Standard: QC /T 616 - 2011
Available sizes: 01 to 04 (4 sizes)
| Size | P | e | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 01 | NST4.5 | 8~8.2 | 15 | 9 | 7.5~7.7 | 2.8~3.3 | 2.5 | 8.5 | 6.5 | 7 | 6.8~7 |
| 02 | NST5 | 7.8~8 | 17 | 12 | 9.8~10 | 3.1~3.7 | 2.7 |
| 9.7 |
| 8.5 |
| 9 |
| 8.8~9 |
| 03 | NST5.5 | 9.8~10 | 20 | 14 | 11~11.2 | 3.6~4.2 | 3 | 11 | 9.5 | 10 | 9.8~10 |
| 04 | NST6 | 9.8~10 | 21 | 15 | 12~12.2 | 4~4.7 | 3.5 | 12 | 10.5 | 11 | 10.8~11 |
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.