Standard: ISO 8740 - 1998
Available sizes: Φ1.5 to Φ6 (7 sizes)
| Standard Body | Standard Number |
|---|---|
| EN | EN 28740 |
| GB | GB /T 13829.2 |
| DIN | DIN EN ISO 8740 |
| ISO | ISO 8740 |
| Size | P | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|
| Φ1.5 | 2 | 0.18 | 0.8 |
| 1.975 |
| 2.2 |
| 2.84 |
| 8~30 |
| 2.15 |
| 0.25 |
| Φ2 | 3 | 0.3 | 1.2 | 2.975 | 3.25 | 6.4 | 10~40 | 3.15 | 0.4 |
| Φ2.5 | 5 | 0.5 | 1.7 | 4.925 | 5.3 | 17.6 | 14~60 | 5.2 | 0.63 |
| Φ3 | 8 | 0.8 | 2.6 | 7.91 | 8.35 | 45.2 | 14~100 | 8.25 | 1 |
| Φ4 | 12 | 1.2 | 3.8 | 11.89 | 12.45 | 101.8 | 18~100 | 12.25 | 1.6 |
| Φ5 | 20 | 2 | 6 | 19.87 | 20.6 | 283 | 26~100 | 20.4 | 2.5 |
| Φ6 | 25 | 2.5 | 7.5 | 24.87 | 25.6 | 444 | 26~100 | 25.4 | 3 |
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.