Standard: QC /T 400 - 2013
Available sizes: 10 to 8 (6 sizes)
| Size | P | e | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 10 | 16 | 26.8 | 27.0 | 22.0 | 22.160 | M30x2 | NPT 3/4 | 24.3 | 24.4 | 19.0 | 22.290 |
| 12 | 10 | 41.8 | 42.0 | 35.3 | 35.200 | M45x2 | NPT 1-1/4 | 38.0 |
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.
| 38.1 |
| 30.0 |
| 35.400 |
| 4 | 10 | 8.2 | 8.4 | 5.0 | 5.140 | M10x1 | NPT 1/8 | 6.5 | 6.6 | 3.5 | 5.215 |
| 5 | 25 | 11.5 | 11.7 | 8.0 | 8.150 | M14x1.5 | NPT 1/4 | 10.1 | 10.2 | 6.0 | 8.240 |
| 6 | 25 | 15.5 | 15.7 | 12.0 | 12.150 | M18x1.5 | NPT 3/8 | 14.3 | 14.4 | 10.0 | 12.260 |
| 8 | 25 | 21.5 | 21.7 | 16.0 | 16.150 | M24x1.5 | NPT 1/2 | 18.3 | 18.4 | 14.0 | 16.260 |
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.