Standard: ASME B 18.16
Available sizes: 1/2 to 9/16 (6 sizes)
| Size | P | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|
| 1/2 | 1.000 | 1.000 | 1.632 | 1.602 | 8 | 12 | 1.312 | 1.250 | 20 | 1.796 |
| 1/4 | 0.3125 | 0.335 | 0.566 | 0.551 | 18 | 24 | 0.453 | 0.423 | 32 | 0.624 |
| 3/8 | 0.5625 | 0.655 |
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.
| 0.942 |
| 0.922 |
| 12 |
| 18 |
| 0.812 |
| 0.782 |
| 24 |
| 1.037 |
| 5/16 | 0.4375 | 0,464 | 0.754 | 0.736 | 14 | 20 | 0.609 | 0.579 | 28 | 0,829 |
| 7/16 | 0.750 | 0.790 | 1.255 | 1.231 | 10 | 16 | 1.015 | 0.985 | 20 | 1.382 |
| 9/16 | 1.125 | 1.096 | 1.820 | 1.788 | 7 | 12 | 1.469 | 1.407 | 18 | 2.002 |
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.