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 | 4 | 65 | 2.5 | 40 | 71.3 | 68 | 39 | 23.95 | 26.05 | 38 | 25 |
| M39 | 4.5 | 70 | 3 | 46 | 82.6 | 76 | 45 |
| 26.95 |
| 29.05 |
| 44 |
| 28 |
| M42 | 5 | 85 | 3.5 | 53 | 93.9 | 86 | 52 | 31.95 | 33.05 | 51 | 32 |
| M45 | 6 | 100 | 4 | 65.2 | 110.5 | 100 | 64 | 38.75 | 41.25 | 62.8 | 40 |
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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