Available sizes: 4# to 8# (3 sizes)
| Size | P | e | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 4# | / | 0.331 | 0.328 | 0.335 | 0.390 | 32 | 0.054 | 0.375 | 0.200 | 0.327 | 0.405 |
| 6# | / | 0.409 | 0.406 | 0.405 | 0.470 | 24 | 0.054 | 0.455 |
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.
| 0.270 |
| 0.405 |
| 0.485 |
| 8# | / | 0.409 | 0.406 | 0.405 | 0.470 | 32 | 0.054 | 0.455 | 0.270 | 0.405 | 0.485 |
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.