Standard: JIS B 1181 - 2014
Available sizes: (M14) to M8 (7 sizes)
| Size | P | e | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|---|
| (M14) | 2.5 | 28.5 | 29 | 13 | 12.57 | 1.5 | 18 | 29.65 | 34.6 | 17.57 | 30 |
| (M18) | 3.5 | — | 44 | 20 | 19.48 | 2 | 26 | 45.6 |
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.
| 53.1 |
| 25.48 |
| 46 |
| M10 | 2 | 17.6 | 18 | 8 | 7.64 | 1.5 | 11 | 18.65 | 21.9 | 10.57 | 19 |
| M12 | 2.5 | 22.3 | 23 | 11 | 10.57 | 1.5 | 15 | 23.65 | 27.7 | 14.57 | 24 |
| M16 | 3 | — | 34 | 16 | 15.57 | 2 | 22 | 35.6 | 41.6 | 21.48 | 36 |
| M20 | 4 | — | 53 | 23 | 22.48 | 3 | 31 | 54.55 | 63.5 | 30.38 | 55 |
| M8 | 1.5 | 12.6 | 13.5 | 6 | 5.7 | 1.25 | 8 | 13.75 | 16.2 | 7.64 | 14 |
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.