Standard: IS 5370 - 1969
Available sizes: (2.5) to 6.4 (8 sizes)
| Size | P | s_max | s_min |
|---|---|---|---|
| (2.5) | 8 | 0.8 | M2.5 |
| (3.7) | 22 | 2 | M7 |
| (7.4) | 60 | 4 | M20 |
| 2.8 | 11 | 0.8 | M3.5 |
| 3.2 | 15 | 1.5 | M5 |
| 4.3 | 30 | 2.5 | M10 |
| 5.3 | 45 | 3 |
| M14 |
| 6.4 | 56 | 4 | M18 |
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.