Standard: NF E 25
Available sizes: M12 to M22 (4 sizes)
| Size | P | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|
| M12 | 2 | 15.3 | 9.25 | 27 | 28 | 10 | 16 | 16.7 | 10.75 | 26.16 |
| M16 | 2.5 | 21.16 | 13.1 | 36 | 34 | 14 | 22 | 22.84 | 14.9 |
| 35 |
| M20 | 3 | 26.16 | 16.1 | 46 | 41 | 17 | 27 | 27.84 | 17.9 | 45 |
| M22 | 4 | 35 | 21.95 | 60 | 52 | 23 | 36 | 37 | 21.05 | 58.8 |
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.