Standard: ASME B 18.2
Available sizes: 1/2 to 9/16 (7 sizes)
| Size | P | r | k_max | k_min | s_max | s_min | ds_max | ds_min | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|
| 1/2 | 1.000 | 1.018 | 1.450 | 1.500 | 8 | 12 | 1.732 | 0.982 | 1.653 |
| 1/4 | 0.3125 | 0.336 | 0.489 | 0.500 | 18 | 24 | 0.577 | 0.320 | 0.557 |
| 3/8 | 0.5625 | 0.621 |
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.
| 0.861 |
| 0.875 |
| 12 |
| 18 |
| 1.010 |
| 0.598 |
| 0.892 |
| 5/16 | 0.4375 | 0.463 | 0.675 | 0.688 | 14 | 20 | 0.794 | 0.444 | 0.768 |
| 5/8 | 1.500 | 1.526 | 2.175 | 2.250 | 6 | 12 | 2.598 | 1.474 | 2.480 |
| 7/16 | 0.750 | 0.827 | 1.088 | 1.125 | 10 | 16 | 1.299 | 0.798 | 1.240 |
| 9/16 | 1.250 | 1.272 | 1.812 | 1.875 | 7 | 12 | 2.165 | 1.228 | 2.066 |
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.