2 3/4-4 Grade 2 Finished Hex Nut Hot Dipped Galvanized . 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.

General Characteristics:

• Type: Six-sided threaded fastener.

• Size: 2 3/4 inch nominal diameter.

Dimensions:

• Thickness: Approximately (0.875D), which translates to about 2.406 inches for a 2 3/4" nut.

• Width Across Flats: Approximately (1.5D), which is about 4.125 inches.

For 2 3/4 inch hex nut:

• Basic Major Diameter: 2.7500 inches

• Width Across Flats: Max 4.125 inches, Min 3.988 inches

• Width Across Corners: Max 4.763 inches, Min 4.546 inches

• Thickness: Max 2.431 inches, Min 2.319 inches

Material Composition:

• Made from low carbon steel conforming to the following 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 ranges from B68 to C32.

• Proof Load:

• Coarse thread: 68,000 psi

• Fine thread: 60,000 psi 

Plating:

• Hot-dip galvanized coating provides excellent corrosion resistance, making these nuts suitable for outdoor applications and environments exposed to moisture and corrosive conditions