Standard: GB 8 - 1976
Available sizes: (M14) to M20 (7 sizes)
| Size | P | k_max | k_min | s_max | s_min | ds_max | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|
| (M14) | 2.5 | 13.70 | 12.30 | 30 | 29.48 | 1 | 13 | 42.4 |
| (M18) | 3.5 | 20.30 | 17.70 | 46 | 45 | 1.5 | 19 | 65 |
| (M22) | 5 | 31.30 | 28.70 | 75 | 73.8 |
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.
| 2 |
| 30 |
| 106 |
| M10 | 1.75 | 8.58 | 7.42 | 19 | 18.48 | 0.8 | 8 | 26.9 |
| M12 | 2.0 | 10.58 | 9.42 | 24 | 23.48 | 1 | 10 | 33.9 |
| M16 | 3 | 15.70 | 14.30 | 36 | 35 | 1.5 | 15 | 51 |
| M20 | 4.5 | 27.30 | 24.70 | 65 | 63.8 | 2 | 26 | 92 |
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.