Standard: GB /T 886
Available sizes: 20 to 40 (5 sizes)
| Size | P | k_max | k_min | s_max | s_min | k_nominal |
|---|---|---|---|---|---|---|
| 20 | 25.13 | 4.7 | 27 | 25 | 35 | 5 |
| 25 | 35.17 | 4.7 | 37 | 35 | 47 | 5 |
| 30 | 45.17 | 4.7 | 47 | 45 | 58 | 5 |
| 35 | 55.19 | 5.7 | 58 | 55 | 70 |
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.
| 6 |
| 40 | 65.19 | 5.7 | 68 | 65 | 80 | 6 |
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.