Square Head Bolts

What is a Square Head Bolt?

A square head bolt is a heavy-duty industrial fastener featuring a distinct four-sided, square-shaped head. This unique head design offers a remarkably large bearing area for positive gripping with an open or adjustable wrench. The wide flat sides provide maximum wrench contact, which translates to a tighter hold and significantly less slippage during installation or removal compared to standard hex bolts.

Technical Specifications

Our square head bolts are precision-manufactured for optimal fit and reliable performance in demanding structural environments. Key measurement standards and specifications include:

• Thread Fit: All square head bolts feature a standard Class 2A thread fit for reliable assembly.
• Head Width Measurement: The head width (or corresponding wrench size) is measured precisely across the flat sides of the square head.
• Length Measurement: The overall length of the fastener is measured directly from under the head to the tip of the threaded shank.

Common Industry Applications

While hex bolts have become the standard in modern construction, square head bolts remain a highly sought-after fastener for specific industrial, structural, and aesthetic applications, including:

• Historic building restoration and rustic architectural projects
• Heavy machinery and classic automotive assemblies
• Heavy timber construction and railway infrastructure
• General structural applications requiring high-torque wrenching in tight or blind spaces

Available Materials and Manufacturing

U-Bolt-It supplies premium square head bolts built to withstand the demands of rigorous industrial use. We manufacture and distribute these reliable fasteners in a wide variety of high-strength materials, including carbon steel, stainless steel, and specialty alloys to meet the exact environmental demands of your project.

Request a Quote Today

Have a question about our manufactured square head bolts? Contact our team directly by phone or by using our secure online form to submit your project details. You can also give us a call today to speak directly with our fastener specialists. We look forward to speaking with you!