Standard: GB /T 5650 - 2008
Available sizes: 10 to 8 (5 sizes)
| Size | P | e | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 10 | 18 | 26.5 | 21.5 | 24.7 | 22.2 | 18.25 | 18.15 | 13.5 | 18.5 | M27*1.5 | 5.5 |
| 4 | 5 | 18.5 | 14.5 | 8.4 | 7 | 5.25 | 5.15 | 8.5 |
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.
| 12.5 |
| M10*1 |
| 4.5 |
| 5 | 8 | 24 | 19 | 11.7 | 10.5 | 8.25 | 8.15 | 13 | 18 | M14*1.5 | 5.5 |
| 6 | 12 | 25.5 | 20.5 | 15.7 | 14.5 | 12.25 | 12.15 | 13.5 | 18.5 | M18*1.5 | 5.5 |
| 8 | 16 | 26.5 | 21.5 | 21.7 | 19.2 | 16.25 | 16.15 | 13.5 | 18.5 | M24*1.5 | 5.5 |
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.