Standard: GB /T 9074.5 - 2004
Available sizes: (M3.5) to M3 (4 sizes)
| Size | P | e | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|---|
| (M3.5) | 1.25 | 1.99 | 1.68 | 1.6 | 2 | 2.5 | 8.4 | 16 | 24 | 1.6 | 15 |
| M2 | 0.45 | 0.114 | 0.074 | 0.6 | 0.6 | 0.9 | 2.8 |
| 6 |
| 8 |
| 0.6 |
| 5 |
| M2.5 | 0.6 | 0.265 | 0.191 | 0.8 | 0.8 | 1.2 | 3.7 | 8 | 11 | 0.8 | 7 |
| M3 | 0.8 | 0.489 | 0.372 | 1 | 1 | 1.6 | 5.2 | 10 | 15 | 1 | 9 |
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.