Standard: HB 1
Available sizes: M2.5 to M5 (4 sizes)
| Size | P | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|
| M2.5 | 2 | / | 6.1 | 0.3 | 1.75 | 6.5 | 0.1 | / | 6.35 | 0.5 |
| M3 | 3 | 3 | 8.9 | 0.5 | 2.75 | 8 | 0.3 | 1.6 | 7.85 | 0.7 |
| M4 | 5 | 4 |
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.
| 13.5 |
| 0.8 |
| 4.7 |
| 12 |
| 0.6 |
| 2 |
| 11.82 |
| 1 |
| M5 | 6 | 4 | 15.8 | 0.8 | 5.7 | 14 | 0.6 | 2.5 | 13.82 | 1 |
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.