ThePipingMart Blog Fasteners What is Cap Nut? Types, Dimensions and Uses

What is Cap Nut? Types, Dimensions and Uses

What is a Cap Nut

A cap nut is a type of fastener that is used to secure two or more objects together. It has a unique shape and design compared to other nuts, featuring an integrated dome-shaped head that acts as a decorative covering for the threaded end of the nut. Cap nuts can be used for various applications, from furniture assembly to creating custom jewelry pieces. This blog post will discuss the different types and uses of cap nuts.

Types of Cap Nuts

Cap nuts come in several varieties, including hexagonal, round, square, and slotted. Hexagonal cap nuts have six sides and are typically used with automotive parts or machinery components requiring extra torque. Round cap nuts feature a cylinder shape and require no additional tooling to install; they work best with thin sheet metal or wood panels and can be tightened by hand or with pliers. Square cap nuts provide more surface area contact and are often used in furniture construction or in electronics where space is limited; they require specialized tools for installation. Slotted cap nuts feature slots along the length of their shank, which allow them to be adjusted after installation without having to be removed; this type is most commonly used for decorative purposes such as jewelry making or crafts projects.

Cap Nut Uses

Cap nuts are one of the most versatile fasteners available and can be used in many applications. They are popularly employed in automotive repair – from securing body panels to attaching brake lines – as well as furniture construction due to their low-profile design. Additionally, cap nuts can be used for decorative purposes such as creating custom jewellery pieces or embellishing crafts projects with colourful accents; some types also feature integrated washers, making them ideal for outdoor applications where weather resistance is needed. Lastly, they can also be found on various machines around the home, such as washing machines, dryers, dishwashers, water heaters, stoves, refrigerators, freezers, etc., providing an easy way to secure vital components in place without any additional tooling required!

Cap Nut Properties

  • A cap nut, also known as a domed cap nut or acorn nut, is a type of fastener with a domed top used to cover the end of a bolt or stud.
  • Cap nuts are made from brass, stainless steel, or aluminium.
  • They are available in a variety of sizes and thread pitches.
  • Cap nuts are easy to install and remove and provide a clean, finished look.
  • Cap nuts can be used in various applications, including furniture, automotive, and plumbing.

Cap Nut Dimensions

Cap Nut Dimensions

Max Min Max Min Max Min
6 0.138 0.3125 0.302 0.361 0.344 0.3 0.34 0.16 0.25 0.16
8 0.164 0.3125 0.302 0.361 0.344 0.3 0.34 0.16 0.25 0.16
10 0.19 0.375 0.362 0.433 0.413 0.36 0.41 0.19 0.28 0.19
43469 0.25 0.4375 0.428 0.505 0.488 0.41 0.47 0.22 0.34 0.25
43601 0.3125 0.5 0.489 0.577 0.557 0.47 0.53 0.25 0.41 0.31
43532 0.375 0.5625 0.551 0.65 0.628 0.53 0.62 0.28 0.45 0.38
43467 0.5 0.75 0.736 0.866 0.84 0.72 0.81 0.38 0.59 0.5
43593 0.625 0.9375 0.922 1.083 1.051 0.91 1 0.47 0.75 0.62
43528 0.75 1.0625 1.045 1.227 1.191 1.03 1.16 0.53 0.88 0.75


In summary, cap nuts are a type of fastener that comes in several varieties. They can be employed for many uses, from automotive repair to decorative accents on handmade items. They offer a low profile design which makes them ideal for tight spaces, and their flat, domed top provides extra protection against dust and moisture accumulation over time. Whether you’re looking to repair an old car part or create something new out of wood or metal – cap nuts should be your go-to choice!

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