Standard: ISO 7720 - 1997
Available sizes: (M14) to M8 (6 sizes)
| Standard Body | Standard Number |
|---|---|
| GB | GB /T 6186 |
| ISO | ISO 7720 |
| Size | P | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|
| (M14) | 4 | 53.8 | 60.79 | 38.5 | 38.9 | 36 | 26.5 |
| 55 |
| 51.11 |
| 33.1 |
| M10 | 2.5 | 29.16 | 32.95 | 21.8 | 21.6 | 20 | 15.2 | 30 | 27.7 | 19 |
| M12 | 3.5 | 45 | 50.85 | 31.8 | 32.4 | 30 | 21.8 | 46 | 42.75 | 27.3 |
| M5 | 1 | 9.78 | 11.05 | 6.7 | 6.75 | 6 | 4.32 | 10 | 8.88 | 5.4 |
| M6 | 1.5 | 15.73 | 17.77 | 10.5 | 10.8 | 10 | 7.15 | 16 | 14.63 | 8.94 |
| M8 | 2 | 20.67 | 23.36 | 15.4 | 15.1 | 14 | 10.7 | 21 | 19.64 | 13.4 |
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.