Standard: JIS B 1252
Available sizes: (14) to 8 (7 sizes)
| Size | P | k_max | k_min | s_max | s_min | ds_max | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|
| (14) | 31 | 1 | 1.11 | 31.4 | 46 | 4.3 | 45.5 | 0.89 |
| 10 | 21 | 2 | 2.09 | 21.35 | 31 | 2.8 | 30.5 | 1.91 |
| 12 | 25 | 2.5 | 2.6 | 25.35 | 37 |
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.
| 3.5 |
| 36.5 |
| 2.4 |
| 4 | 5.3 | 0.55 | 0.59 | 5.5 | 9 | 0.85 | 8.75 | 0.51 |
| 5 | 8.4 | 0.9 | 0.95 | 8.65 | 13.5 | 1.3 | 13.2 | 0.85 |
| 6 | 13 | 1.2 | 1.265 | 13.3 | 19 | 1.75 | 18.6 | 1.135 |
| 8 | 17 | 1.6 | 1.68 | 17.3 | 25 | 2.3 | 24.6 | 1.52 |
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.