 10.5 | 50 | 6 | 76 | M20 |
| 13 | 68 | 10 | 226 | M30 |
| 6.4 | 23 | 4 | 11.3 | M8 |
| 8.4 | 35 | 5 | 32.5 | M12 |
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.