Fractional Size A490 Type 1 Heavy Hex Structural Bolt with Plain Finish

Fractional Size A490 Type 1 Heavy Hex Structural Bolt with Plain Finish

The Fractional Size A490 Type 1 Heavy Hex Structural Bolt with Plain Finish is engineered for the most demanding structural steel connections where maximum strength and clamping force are required. Designed to meet ASTM A490 Type 1 specifications, this high-strength structural bolt is widely used in critical load-bearing applications such as high-rise buildings, bridges, industrial facilities, and infrastructure projects.

Manufactured from alloy steel and heat-treated to achieve superior mechanical properties, A490 heavy hex bolts provide significantly higher tensile strength than standard structural bolts. Their performance makes them ideal for connections requiring high pre-load tension and exceptional reliability under extreme stress.

Built to ASTM A490 Type 1 Specifications

ASTM A490 Type 1 heavy hex structural bolts are specifically designed for steel-to-steel structural joints that require pre-tensioned installation. The heavy hex head configuration offers a larger bearing surface than standard hex bolts, ensuring improved load distribution and stronger wrench engagement during installation.

Key Specifications and Features

• Fractional inch diameters for compatibility with structural steel assemblies

• Alloy steel construction for high tensile and shear strength

• Heat-treated for enhanced durability and performance

• Heavy hex head design for increased clamping force

• Suitable for slip-critical and bearing-type connections

These bolts are commonly installed using calibrated torque or tension control methods to meet project specifications.

Plain Finish for Structural Applications

A490 structural bolts are supplied in a plain finish because hot-dip galvanizing is generally not recommended due to hydrogen embrittlement risks. The uncoated surface ensures consistent torque-tension performance and precise dimensional tolerances.

Advantages of Plain Finish A490 Bolts

• Accurate thread engagement

• Reliable pre-load control

• Ideal for interior or controlled environments

• Compatible with project-specific protective systems

Common Applications

Fractional Size A490 Type 1 Heavy Hex Structural Bolts with Plain Finish are commonly used in:

• Structural steel erection

• Bridge construction

• Industrial plants and heavy equipment frames

• Column-to-beam connections

• High-load infrastructure assemblies

For engineers, contractors, and fabricators requiring maximum structural fastening strength, A490 heavy hex structural bolts deliver proven performance, code compliance, and long-term reliability.