5/16-24 Grade 2 Finished Hex Nut Zinc Plated . 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: 5/16 inch

• Basic Major Diameter: 0.3125 inches

• Width Across Flats:

• Maximum: 0.500 inches

• Minimum: 0.489 inches

• Thickness:

• Maximum: 0.577 inches

• Minimum: 0.557 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 ratings range from B68 to C32

• Proof Load:

• Coarse thread: 90,000 psi

• Fine thread: 80,000 psi

Plating:

• The zinc plating provides a protective layer that enhances resistance against moisture and corrosive conditions, making these nuts suitable for outdoor and industrial applications.

This combination of properties makes the 5/16-24 Grade 2 finished hex nut zinc plated an excellent choice for reliable fastening needs.