Standard: GB 858 - 1988
Available sizes: 10 to 24 (8 sizes)
| Size | P | k_max | k_min | s_max | s_min | ds_max | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|
| 10 | 12.5 | 3 | 3.8 | 28 | 19 | 2.3 | 1 | 9 |
| 12 | 16.5 | 3 | 4.8 | 34 | 22 | 2.99 | 1 | 13 |
| 14 | 20.5 | 4 | 4.8 | 38 | 27 | 3.5 | 1 | 17 |
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.
| 16 |
| 24.5 |
| 4 |
| 4.8 |
| 45 |
| 34 |
| 5.01 |
| 1 |
| 21 |
| 18 | 27.5 | 5 | 4.8 | 48 | 37 | 5.4 | 1 | 24 |
| 20 | 33.5 | 5 | 5.7 | 56 | 43 | 10.01 | 1.5 | 30 |
| 22 | 36.5 | 5 | 5.7 | 60 | 46 | 10.76 | 1.5 | 33 |
| 24 | 40.5 | 5 | 5.7 | 62 | 49 | 10.33 | 1.5 | 37 |
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.