What does hex nut size mean?

Hex nut size refers to the dimensions of a hexagonal nut, which is a type of fastener with six flat sides and an internally threaded hole. The size of a hex nut is typically determined by the distance across opposite flat sides, which is also known as the “across flats” measurement. For example, a 1/2-inch hex nut has a distance of 1/2 inch between opposite flat sides.

Hex nuts are commonly used with bolts and screws to securely fasten two or more objects together. It is important to use the correct size of nut for the corresponding bolt or screw, as using a nut that is too small or too large can result in the joint being inadequately secured or damaged. The size of the hex nut can also affect the amount of torque that can be applied during installation, with larger nuts generally being able to handle greater torque loads.