Standard: JIS B 1181 - 1993
Available sizes: M1.6 to M5 (7 sizes)
| Size | P | e | r | k_max | k_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|
| M1.6 | 0.4 | 1.35 | 1.6 | 0.1 | 2.3 | 3.07 | 4.32 | 0.2 | 2 |
| M2 | 0.5 | 2.15 | 2.4 | 0.15 | 3.45 | 4.57 | 6.01 | 0.4 | 3 |
| M2.5 | 0.7 | 2.9 | 3.2 | 0.15 | 4.6 | 5.88 |
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.
| 7.66 |
| 0.4 |
| 4 |
| M3 | 1 | 4.9 | 5.2 | 0.15 | 6.75 | 8.88 | 11.05 | 0.5 | 6 |
| M3.5 | 1.5 | 8.04 | 8.4 | 0.15 | 10.8 | 14.63 | 17.77 | 0.6 | 10 |
| M4 | 2 | 12.1 | 12.8 | 0.15 | 15.1 | 19.64 | 23.36 | 0.6 | 14 |
| M5 | 2 | 14.1 | 14.8 | 0.2 | 17.3 | 22.49 | 26.75 | 0.8 | 16 |
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.