Standard: GB /T 880
Available sizes: Φ10 to Φ8 (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 | k_max | k_min | s_max | s_min | k_nominal |
|---|---|---|---|---|---|---|
| Φ10 | 22 | 4 | 8 | 21.87 | 5 | 5.18 |
| Φ12 | 24 | 4 | 9 | 23.87 | 6.3 | 6.52 |
| Φ3 | 4 | 1 | 2.2 | 3.925 | 1 | 1.14 |
| Φ4 | 6 | 2 | 3.2 | 5.925 | 1.6 |
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.
| 1.74 |
| Φ5 | 10 | 2 | 4.5 | 9.91 | 3.2 | 3.38 |
| Φ6 | 14 | 3 | 6 | 13.89 | 4 | 4.18 |
| Φ8 | 18 | 3 | 7 | 17.89 | 5 | 5.18 |
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.