Standard: ASME B 18.8
Available sizes: 0# to 7# (5 sizes)
| Size | P | k_max | k_min | s_max | s_min | ds_max | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|
| 0# | 0.086 | 0.146 | 0.070 | 0.086 | 0.084 | 0.005 | 0.162 | 0.059 |
| 2# | 0.120 | 0.240 | 0.103 | 0.120 | 0.118 | 0.005 | 0.260 | 0.091 |
| 4# | 0.144 | 0.287 | 0.119 | 0.144 | 0.142 | 0.005 | 0.309 | 0.107 |
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.
| 6# | 0.196 | 0.382 | 0.152 | 0.196 | 0.194 | 0.016 | 0.408 | 0.140 |
| 7# | 0.250 | 0.443 | 0.174 | 0.250 | 0.248 | 0.016 | 0.472 | 0.161 |
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.