1-1/2″ x 4″ ASTM F3125 A325 Type 1 Heavy Hex Structural Bolt – Plain

When pairing a nut with a hex bolt, the material and finish must match. If these do not match, the nut will not fit the bolt.

Conquest A325 Type 1 Structural Bolts are engineered for demanding structural steel connections in commercial construction, bridges, and heavy infrastructure. Their heavy hex head design provides maximum clamping force, ensuring stability in critical load-bearing assemblies. Trusted by contractors and steel fabricators, these bolts offer performance where it matters most.

ASTM F3125 Compliant 1-1/2″ Hex Bolts for Structural Applications

Manufactured to meet ASTM F3125 standards (incorporating A325 specifications), these structural bolts are ideal for high-load connections requiring precision, strength, and durability. The plain finish offers flexibility for controlled environments where additional coatings are not required.

Key Features

• Structural-Grade Strength: Built for bridgework, high-rise framing, and heavy steel construction.
• ASTM F3125 Compliant: Ensures reliable performance in critical applications.
• Heavy Hex Head: Delivers enhanced torque and load distribution at connection points.
• Plain Finish: Suitable for indoor or protected environments where coatings aren’t needed.
• Trusted by Pros: Preferred by contractors and engineers for consistency and performance.
• Ideal for Steel-to-Steel Connections: Designed to secure structural beams, columns, and plates.
• Made for Fast-Paced Jobsites: Reliable, easy-to-install design supports efficient workflows.

Common Applications

• Bolting structural steel beams and girders in bridge construction
• Steel frame connections in commercial and industrial buildings
• Support assemblies for highway sign structures and overpasses
• Joining columns, braces, and plates in steel-to-steel joints
• Heavy-duty fastening in fabrication shops and on-site erection projects

Installation Tips

• Always use matching heavy hex nuts and hardened washers with matching finish
• Apply installation torque using turn-of-nut or calibrated wrench methods per job specifications
• Check for full thread engagement and flush bearing surfaces before final tightening

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