Standard: GB 12616 - 1990
Available sizes: (Φ3.2) to Φ4 (3 sizes)
| Standard Body | Standard Number |
|---|---|
| GB | GB /T 12616.1 |
| ISO | ISO 15974 |
| Size | P | k_max | k_min | s_max | s_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|
| (Φ3.2) | 5.09 | 1.6 | 2.8 | 4.91 | 9.89 | 9.31 | 27 |
| Φ3 | 3.29 | 1.2 |
| 1.8 |
| 3.11 |
| 6.24 |
| 5.76 |
| 26 |
| Φ4 | 6.09 | 2 | 3.6 | 5.91 | 12.35 | 11.65 | 31 |
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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