What is the difference between a hex coupling nut and a cap nut?

One of the more impressive things about a coupling nut is the sight hole. This is an ingenious design that allows you to see if the threads are engaging properly. When you use a nut with this feature, you'll have a much easier time securing a tight fit. You can even tighten the nut by hand.

The most notable difference between a hex coupling nut and a cap nut is the diameter. Hex coupling nuts are available in many sizes, including those with a diameter of less than an inch all the way up to ones that are fourteen inches long. They can also be found in a variety of materials, including zinc, aluminum, and even stainless steel. While they're made from various metals, most coupling nuts are made from steel. These nuts are usually hex-shaped to provide a wrench's grip on the inside.

Other features to look for include a hex-shaped thread, an oversized thread, and a sight hole. In most cases, the nut's diameter is the same as the size of the bolt. However, if you want to maximize your nut's capabilities, consider using a larger diameter nut. A longer nut can help increase the joint's stability and withstand a lot of wear and tear. This is a particularly important feature to look for when considering a nut for a heavier application.

Coupling nuts are used to join two threaded rods, pipes, and other threaded parts together. In addition to being used for these applications, they can be used to join different pieces of threaded material, including those with a threaded hole. Coupling nuts are often used to make long tie rod assemblies from shorter lengths of rod.