Standard: SAE J 531
Available sizes: 1/16 to 3/8 (4 sizes)
| Size | P | k_min | s_max | s_min | ds_max | ds_min | ds_nominal |
|---|---|---|---|---|---|---|---|
| 1/16 | 27 | 4.90 | 7.11 | 0.280 | 1.5 | 0.06 | 0.193 |
| 1/4 | 14 | 14.43 | 14.48 | 0.570 | 2.3 | 0.09 | 0.568 |
| 1/8 | 18 | 8.08 | 10.80 | 0.425 | 1.5 | 0.06 | 0.318 |
| 3/8 | 11-1/2 | 16.00 | 18.03 | 0.710 | 3 | 0.12 | 0.630 |
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.
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.