PRODUCT SPECIFICATIONSPart #: 0000-200072Fastener Type: Hex Flange Nut Case HardenedSize Description: 1/2-13Diameter/Nominal Size: 1/2Thickness: 0.437-0.458"Wrench Size/Across Flats: 0.736-0.750"Width Across Corners: 0.840-0.866"Flange Diameter: 1.000-1.031"Thread Pitch: 13Thread 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: 0.0480500 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.