5/16"-18 Grade 8 Hex Prevailing Torque Top Lock Nuts Zinc

Product Description

Part Number: 31CPTNCZ
Diameter/Pitch: 5/16"-18
Grade: Grade 8
Finish: Zinc Clear
Thread Series: Coarse (UNC)
Wrench Size: 1/2"

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5/16"-18 Grade 8 Hex Prevailing Torque Top Lock Nuts Zinc

SKU: 31CPTNCZ

Product Description

Part Number: 31CPTNCZ
Diameter/Pitch: 5/16"-18
Grade: Grade 8
Finish: Zinc Clear
Thread Series: Coarse (UNC)
Wrench Size: 1/2"

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Thread Size	5/16"-18
Finish	Zinc Clear
Thread Series	Coarse (UNC)
Proof Load (min)	7,860 lbf
Locking Type	All-metal prevailing torque (distorted thread)
Max Temperature	Rated to 450°F (all-metal)

Grade	Grade 8
Head Type	Hex
Head Marking	J995 Grade 8 marking
Specifications Met	IFI-100/107
Prevailing Torque	24 in-lb max (first installation)

Material	Medium carbon steel, heat treated
Wrench Size	1/2"
Thread Class	2B
Lock Type	Top Lock Nuts
Break Away Torque	4.5 in-lb min (fifth removal)

Technical Drawing

Not to scale · IFI-100/107 · See table for exact dimensions

Technical Dimensions

Width Across Flats	0.500" (1/2")
Thread Size	5/16"-18
Width Across Corners	0.577" max
Thread Class	2B
Proof Load	7,860 lbf
Prevailing Torque	24 in-lb max (first installation)
Break-Away Torque	4.5 in-lb min (fifth removal)
Locking Type	All-metal prevailing torque (distorted thread)
Max Temperature	Rated to 450°F (all-metal)
Material	Medium carbon steel, heat treated

All-metal prevailing torque nut with a distorted top thread that grips the bolt, resisting vibration loosening without a nylon insert. Suitable for elevated temperatures where nylon would fail.

Dimensions conform to IFI-100/107 and may vary within specified manufacturing tolerances.