Standard: ASME B 18.6
Available sizes: 10# to 8# (5 sizes)
| Size | P | e | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 10# | 0.3750 | 0.193 | 4 | 0.556 | 0.155 | 5/16 | 0.364 | 0.211 | 0.086 | 0.597 | 0.358 |
| 4# | 0.1250 | 0.079 | 1 | 0.191 | 0.060 | 4 | 0.119 |
| 0.081 |
| 0.030 |
| 0.212 |
| 0.122 |
| 5# | 0.1380 | 0.071 | 2 | 0.215 | 0.068 | 5 | 0.131 | 0.077 | 0.041 | 0.237 | 0.148 |
| 6# | 0.2160 | 0.117 | 2 | 0.285 | 0.069 | 8 | 0.207 | 0.122 | 0.041 | 0.312 | 0.192 |
| 8# | 0.3125 | 0.136 | 3 | 0.380 | 0.075 | 12 | 0.302 | 0.149 | 0.056 | 0.412 | 0.262 |
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.