Standard: GB 2028 - 1980
Available sizes: M12 to M27 (7 sizes)
| Size | P | e | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|---|
| M12 | 23 | 5 | 3 | 16 | 22 | 13 | 17 | 5 | 15 | 19.6 | 3 |
| M14 | 25 | 5 | 3 | 18 | 26 | 14 | 19 | 5 | 19 | 21.9 | 3 |
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.
| M16 |
| 30 |
| 6 |
| 3 |
| 26 |
| 34 |
| 16 |
| 27 |
| 10 |
| 19 |
| 31.2 |
| 4 |
| M18 | 35 | 6 | 3 | 30 | 42 | 18 | 32 | 15 | 22 | 36.9 | 4 |
| M22 | 40 | 6 | 3 | 34 | 45 | 22 | 36 | 20 | 24 | 41.6 | 4 |
| M24 | 45 | 7 | 4 | 42 | 53 | 24 | 44 | 25 | 26 | 50.3 | 5 |
| M27 | 48 | 7 | 4 | 44 | 60 | 26 | 46 | 30 | 27 | 53.1 | 5 |
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