A Complete Guide on Mounting Bolts

As versatile fasteners that play a vital role in maintaining stability, durability, and structural integrity, mounting bolts are essential when it comes to securely installing various fixtures, such as cabinets, small parts storage units, and brackets. In this blog, we will explore their different types, sizes, and applications so that you choose the right mounting bolts for your project.

Understanding Mounting Bolts

Mounting bolts, also known as through bolts or fastening bolts, are threaded fasteners specifically designed to provide secure and reliable attachments. In particular, these bolts consist of a shank, which is a long cylindrical body with external threading, as well as a head that aids in tightening and loosening. By passing through a hole or pre-drilled opening, mounting bolts supply robust joints as they either engage with a nut on the opposite side or thread directly into a pre-tapped hole.

Types of Mounting Bolts

To categorize mounting bolts, it is customary to classify them based on their construction and usage.

  • Hex head bolts, or hexagon bolts, feature a six-sided head that makes them easy to grip and tighten with a wrench or socket. Due to their strength and versatility, these bolts are widely used in construction, furniture assembly, and automotive applications.
  • Commonly referred to as coach bolts, carriage bolts have a rounded, dome-shaped head with a square section underneath. This square segment prevents the bolt from spinning during installation, which creates added security. For this reason, carriage bolts are commonly used in woodworking, especially for attaching metal brackets or hinges to wooden surfaces.
  • Lag bolts, or lag screws, are heavy-duty fasteners that possess coarse threading and a hexagonal head. As they grant excellent holding power, these bolts are designed for use with wood and are often utilized in construction, including in applications that involve anchoring large furniture pieces or mounting heavy-duty hardware.
  • As we make it to the end of this list, we cannot go without mentioning eye bolts, which feature a looped or circular head known as an eye. This eye allows for the attachment of cables, ropes, or hooks, making these bolts ideal for lifting or securing objects. With this in mind, they are frequently used in industries such as maritime, construction, and entertainment.

Selecting the Right Mounting Bolt

To ensure you select the mounting bolt(s) that suits your particular demands, it is pertinent to take a few key factors into account, all of which we will be exploring in greater detail below:

  • Material: Mounting bolts are available in various materials, including stainless steel, carbon steel, and brass. You will need to choose one that suits your specific application and environment. For example, stainless steel bolts are corrosion-resistant and ideal for outdoor or high-humidity settings, so if that fits your task and purpose, then stainless steel would work best.
  • Size and Length: Furthermore, the size and length of the mounting bolt should match the requirements of the project. To confirm these standards are met, examine the thickness of the material being fastened, then select a bolt with adequate length to ensure a secure attachment.
  • Load-Bearing Capacity: Additionally, determine the anticipated load or weight that the bolt will need to support. From there, you will need to verify that the selected bolt has the necessary load-bearing capacity to handle the task.

Installation Process

In order to effectively complete the installation process, there are a few steps you will need to follow:

  • Preparation: Ensure that you have the correct tools like a wrench or socket set, along with any necessary safety equipment. Double-check that the hole or pre-drilled opening is the appropriate size for the mounting bolt.
  • Insertion: After that step, insert the mounting bolt through the hole or opening. If required, add a washer or nut to aid in securing the bolt.
  • Tightening: Lastly, using a wrench or socket, tighten the bolt firmly until it is securely fastened. Be cautious not to overtighten, as this may damage the material or strip the threading.


In summary, mounting bolts are the unsung heroes of secure assembly installation, as they supply stability and strength to numerous fixtures. At ASAP NSN Parts, we recognize that by understanding the different types, sizes, and applications of mounting bolts, you can confidently select the appropriate fasteners for your projects. As an AS9120B, ISO 9001:2015 and FAA AC 00-56B accredited enterprise, we are your premier choice with unwavering commitment to quality offerings. We invite you to browse our parts catalog today or use our intuitive search engine to find an exact product, keeping in mind that you may initiate the purchasing process at any time using our Instant RFQ service. Get started today, and see how we can serve you as your strategic sourcing partner for all your operational needs.


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