Standard: ZQ 4333 - 2006
Available sizes: M10 to M8 (8 sizes)
| Size | P | k_max | k_min | s_max | s_min | ds_max | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|
| M10 | 2.5 | 5 | 200 | 35 | 30 | 140 | 12 | 24 |
| M12 | 3.5 | 6 | 255 | 50 | 41 | 160 | 16 | 36 |
| M16 | 4.5 | 9 | 330 | 70 | 60 | 200 | 20 | 51 |
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.
| M20 |
| 5.5 |
| 15 |
| 355 |
| 90 |
| — |
| 190 |
| 25 |
| 68 |
| M24 | 6 | 17 | 425 | 110 | — | 210 | 30 | 87 |
| M30 | 6 | 18 | 440 | 120 | — | 210 | 30 | 96 |
| M6 | 1.25 | 3.5 | 110 | 18 | 12 | 85 | 8 | 10 |
| M8 | 1.75 | 4 | 125 | 25 | 18 | 90 | 10 | 15 |
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.