Standard: ISO 9255 - 2008
Available sizes: MJ4 to MJ7 (4 sizes)
| Size | P | e | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MJ4 | 050 | 4.978 | 4.99 | 4.955 | 4.99 | 0.8 | 5 | 5 | 4.88 | 4.97 | 4.965 |
| MJ5 | 070 | 6.972 | 6.987 | 6.952 | 6.987 | 1 | 7 |
| 7 |
| 6.85 |
| 6.967 |
| 6.962 |
| MJ6 | 100 | 9.972 | 9.987 | 9.952 | 9.987 | 1.25 | 10 | 10 | 9.85 | 9.967 | 9.962 |
| MJ7 | 120 | 11.966 | 11.984 | 11.949 | 11.984 | 1.25 | 12 | 12 | 11.82 | 11.964 | 11.959 |
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.