PRODUCT SPECIFICATIONSPart #: 0000-110613Fastener Type: Finished Hex NutSize Description: 3/8"-16Diameter/Nominal Size: 3/8"Thickness: 21/64" (0.320-0.337")Wrench Size/Across Flats: 9/16" (0.551-0.562")Width Across Corners: 0.628-0.650"Thread Pitch: 16Thread Pitch Type: CoarseThread Direction: RightSystem of Measurement: InchGrade: 2Material: Low Carbon SteelFinish: Zinc PlatedDrive Type: External HexUsed with: Bolts/Screws up to Grade 5Average Piece Weight: 0.0150700 lbs.Nuts are almost always used in conjunction with a mating bolt to fasten multiple parts together; kept together by a combination of their threads' friction, a slight stretching of the bolt, and compression of the parts to be held together.