Standard: ANSI B 18.1
Available sizes: 1 to 7/8 (6 sizes)
| Size | P | k_max | k_min | s_max | s_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|
| 1 | 1.665 | 1.282 | 1.219 | 1.588 | 2.938 | 2.813 | 1.439 |
| 1-1/8 | 1.790 | 1.375 | 1.312 | 1.713 | 3.171 | 3.031 | 1.549 |
| 1/2 | 0.655 | 0.500 | 0.469 | 0.600 | 1.157 | 1.063 | 0.553 |
| 3/4 | 1.160 | 0.891 | 0.844 | 1.098 | 2.063 | 1.938 | 0.996 |
| 5/8 | 0.905 | 0.687 | 0.656 | 0.850 | 1.609 | 1.500 | 0.775 |
| 7/8 | 1.415 | 1.078 | 1.031 | 1.345 | 2.500 | 2.375 | 1.217 |
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.