ThePipingMart Blog Fasteners 3 Types of Cap Nut and Their Uses

3 Types of Cap Nut and Their Uses

Cap Nut

Cap nuts, also known as acorn nuts, are a type of nut with an enclosed dome on one end. This dome serves to protect the threaded portion of the nut from damage. The most common types of cap nuts are hexagonal and round, but other variants are also available. In this guide, we’ll look at the different types of cap nuts available so that you can choose the best one for your next project.

Different Types of Cap Nuts

Hexagonal Cap Nut

Hexagonal cap nuts are the most common type of cap nut and for a good reason. They offer great strength and durability since they have six-sided bodies that allow them to fit into place securely. They can be used in various applications—from furniture assembly to automotive repairs. Additionally, they come in both metric and imperial sizes, so you can easily find the right size for your project.

Round Cap Nut

Round cap nuts offer an added layer of protection compared to standard hexagonal cap nuts because they feature a larger dome-shaped head which covers more surface area than their hexagonal counterparts. This makes them ideal for applications where a greater amount of protection is needed, such as outdoor furniture or boat fittings. Like hexagonal cap nuts, round cap nuts come in both metric and imperial sizes, so you can easily find the one that’s just right for your needs.

Knurled Cap Nut

Knurled cap nuts are designed with exterior ridges that help provide extra grip when tightening or loosening them by hand. This makes them perfect for situations where extra torque is needed, but tools can only be used when working with electronics or plumbing fixtures. Knurled caps also have larger dome heads than standard hexagonal or round cap nuts, which makes them even better at providing extra protection from damage and wear and tear over time.


Cap nuts are essential in many projects due to their strength and durability. There are several different kinds available—hexagonal, round, and knurled—so it’s essential to know which type best suits your needs before you start any project involving these versatile fasteners. No matter which type you choose, you’ll be sure to get a reliable connection every time!

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