Standard: BS 3410
Available sizes: 1/2 to 7/16 (5 sizes)
| Size | P | k_max | s_max | s_min | k_nominal |
|---|---|---|---|---|---|
| 1/2 | 1.031 | 0.192 | 1.026 | 2.75 | 2.73 |
| 1/4 | 0.333 | 0.08 | 0.328 | 1.25 | 1.24 |
| 3/8 | 0.593 | 0.128 | 0.588 | 1.75 | 1.74 |
| 5/16 | 0.458 | 0.104 | 0.453 | 1.5 | 1.49 |
| 7/16 |
| 0.781 |
| 0.144 |
| 0.776 |
| 2.25 |
| 2.24 |
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.