Standard: GB /T 29.2 - 2013
Available sizes: M4 to M5 (2 sizes)
| Size | P | e | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|---|
| M4 | 0.8 | 8 | 0.2 | 8.53 | 3.5 | 2.4 | 5.7 | 3.74 | 2.3 | 6.7 | 3.26 |
| M5 | 1.25 | 13 | 0.4 | 14.2 | 5.3 | 3.75 | 9.2 | 5.54 |
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.
| 3.5 |
| 11.4 |
| 5.06 |
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.