Standard: GB 877 - 1986
Available sizes: Φ3 to Φ6 (4 sizes)
| Size | P | k_max | k_min | s_max | s_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|
| Φ3 | 3.952 | 1 | 10 | 4 | 0.8 | 0.86 | 0.5 |
| Φ4 | 5.952 | 1.2 | 15 | 6 | 1 | 1.06 | 1 |
| Φ5 | 9.942 | 1.91 | 25 | 10 | 1.6 | 1.66 | 1.5 |
| Φ6 | 15.93 | 2.31 | 40 |
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.
| 16 |
| 2 |
| 2.06 |
| 1.5 |
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.