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Product Description

Part Number: 31CNHF8P/FS
Diameter/Pitch: 5/16"-18
Grade: Grade 8
Finish: Phosphate & Oil
Coarse / Fine Threads: Coarse
Wrench Size: 1/2"
Click Here for Tech Drawing




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5/16"-18 Grade 8 Hex Flange Nuts Phos & Oil

SKU: 31CNHF8P/FS
Product Description

Part Number: 31CNHF8P/FS
Diameter/Pitch: 5/16"-18
Grade: Grade 8
Finish: Phosphate & Oil
Coarse / Fine Threads: Coarse
Wrench Size: 1/2"
Click Here for Tech Drawing




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Diameter Pitch5/16"-18
FinishPhosphate & Oil
Thread Class2B
Width Across Flats0.500" (1/2")
Major Diameter0.312"
Tensile Stress Area0.0524 sq in
Head TypeHex Flange
GradeGrade 8
MaterialMedium carbon alloy steel, quenched and tempered
Threads Per Inch18 TPI
Width Across Corners0.577" max
Proof Load7,860 lbf
HardnessRockwell C33–C39
Nominal Size5/16"
Grade MaterialGrade 8
Coarse Fine ThreadsCoarse
Wrench Size1/2"
Head Height17/64"
Proof Stress150,000 psi
Head MarkingJ995 Grade 8 marking
Inch MetricInch

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