Standard: HB 4276 - 1989
Available sizes: ST10 to ST8 (4 sizes)
| Size | P | s_max | s_min | k_nominal |
|---|---|---|---|---|
| ST10 | 1.5 | 18.25 | 28 | 185 |
| ST6 | 1 | 5.8 | 16 | 130 |
| ST7 | 1.25 | 6.55 | 20 | 145 |
| ST8 | 1.5 | 12.25 | 25 | 175 |
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.