Standard: NB /T 31082 - 2016
Available sizes: M36 to M45 (4 sizes)
| Size | P | e | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|---|
| M36 | 40.4 | 2.5 | 1.25 | 6 | 5.4 | 41.02 | 72 | 3 | 3.5 | 70.8 | 6.6 |
| M39 | 46.4 | 3 | 1.5 | 8 | 6.8 | 47.02 | 85 |
| 3.4 |
| 4 |
| 83.6 |
| 9.2 |
| M42 | 54 | 4 | 2 | 10 | 8.8 | 54.74 | 100 | 4 | 4.5 | 98.6 | 11.2 |
| M45 | 66 | 4 | 2 | 10 | 8.8 | 66.74 | 115 | 4.5 | 5 | 113.6 | 11.2 |
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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