AS9120B, ISO 9001:2015, and FAA AC 0056B ACCREDITED

Exploring the World of Bolts: Common Types and Their Applications

Bolts are simple yet essential fasteners that play a vital role in various industries and everyday applications. From securing structures to holding machinery parts together, bolts are a cornerstone of modern construction and manufacturing. In this article, we will discuss the often under-recognized world of bolts, exploring their common types, unique characteristics, and the roles they play in various industries.

Understanding the Basics of Bolts

At its core, a bolt is a threaded fastener that consists of three main components: a bolt head, bolt shaft, and threads. The bolt head is typically flat, facilitating easy tightening and installation with a wrench or socket, while the threaded shaft allows for a secure connection when screwed into a corresponding nut or threaded hole. Bolts come in a wide range of sizes and materials, making them versatile and adaptable to various applications.

Anchor Bolts - Anchor bolts are a critical type of fastener used in construction to secure heavy machinery, equipment, and structures to a concrete base or foundation. They are typically embedded into the concrete during the pouring process, providing a solid and stable anchoring point. Anchor bolts come in various designs, such as L-shaped, J-shaped, and U-shaped variations, each tailored to specific applications.

  • J-Bolts: These bolts feature a J-shaped end that is embedded into the concrete, providing excellent resistance to shear forces. They are commonly used in applications where the load is perpendicular to the bolt's axis, such as securing columns to concrete foundations.
  • L-Bolts: L-bolts are similar to J-bolts, but feature a 90-degree bend at the end, forming an L-shape. This design is particularly useful for anchoring wall plates and structural members to concrete surfaces.
  • U-Bolts: U-bolts are named as a result of their U-shaped design and are widely used to secure pipes, conduits, and other round objects to flat surfaces. They are also quite versatile and come in various sizes to accommodate different applications.

Arbor Bolts - Arbor bolts, also known as arbor screws or arbor shafts, are specially designed to secure cutting tools, such as saw blades or grinding wheels, to arbors or spindles. These bolts have unique features that make them suitable for this specific application.

  • Threaded Arbor Bolts: These bolts have threads along their shafts that allow for the easy attachment of cutting tools. Threaded arbor bolts are commonly used in woodworking and metalworking machines to ensure a secure and precise fit of the cutting tool.
  • Tapered Arbor Bolts: Tapered arbor bolts have a tapered shaft that matches the taper of the arbor, providing a snug and secure fit. This design helps minimize vibrations and ensures precise cutting in high-speed applications.

Hex Bolts - Hex bolts, also known as hexagon bolts or machine bolts, are perhaps the most recognizable type of bolt on the market. They have a six-sided hexagonal head and a threaded shaft while coming in various lengths, materials, and thread sizes, making them suitable for a wide range of applications. Below are short descriptions for the most common hex bolt subtypes.

  • Fully Threaded Hex Bolts: These bolts have threads along their entire shaft length, providing a strong grip when secured with a nut. They are commonly used in construction, automotive, and general-purpose applications.
  • Partially Threaded Hex Bolts: Partially threaded hex bolts have a portion of their shaft without threads, which allows for a combination of threaded and unthreaded sections. This design is often used in applications where the unthreaded section provides additional support or clearance.

Carriage Bolts - Carriage bolts, also known as coach bolts or round head square neck bolts, are recognized by their distinctive round heads and square necks situated just below. This square neck fits into a square hole in the material being fastened, preventing the bolt from turning when tightened. Carriage bolts are commonly used in woodworking and furniture assembly, and they come in subtypes like:

  • Mushroom Head Carriage Bolts: These carriage bolts have a rounded, mushroom-shaped head, providing a smoother and more aesthetically pleasing look. They are often used in applications where appearance matters.
  • Flat Head Carriage Bolts: Flat head carriage bolts have a flat top surface on their heads, making them ideal for flush applications. They are frequently used in situations where the head should not protrude from the surface.

Eye Bolts - Eye bolts, as the name suggests, have a loop or eye-shaped head. This design allows for the attachment of hooks, cables, or other fasteners for lifting or hanging applications. Eye bolts come in various styles, including plain eye bolts, shoulder eye bolts, and machinery eye bolts.

  • Plain Eye Bolts: Plain eye bolts have a simple, straight eye and are commonly used for general lifting and hanging applications.
  • Shoulder Eye Bolts: Shoulder eye bolts feature a larger, cylindrical shoulder beneath the eye. This shoulder provides additional strength and support in heavy-duty lifting applications.
  • Machinery Eye Bolts: Machinery eye bolts have a threaded shaft with an eye at one end and a machine screw thread at the other end. They are often used to secure cables and wires in machinery and equipment.


Overall, bolts are versatile fasteners that come in a wide array of types, each tailored to specific applications. Understanding these common types of bolts and their unique characteristics is essential for choosing the right fastener for your project or application, and procuring such components from a reputable supplier you can trust is of the utmost importance. Luckily for you, Aircraft Parts Supplier is your one-stop shop for all fastener types you require, presenting highly competitive pricing and rapid lead times on top-requested items.

Take the time to peruse our options as you see fit, and if you come across any items of interest, be sure to submit a quote request through our website at your earliest convenience. Within 15 minutes of us receiving and reviewing a completed form, you can expect to receive a tailored solution for your comparisons from one of our staff. Get started today and see why so many customers choose Aircraft Parts Supplier for their needs.


Semiconductor's Certifications and Memberships
The only independent
distributor with a
  • All Orders are fulfilled in the U.S.A.
  • All shipments must comply with U.S.A export laws.
  • No exceptions.

“We Proudly Support Intrepid Fallen Heroes Fund that serves United States Military Personal experiencing the Invisible Wounds of War : Traumatic Brain Injury (TBI) and Post Traumatic Stress (PTS). Please visit website ( and help in their valiant effort”.

Thank You for Visiting.

We Hope that You Will Visit Us Again the Next Time You Need NSN Parts and Make Us Your Strategic Purchasing Partner.

Request for Quote

We use cookies to ensure that we give you the best experience on our website. If you continue to use this site we will assume that you are happy with it.