Part Number: 31C87HCS8Y
Diameter/Pitch: 5/16"-18
Length Under Head: 7/8"
Grade: Grade 8
Finish: Zinc Yellow
Coarse / Fine Threads: Coarse
Partial / Full Threads: Full
Wrench Size: 1/2"
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5/16-18x7/8" Hex Head Cap Screws Grade 8 Zinc Yellow
Part Number: 31C87HCS8Y
Diameter/Pitch: 5/16"-18
Length Under Head: 7/8"
Grade: Grade 8
Finish: Zinc Yellow
Coarse / Fine Threads: Coarse
Partial / Full Threads: Full
Wrench Size: 1/2"
Click Here for Tech Drawing

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| Diameter Pitch | 5/16"-18 |
| Grade Material | Grade 8 |
| Thread Class | 2A |
| Width Across Corners | 0.577" max |
| Proof Load | 6,290 lbf |
| Tensile Strength | 150,000 psi |
| Tensile Stress Area | 0.0524 sq in |
| Torque Dry | 25 ft-lb |
| Thread Length | Fully threaded |
| Length Under Head | 47/54" |
| Finish | Zinc Yellow |
| Threads Per Inch | 18 TPI |
| Head Height | 0.195" – 0.211" |
| Clamp Load | 4,720 lbf |
| Yield Strength | 130,000 psi |
| Hardness | Rockwell C33–C39 |
| Torque Lubricated | 18 ft-lb |
| Inch Metric | Inch |
| Grade | Grade 8 |
| Partial Full Threads | Full |
| Width Across Flats | 0.500" (1/2") |
| Major Diameter | 0.312" |
| Min Tensile Load | 7,860 lbf |
| Proof Stress | 120,000 psi |
| Head Marking | Six radial lines on head |
| Head Type | Hex Cap |
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