Standard: GB /T 819.1 - 2016
Available sizes: (M3.5) to M3 (5 sizes)
| Standard Body | Standard Number |
|---|---|
| GB | GB /T 819.1 |
| NF | NF E 25-119-1 |
| DIN | DIN EN ISO 7046-1 |
| ISO | ISO 7046-1 |
| UNI | UNI 7688 |
| Size | P | e | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|
| (M3.5) | 1.5 | 9.8 | 10 | 17.78 | 5 | 3 | 20 | 3.8 | 4 | 18.30 | 2.5 |
| M1.6 | 0.4 | 1.9 | 1.9 | 3.5 | 1.2 | 0.8 | 4.4 | 1 | 0 | 3.8 | 0.5 |
| M2 | 0.5 | 3 | 3.2 | 5.2 | 1.65 | 1 | 6.3 | 1.25 | 1 | 5.5 | 0.8 |
| M2.5 | 0.7 | 4.4 | 4.6 | 8.04 | 2.7 | 1.4 | 9.4 | 1.75 | 2 | 8.40 | 1 |
| M3 | 1 | 6.6 | 6.8 | 10.87 | 3.3 | 2 | 12.6 | 2.5 | 3 | 11.30 | 1.5 |
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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