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PRODUCT SPECIFICATIONS Part #: 0000-110455 Fastener Type: Stover All Metal Locknut Size Description: 3/8"-16 Diameter/Nominal Size: 3/8" Thickness: 0.320-0.337" Wrench Size/Across Flats: 0.551-0.5645" Thread Pitch: 16 Thread Pitch Type: Coarse Thread Direction: Right System of Measurement: Inch Grade: C (8) Material: Medium Carbon Steel Finish: Zinc Plated / Wax Drive Type: External Hex Used with: Bolts/Screws up to Grade 8, Alloy Socket Screws, 12-Point Flange Screws Average Piece Weight: 0.0146500 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.