Standard: NB/T 47024 - 2012
Available sizes: 300 to 650 (8 sizes)
| Size | P | e | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 300 | PN=1 | 404 | 394/404 | 360 | 365 | PN=1 | 353/360 | PN=1 | 389/404 | 354/360 | PN=1 |
| 350 | PN=1 | 504 | 494/504 | 460 | 465 | 453 | 453/460 | 489 | 489/504 | 454/460 | PN=1 |
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.
| 400 | PN=1 | 615 | 594/604 | 565 | 565 | 553 | 554/560 | 589 | 594/604 | 554/560 | PN=1 |
| 450 | PN=1 | 715 | 694/704 | 665 | 687 | 653 | 654/660 | 689 | 694/704 | 654/660 | PN=1 |
| 500 | 803 | 865 | 865 | 815 | 837 | 804 | 804/810 | 844 | 844/854 | 815 | 839 |
| 550 | 1044 | 1087 | 1065 | 1037 | 1039 | 1004 | 1010 | 1044 | 1054 | 1015 | 1044 |
| 600 | 1200 | 1277 | 1255 | 1227 | 1248 | 1200 | 1205 | 1240 | 1255 | 1205 | 1240 |
| 650 | 1300 | 1377 | 1355 | 1327 | 1348 | 1305 | 1305 | 1355 | 1355 | 1305 | 1340 |
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.