Standard: GB 871 - 1986
Available sizes: (Φ1.2) to Φ3 (6 sizes)
| Size | P | k_max | k_min | s_max | s_min | ds_max | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|
| (Φ1.2) | 1.46 | 0.7 | 0.5 | 1.34 | 3 | 1.9 | 2.6 | 0.1 |
| (Φ1.6) | 3.06 | 1.2 | 0.8 | 2.94 | 6.24 | 5 | 5.76 | 0.1 |
| Φ1.4 | 2.06 | 0.9 | 0.7 | 1.94 | 4.24 | 2.9 | 3.76 | 0.1 |
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.
| Φ2 | 4.08 | 1.5 | 1.1 | 3.92 | 8.29 | 6.8 | 7.71 | 0.3 |
| Φ2.5 | 6.08 | 2.4 | 2 | 5.92 | 12.35 | 9.3 | 11.65 | 0.3 |
| Φ3 | 10.1 | 4.24 | 3.76 | 9.9 | 20.42 | 14.5 | 19.58 | 0.3 |
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.