Standard: SZJGJ 001
Available sizes: ST3 to ST4.8 (6 sizes)
| Size | P | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|
| ST3 | 1.3 | 1.3 | 1.9 | 0.1 | 7.9 | 7.5 | 3.9 | 1.83 | 2.1 | 1 |
| ST3.5 | 1.34 | 1.6 | 2.1 | 0.2 | 9 | 8.7 | 4.2 | 2.13 | 2.3 |
| 2 |
| ST3.9 | 1.6 | 2.29 | 2.8 | 0.2 | 11.2 | 10.8 | 4.9 | 2.83 | 3 | 2 |
| ST4.0 | 1.8 | 2.29 | 2.95 | 0.25 | 11.8 | 11.2 | 4.9 | 2.83 | 3.25 | 3 |
| ST4.2 | 1.8 | 2.31 | 3.3 | 0.25 | 13.5 | 13.1 | 6.2 | 2.86 | 3.6 | 3 |
| ST4.8 | 2.1 | 3.78 | 4.6 | 0.4 | 17.8 | 17 | 7.7 | 4.36 | 5 | 3 |
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.