Part Number: 31CPTNCZ
Diameter/Pitch: 5/16"-18
Grade: Grade 8
Finish: Zinc Clear
Coarse / Fine Threads: Coarse
Wrench Size: 1/2"
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5/16"-18 Grade 8 Hex Prevailing Torque Top Lock Nuts Zinc
Part Number: 31CPTNCZ
Diameter/Pitch: 5/16"-18
Grade: Grade 8
Finish: Zinc Clear
Coarse / Fine Threads: Coarse
Wrench Size: 1/2"
Click Here for Tech Drawing

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| Diameter Pitch | 5/16"-18 |
| Finish | Zinc Clear |
| Threads Per Inch | 18 TPI |
| Proof Load | 7,860 lbf |
| Lock Type | Top Lock Nuts |
| Prevailing Torque | 24 in-lb max (first installation) |
| Grade | Grade 8 |
| Material | Medium carbon steel, heat treated |
| Width Across Flats | 0.500" (1/2") |
| Proof Stress | 150,000 psi |
| Locking Type | All-metal prevailing torque (distorted thread) |
| Break Away Torque | 4.5 in-lb min (fifth removal) |
| Grade Material | Grade 8 |
| Thread Class | 2B |
| Width Across Corners | 0.577" max |
| Tensile Stress Area | 0.0524 sq in |
| Inch Metric | Inch |
| Max Temperature | Rated to 450°F (all-metal) |
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