Standard: DIN 6904 - 1990
Available sizes: M2.5 to M4 (4 sizes)
| Size | P | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|
| M2.5 | 2.7 | 0.17 | 0.5 | 0.55 | 2.8 | 8 | 1.05 | 0.9 | 7.78 | 0.45 |
| M3 | 3.6 | 0.34 | 0.8 | 0.86 | 3.72 | 9 | 1.65 | 1.5 | 8.78 |
| 0.74 |
| M3.5 | 5.4 | 0.57 | 0.8 | 0.86 | 5.52 | 12 | 2 | 1.85 | 11.73 | 0.74 |
| M4 | 9.2 | 2.20 | 1 | 1.07 | 9.35 | 21 | 2.6 | 2.4 | 20.67 | 0.93 |
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.