Standard: GB /T 39949.1
Available sizes: 12 to 32 (5 sizes)
| Size | P | k_max | k_min | s_max | s_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|
| 12 | 12500 | 37 | 16 | 57 | 57 | 37 | 16 |
| 16 | 32000 | 57 | 25 | 84 | 84 | 57 | 25 |
| 20 | 80000 | 92 | 40 | 133 | 133 | 92 | 40 |
| 25 |
| 200000 |
| 142 |
| 63 |
| 185 |
| 185 |
| 142 |
| 63 |
| 32 | 320000 | 172 | 80 | 225 | 225 | 172 | 80 |
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.
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