Standard: ANSI B 18.23
Available sizes: 1/2 to 5/8 (6 sizes)
| Size | P | e | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/2 | 1.000 | 0.31 | 0.18 | 0.45 | 0.42 | 1.75 | 1.72 | 0.16 | 0.14 | 1.78 | 0.47 |
| 1/4 | 0.312 | 0.19 | 0.14 | 0.26 | 0.23 | 0.88 | 0.85 | 0.12 |
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.
| 0.10 |
| 0.91 |
| 0.28 |
| 3/4 | 1.500 | 0.31 | 0.14 | 0.50 | 0.47 | 2.25 | 2.22 | 0.12 | 0.10 | 2.28 | 0.52 |
| 3/8 | 0.750 | 0.31 | 0.18 | 0.45 | 0.42 | 1.75 | 1.72 | 0.16 | 0.14 | 1.78 | 0.47 |
| 5/16 | 0.500 | 0.31 | 0.18 | 0.45 | 0.42 | 1.75 | 1.72 | 0.16 | 0.14 | 1.78 | 0.47 |
| 5/8 | 1.250 | 0.31 | 0.14 | 0.50 | 0.47 | 2.25 | 2.22 | 0.12 | 0.10 | 2.28 | 0.52 |
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.