Standard: ANSI B 18.6
Available sizes: 3# to 8# (5 sizes)
| Size | P | k_max | k_min | s_max | s_min | ds_max | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|
| 3# | 40 | 0.076 | 0.07 | 0.219 | 0.205 | 0.028 | 0.086 | 0.038 |
| 4# | 32 | 0.093 | 0.091 | 0.27 | 0.256 | 0.05 | 0.103 | 0.065 |
| 5# | 24 | 0.126 | 0.112 | 0.373 |
| 0.357 |
| 0.06 |
| 0.137 |
| 0.075 |
| 6# | 20 | 0.162 | 0.133 | 0.492 | 0.473 | 0.08 | 0.175 | 0.095 |
| 8# | 16 | 0.244 | 0.191 | 0.74 | 0.716 | 0.085 | 0.261 | 0.1 |
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.