Standard: DIN 7338
Available sizes: 3 to 5 (3 sizes)
| Size | P | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|
| 3 | 4 | 3.80 | 2 | 3.82 | 7.50 | 0.8 | 0.3 | 6.92 | 1 |
| 4 | 6 | 5.80 | 3 | 5.82 | 11.50 | 1 | 0.4 | 10.80 | 1.2 |
| 5 | 10 | 9.75 | 5 | 9.78 | 18.00 |
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.
| 1.2 |
| 0.6 |
| 17.30 |
| 1.4 |
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.