Standard: JB /T 7553
Available sizes: YMQJ1 to YMQJ7 (7 sizes)
| Size | P | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|
| YMQJ1 | M110×2 | 60 | 5 | Tr110×4 | 210 | 260 | 11.8 | 170 | 40 |
| YMQJ2 | M125×2 | 60 | 5 | Tr125×6 | 220 | 270 | 13 | 180 | 40 |
| YMQJ3 | M140×2 | 60 | 5 | Tr140×6 | 240 |
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.
| 310 |
| 14 |
| 200 |
| 40 |
| YMQJ4 | M160×3 | 70 | 8 | Tr160×6 | 280 | 465 | 23 | 230 | 40 |
| YMQJ5 | M180×3 | 70 | 8 | Tr180×8 | 300 | 510 | 25 | 250 | 40 |
| YMQJ6 | M200×3 | 70 | 8 | Tr200×8 | 320 | 550 | 27 | 270 | 40 |
| YMQJ7 | M210×4 | 70 | 8 | Tr210×8 | 330 | 575 | 28 | 280 | 40 |
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.