Standard: NF E 25
Available sizes: Φ1.5 to Φ6 (7 sizes)
| Size | P | k_max | k_min | s_max | s_min | k_nominal |
|---|---|---|---|---|---|---|
| Φ1.5 | 2 | 2.84 | +0.05 | 1.975 | 0.25 | 70° |
| Φ2 | 3 | 6.4 | ±0.05 | 2.975 | 0.4 | 70° |
| Φ2.5 | 5 | 17.6 | ±0.05 | 4.925 | 0.63 | 70° |
| Φ3 | 8 | 45.2 | ±0.05 | 7.91 |
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.
| 1 |
| 70° |
| Φ4 | 12 | 101.8 | ±0.1 | 11.89 | 1.6 | 70° |
| Φ5 | 20 | 283 | ±0.1 | 19.87 | 2.5 | 70° |
| Φ6 | 25 | 444 | ±0.1 | 24.87 | 3 | 70° |
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.