PRODUCT SPECIFICATIONSPart #: 0000-120167Fastener Type: Heavy Hex NutSize Description: 5/8"-11Diameter/Nominal Size: 5/8"Thickness: 39/64" (0.587-0.631")Wrench Size/Across Flats: 1 1/16" (1.031-1.062")Width Across Corners: 1.175-1.227"Thread Pitch: 11Thread Pitch Type: CoarseThread Direction: RightSystem of Measurement: InchGrade: A (2)Material: Low Carbon SteelFinish: Zinc PlatedDrive Type: External HexStandards Met: A563Used with: Bolts/Screws up to Grade 5Average Piece Weight: 0.1084600 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.