Standard: BS 4320
Available sizes: (M14) to M8 (7 sizes)
| Size | P | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|
| (M14) | 24 | 44 | 42.8 | 24.6 | 24 | 3.6 | 2.4 | 44 | 3 |
| (M18) | 36 | 66 | 64.5 | 36.8 | 36 | 6.0 | 4 | 66 | 5 |
| M10 |
| 16 |
| 30 |
| 29.2 |
| 16.5 |
| 16 |
| 2.8 |
| 2.2 |
| 30 |
| 2.5 |
| M12 | 20 | 37 | 35.8 | 20.6 | 20 | 3.6 | 2.4 | 37 | 3 |
| M16 | 30 | 56 | 54.5 | 30.6 | 30 | 4.6 | 3.4 | 56 | 4 |
| M20 | 42 | 77 | 75.5 | 42.8 | 42 | 7 | 5 | 77 | 6 |
| M8 | 11 | 24 | 23.2 | 11.5 | 11 | 2.3 | 1.7 | 24 | 2 |
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.