Standard: JB /T 7919.3 - 1999
Available sizes: MS44 to MS80 (7 sizes)
| Size | P | k_max | k_min | s_max | s_min | k_nominal |
|---|---|---|---|---|---|---|
| MS44 | 4 | 25.5 | / | 24 | 12 | 12 |
| MS52 | 5 | 31 | M10×20 | 24 | 15 | 12 |
| MS60 | 5 | 40 | M12×25 | 32 | 15 | 14 |
| MS64 | 5 | 43 | M16×30 | 36 | 15 | 18 |
| MS68 |
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.
| 5 |
| 45 |
| M16×30 |
| 40 |
| 15 |
| 18 |
| MS76 | 7 | 54 | M20×40 | 45 | 21 | 22 |
| MS80 | 7 | 61 | M20×40 | 50 | 21 | 22 |
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