Standard: QC /T 404 - 2013
Available sizes: 5 to 8 (3 sizes)
| Size | P | e | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 5 | 16 | 5.5 | 12.0 | 4.8 | 10.0 | M12x1.5 | NPT1/8 | 24.0 | 10 | 4.0 | 10 |
| 6 | 16 | 6.0 | 14.5 | 9.0 | 13.7 | M16x1.5 | NPT1/4 | 30.5 |
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.
| 15 |
| 8.0 |
| 13 |
| 8 | 12 | 6.0 | 14.5 | 11.0 | 15.7 | M18x1.5 | NPT3/8 | 31.5 | 15 | 10.0 | 15 |
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.