PRODUCT SPECIFICATIONSPart #: 0000-113590Fastener Type: Heavy Hex NutSize Description: 3/8"-16Diameter/Nominal Size: 3/8"Thickness: 23/64" (0.341-0.377")Wrench Size/Across Flats: 11/16" (0.669-0.688")Width Across Corners: 0.763-0.794"Thread Pitch: 16Thread 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: 0.0286000 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.