Standard: ASME B 18.6
Available sizes: 2# to 8# (6 sizes)
| Size | P | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|
| 2# | 0.0990 | 0.041 | 0.059 | 0.133 | 7/32 | 0.187 | 0.030 | 0.053 | 0.167 | 0.072 |
| 3# | 0.1250 | 0.064 | 0.075 | 0.169 | 1/4 | 0.237 | 0.035 | 0.077 | 0.215 |
| 0.094 |
| 4# | 0.1640 | 0.099 | 0.100 | 0.224 | 7/16 | 0.312 | 0.043 | 0.113 | 0.285 | 0.124 |
| 5# | 0.2160 | 0.145 | 0.132 | 0.297 | 9/16 | 0.412 | 0.054 | 0.162 | 0.380 | 0.172 |
| 6# | 0.3125 | 0.232 | 0.191 | 0.432 | 5/8 | 0.597 | 0.074 | 0.251 | 0.556 | 0.252 |
| 8# | 0.3750 | 0.281 | 0.230 | 0.509 | 5/8 | 0.717 | 0.086 | 0.303 | 0.670 | 0.302 |
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.