Standard: ASME B 18.2
Available sizes: 1/2 to 9/16 (7 sizes)
| Size | P | e | r | k_max | k_min | s_max | s_min | ds_max | ds_min | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|
| 1/2 | 1.0000 | 0.519 | 0.887 | 1.450 | 1.500 | 8 | 12 | 1.732 | 0.831 | 1.653 |
| 1/4 | 0.3125 | 0.180 | 0.273 | 0.489 | 0.500 | 18 | 24 | 0.577 | 0.258 |
| 0.557 |
| 3/8 | 0.5625 | 0.301 | 0.496 | 0.861 | 0.875 | 12 | 18 | 1.010 | 0.473 | 0.982 |
| 5/16 | 0.4375 | 0.240 | 0.385 | 0.675 | 0.688 | 14 | 20 | 0.794 | 0.365 | 0.768 |
| 5/8 | 1.3750 | 0.747 | 1.206 | 1.994 | 2.062 | 6 | 12 | 2.382 | 1.138 | 2.273 |
| 7/16 | 0.7500 | 0.398 | 0.665 | 1.088 | 1.125 | 10 | 16 | 1.299 | 0.617 | 1.240 |
| 9/16 | 1.2500 | 0.687 | 1.094 | 1.812 | 1.875 | 7 | 12 | 2.165 | 1.030 | 2.066 |
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.