Standard: BS 3692 - 2014
Available sizes: M1.6 to M6 (7 sizes)
| Size | P | k_max | s_max | s_min | k_nominal |
|---|---|---|---|---|---|
| M1.6 | 0.4 | 1.35 | 4 | 3.88 | 1.6 |
| M2 | 0.5 | 2.15 | 5.5 | 5.38 | 2.4 |
| M2.5 | 0.8 | 3.7 | 8 | 7.85 | 4 |
| M3 | 1.25 | 6.14 | 13 | 12.73 | 6.5 |
| M4 | 1.75 | 9.64 | 19 | 18.67 | 10 |
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.
| M5 | 2 | 12.57 | 24 | 23.67 | 13 |
| M6 | 2.5 | 15.57 | 30 | 29.67 | 16 |
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.