Standard: EN 22340
Available sizes: 10 to 8 (7 sizes)
| Standard Body | Standard Number |
|---|---|
| EN | EN 22340 |
| GB | GB /T 880 |
| NF | NF E 25-753 |
| DIN | DIN EN 22340 |
| ISO | ISO 2340 |
| Size | P | s_max | s_min |
|---|---|---|---|
| 10 | 21.87 | 22 | 4 |
| 12 | 23.87 | 24 | 4 |
| 3 | 3.925 | 4 | 1 |
| 4 | 5.925 | 6 | 2 |
| 5 | 9.91 | 10 | 2 |
| 6 | 13.89 | 14 | 3 |
| 8 | 17.89 | 18 | 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.