5/8-11 Grade 2 Finished Hex Nut Plain . Grade 2 Finished Hex Nuts are manufactured from low carbon steel, 1008-1010 for diameters up to 1 inch (cold-formed) and 1045 steel for diameters over 1 inch (hot-formed). Material is manufactured to meet or exceed ASTM A563 Grade A. Zinc plated material will meet or exceed ASTM F1941. Hot-Dip Galvanized material will meet or exceed ASTM A563. Hot-Dip Galvanized nuts are over tapped per ASTM A563. Hardness requirements of HRB 68 - HRC 32 are met or exceeded. Proof load strength of 90,000 psi minimum is met for plain or zinc plated material, 68,000 psi for Hot-Dip Galvanized material. Specifications: Nominal Size: 1 1/2 inch Basic Major Diameter: 1.5000 inches Width Across Flats: Maximum: 2.250 inches Minimum: 2.175 inches Thickness: Maximum: 2.598 inches Minimum: 2.480 inches Material Composition: Steel Type: Low carbon steel Chemical Composition: Carbon: Maximum 0.47% Phosphorus: Maximum 0.12% Sulfur: Maximum 0.23% Mechanical Properties: Tensile Strength: Minimum of 74,000 psi Hardness: Rockwell hardness typically ranges from B68 to C32 Proof Load: Coarse thread: 90,000 psi Fine thread: 80,000 psi This combination of features makes the 1 1/2-12 Grade 2 finished hex nut (plain) an excellent choice for various fastening needs.
