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PRODUCT SPECIFICATIONSPart #: 0000-114458Fastener Type: Stover All Metal LocknutSize Description: 1/2"-13Diameter/Nominal Size: 1/2"Thickness: 0.427-0.448"Wrench Size/Across Flats: 0.736-0.7520"Thread Pitch: 13Thread Pitch Type: CoarseThread Direction: RightSystem of Measurement: InchGrade: C (8)Material: Medium Carbon SteelFinish: Zinc Plated / WaxDrive Type: External HexUsed with: Bolts/Screws up to Grade 8, Alloy Socket Screws, 12-Point Flange ScrewsAverage Piece Weight: 0.0346500 lbs.Lock nuts resist loosening of the screw under vibration or force to prevent loosening from a bolted joint. Types of lock nuts are prevailing torque nuts (Stover), elastic stop nuts (Nyloc), serrated flange (whiz lock), 2-way (reversible), star lock (KEPS) and many others.