Standard: JIS B 1181 - 2014
Available sizes: (M3.5) to M6 (8 sizes)
| Size | P | e | r | k_max | k_min | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|
| (M3.5) | 1 | 10 | 10.8 | 4.2 | 3.9 | 5.5 | 10.75 | 12.7 | 5.2 | 11 |
| (M7) | 2.5 | 28.5 | 29 | 12 | 11.57 | 16 | 29.65 | 34.6 | 15.57 | 30 |
| M2 | 0.45 | — |
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.
| 4.7 |
| 1.6 |
| 1.35 |
| 2 |
| 4.8 |
| 5.8 |
| 1.75 |
| 5 |
| M2.5 | 0.6 | — | 5.8 | 2 | 1.75 | 2.8 | 5.8 | 6.9 | 2.55 | 6 |
| M3 | 0.8 | 7.2 | 7.8 | 3.2 | 2.9 | 4 | 7.8 | 9.2 | 3.7 | 8 |
| M4 | 1.5 | 15.8 | 16.5 | 6 | 5.7 | 8 | 16.75 | 19.6 | 7.64 | 17 |
| M5 | 2 | 20.4 | 21 | 8 | 7.64 | 11 | 21.65 | 25.4 | 10.57 | 22 |
| M6 | 2.5 | 25.6 | 26 | 11 | 10.57 | 15 | 26.65 | 31.2 | 14.57 | 27 |
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.