Standard: BS 450 - 1958
Available sizes: 1/4 to 7/32 (4 sizes)
| Size | P | e | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/4 | 0.500 | 4 | 0.050 | 0.710 | 0.311 | 12 | 16 | 0.362 | 0.031 | 0.750 | 0.412 |
| 1/8 | 0.1875 | 2 | 0.025 | 0.292 | 0.124 | 24 | (32) |
| 0.156 |
| 0.015 |
| 0.313 |
| 0.180 |
| 3/16 | 0.2500 | 3 | 0.040 | 0.389 | 0.163 | 20 | 26 | 0.207 | 0.031 | 0.414 | 0.237 |
| 7/32 | 0.3750 | 4 | 0.045 | 0.590 | 0.260 | 16 | 20 | 0.315 | 0.031 | 0.622 | 0.355 |
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.