PRODUCT SPECIFICATIONSPart #: 0000-109195Fastener Type: Finished Hex NutSize Description: 5/16"-24Diameter/Nominal Size: 5/16"Thickness: 17/64" (0.258-0.273")Wrench Size/Across Flats: 1/2" (0.489-0.500")Width Across Corners: 0.557-0.577"Thread Pitch: 24Thread 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: 0.0110700 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.