PRODUCT SPECIFICATIONSPart #: 0000-114621Fastener Type: Finished Hex Nut - USASize Description: 1/2"-20Diameter/Nominal Size: 1/2"Thickness: 7/16" (0.427-0.448")Wrench Size/Across Flats: 3/4" (0.736-0.750")Width Across Corners: 0.840-0.866"Thread Pitch: 20Thread Pitch Type: FineThread Direction: RightSystem of Measurement: InchGrade: 5Material: Medium Carbon SteelFinish: Zinc PlatedDrive Type: External HexUsed with: Bolts/Screws up to Grade 5Average Piece Weight: 0.0360000 lbs.Country of Manufacture: United StatesNuts 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.