When it comes to securing heavy-duty structures and machinery, Heavy Hexagonal Bolts are the go-to choice for engineers and construction professionals. These bolts are specifically designed to handle higher stress levels and provide superior clamping force compared to standard hex bolts. The larger wrenching surface of the Heavy Hexagonal Bolts allows for greater torque application, making them ideal for critical applications in construction, bridges, and industrial equipment. Their robust design ensures reliable performance under extreme conditions, reducing the risk of failure and enhancing overall safety. For projects demanding exceptional strength and durability, Heavy Hexagonal Bolts offer a dependable solution that meets rigorous industry standards.


The Heavy Hexagon Bolts feature a distinct hexagonal head that is larger and thicker than standard hex bolts, providing a more substantial bearing surface. This design minimizes the risk of rounding off during installation and allows for higher preloads, which is crucial in applications subjected to vibration and dynamic loads. Manufactured from high-quality materials such as carbon steel, alloy steel, or stainless steel, these bolts undergo strict quality control to ensure consistent performance. They are available in a wide range of sizes and finishes to suit various environmental conditions and specifications. Whether used in structural steel connections, heavy machinery, or transportation infrastructure, Heavy Hexagon Bolts deliver the reliability and strength needed for long-term performance.

Key Parameters of Heavy Hexagon Bolts

  • Material: Carbon Steel, Alloy Steel, Stainless Steel
  • Grade/Class: ASTM A325, ASTM A490, SAE J429 Grade 5, Grade 8
  • Diameter Range: 1/2 inch to 4 inches
  • Length Range: 1 inch to 30 inches
  • Thread Type: UNC (Unified National Coarse) or UNF (Unified National Fine)
  • Finish: Plain, Hot-Dip Galvanized, Zinc Plated, Mechanical Galvanized
  • Head Style: Heavy Hex
  • Drive Type: Hex Socket

Standard Dimensions for Heavy Hexagon Bolts (ASTM A325 Type 1)

Bolt Diameter (inches) Head Width Across Flats (inches) Head Height (inches) Thread Length (inches)
1/2 7/8 11/32 1
5/8 1-1/16 13/32 1-1/4
3/4 1-1/4 1/2 1-1/2
7/8 1-1/2 9/16 1-3/4
1 1-3/4 5/8 2
1-1/8 2 23/32 2-1/4
1-1/4 2-1/4 13/16 2-1/2

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