Standard: BS 4278 - 1984
Available sizes: M12 to M36 (6 sizes)
| Size | P | k_max | k_min | s_max | s_min | k_nominal |
|---|---|---|---|---|---|---|
| M12 | 0.8 | 23 | 3 | 29 | 20 | 12 |
| M16 | 2.5 | 40 | 6 | 52 | 35 | 21 |
| M20 | 6.3 | 63 | 9 | 81 | 54 | 32 |
| M24 | 10 | 79 | 11 | 101 | 68 | 40 |
| M30 |
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.
| 16 |
| 100 |
| 14 |
| 128 |
| 86 |
| 51 |
| M36 | 25 | 126 | 18 | 162 | 108 | 65 |
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.