Standard: GB /T 802.4 - 2009
Available sizes: M10 to M8 (5 sizes)
| Size | P | e | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|---|
| M10 | 2.5 | 1.2 | 18.58 | 22 | 21.48 | 1.5 | 2 | 26.16 | 19.42 | 29.56 | 27 |
| M4 | 0.8 | 0.5 | 4.96 | 7 | 6.64 | / | / | 7.78 | 5.44 | 8.79 | 8 |
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.
| M5 |
| 1.25 |
| 0.8 |
| 9.21 |
| 12 |
| 11.57 |
| 1 |
| / |
| 12.73 |
| 9.79 |
| 14.38 |
| 13 |
| M6 | 1.75 | 1 | 13.15 | 16 | 15.57 | 1.5 | 1.25 | 17.73 | 13.85 | 20.03 | 18 |
| M8 | 2 | 1 | 16.65 | 20 | 19.48 | 1.5 | / | 23.67 | 17.35 | 26.75 | 24 |
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.