Standard: QC /T 385 - 1999
Available sizes: M16 to M24 (3 sizes)
| Size | P | e | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|---|
| M16 | 1.5 | 14 | 12 | 13.6 | 18 | 20.5 | 14.5 | 2.5 | 12.12 | 12 | 12 |
| M20 | 2 | 23 | 20 | 21.6 | 24 | 27 | 19 |
| 5 |
| 20.14 |
| 20 |
| 16 |
| M24 | 2 | 34 | 30 | 32.4 | 32 | 36 | 24 | 8 | 30.14 | 30 | 20 |
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.