Standard: ZQ 4454 - 1997
Available sizes: 10*13.5 to 8*11.5 (7 sizes)
| Size | P | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|
| 10*13.5 | 14.5 | 1.5 | 1.7 | 14.2 | 17.9 | G1/4A | 1.17 | 17.7 | 1.3 |
| 12*16 | 17.5 | 1.5 | 1.7 | 17.2 | 20.9 | G3/8A | 1.43 | 20.7 | 1.3 |
| 14*18 | 20.5 | 1.5 | 1.7 | 20.2 | 23.9 |
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.
| — |
| 1.51 |
| 23.7 |
| 1.3 |
| 16*20 | 22.5 | 1.5 | 1.7 | 22.2 | 26.9 | — | 2.23 | 26.7 | 1.3 |
| 17*21 | 27.6 | 1.5 | 1.7 | 27.3 | 31.9 | G3/4A | 3.64 | 31.7 | 1.3 |
| 18*22 | 30.6 | 2 | 2.2 | 30.3 | 35.9 | — | 4.57 | 35.7 | 1.8 |
| 8*11.5 | 10.5 | 1 | 1.2 | 10.2 | 13.4 | G1/8A | 0.59 | 13.2 | 0.8 |
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.