Standard: GB /T 19674.3 - 2005
Available sizes: M10 to M8 (7 sizes)
| Size | P | e | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|---|
| M10 | / | 2 | 12 | 5 | 5.18 | / | 7 | 18 | 11.7 | 7.22 | 19 |
| M12 | / | 2.5 | 12 | 8 | 8.22 | / | 11 |
| 22 |
| 15.7 |
| 11.27 |
| 23 |
| M14 | / | 3 | 14 | 12 | 12.27 | / | 14 | 26 | 19.7 | 14.27 | 27 |
| M16 | / | 3 | 16 | 16 | 16.27 | / | / | 30.5 | 24 | / | 32 |
| M18 | / | 3 | 20 | 25 | 25.33 | / | 30 | 47 | 39 | 30.33 | 49 |
| M20 | / | 3 | 22 | 32 | 32.33 | / | 36 | 53 | 45 | 36.39 | 55 |
| M8 | 4.5 | 1.5 | 8 | / | / | 4.68 | 4 | 13 | 8.4 | 4.18 | 14 |
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.