Standard: GB /T 14210 - 1993
Available sizes: 3.5 to 3.9 (2 sizes)
| Size | P | e | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 3.5 | 1.6 | 2.59 | 2.74 | 0.8 | 0.5 | 3.2 | 8.58 | 3.95 | 3.75 | 8.00 | 5 |
| 3.9 | 1.7 | 2.78 | 2.93 | 0.8 | 0.5 | 3.4 | 8.58 | 4.30 | 4.10 | 8.00 | 5 |
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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