PRODUCT SPECIFICATIONSPart #: 0000-200081Fastener Type: Hex Flange Nut Case HardenedSize Description: 7/16-20Diameter/Nominal Size: 7/16Thickness: 0.375-0.395"Wrench Size/Across Flats: 0.675-0.688"Width Across Corners: 0.768-0.794"Flange Diameter: 0.910-0.937"Thread Pitch: 20Thread Pitch Type: FineThread Direction: RightSystem of Measurement: InchGrade: 2Material: Low Carbon SteelFinish: Zinc PlatedDrive Type: External HexUsed with: Bolts/Screws up to Grade 5Average Piece Weight: 0.0340000 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.