Types of Bolts with Pictures

Bolts are essential fasteners used in construction, machinery, automotive, and numerous other applications. Their versatility, strength, and reliability make them a staple in various industries. This article explores different types of bolts, detailing their characteristics, applications, and unique features, each accompanied by an illustrative description that helps visualize their functions.

1. Hex Bolts

Description Hex bolts, characterized by their hexagonal heads, are among the most common types of bolts. Typically made from steel, they are used with a nut to fasten two or more objects together.

Application Hex bolts are widely utilized in construction, automotive, and machinery applications. They provide high tensile strength and are available in several grades to accommodate different load requirements.

2. Carriage Bolts

Description Carriage bolts have a rounded head and a square section beneath it that prevents the bolt from turning when tightened. This design makes them ideal for wooden structures.

Application Commonly used in woodworking, carriage bolts are perfect for joining wood to wood or metal to wood, providing a secure and flush finish. They are frequently found in furniture assembly and other woodworking projects.

3. Lag Bolts

Description Lag bolts, or lag screws, have a coarse thread and a large diameter, similar to a carriage bolt but with a pointed end for easy insertion. They typically do not require a nut since they can be directly driven into the material.

Application Used primarily in heavy timber construction, such as deck building and heavy frame applications, lag bolts offer strong holding power and are ideal for long-lasting outdoor projects.

4. Eye Bolts

Description Eye bolts have a loop at the end, allowing for the attachment of rigging, cables, or rope. The design variance includes both threaded and non-threaded varieties.

Application Eye bolts are commonly employed in lifting applications, where they are secured into a structure and used to hoist or pull heavy objects. They are often found in construction, marine, and rigging industries.

5. Flange Bolts

Description Flange bolts have a circular protruding flange under the head that acts as a built-in washer, distributing the load over a wider area to prevent damage to the material being fastened.

Application Frequently used in automotive and machinery settings, flange bolts provide a reliable solution where vibration might loosen other fasteners. They are particularly effective in securing exhaust systems and attaching components in machinery.

6. Socket Head Cap Screws

Description These bolts feature a cylindrical head with an internal hexagon drive, allowing for efficient tightening with an Allen wrench. They have straight shanks that provide a clean and finished appearance.

Application Socket head cap screws are suitable for applications requiring a low-profile fastener. They are extensively used in machinery, tooling, and where aesthetics are essential.

7. Set Screws

Description Set screws are typically used to secure an object within or against another object. They can have a variety of heads, but they are most commonly found with a hex socket head.

Application Often used in machine assemblies, set screws can secure gears, pulleys, and wheels to shafts, making them crucial in mechanical applications.

8. T-Bolts

Description T-bolts feature a T-shaped head that fits into a groove, allowing for easy adjustment within channels or tracks. This design permits flexibility in securing items.

Application Commonly used in the assembly of framing systems, T-bolts provide adjustable fastening solutions in applications like furniture assembly and structural framing.

Summary

Bolts are more than just metal fasteners; they are critical components that ensure the structural integrity of a wide range of applications, from buildings to machinery. Understanding the various types of bolts—such as hex bolts, carriage bolts, lag bolts, eye bolts, flange bolts, socket head cap screws, set screws, and T-bolts—enables professionals and DIY enthusiasts alike to select the appropriate fasteners for their projects. Each type of bolt serves a specific purpose and is designed to handle various load requirements, ensuring safety and durability in any construction or manufacturing endeavor. By familiarizing yourself with these fasteners, you can enhance your skills in assembly and construction, ensuring the success of your ventures.