Standard: GB /T 3759 - 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 | 16 | 7 | 19.8 | 22.29 | 22.16 | L | M30*2 | 20 | 20.5 | 22 | 9.5 |
| 4 | 10 | 3.5 | 11.3 | 5.215 | 5.14 | LL | M10*1 | 11.5 | 12 | 5 | 5.5 |
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.
| 5 |
| 10 |
| 3.5 |
| 11.8 |
| 8.24 |
| 8.15 |
| LL |
| M12*1 |
| 12 |
| 12.5 |
| 8 |
| 6 |
| 6 | 25 | 5 | 16.8 | 15.26 | 15.15 | L | M22*1.5 | 17 | 17.5 | 15 | 8.5 |
| 8 | 16 | 5 | 17.8 | 18.26 | 18.15 | L | M26*1.5 | 18 | 18.5 | 18 | 8.5 |
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.