What is grub screw?

A grub screw, also known as a set screw, is a type of fastening screw that is threaded all the way down its shank and features no head. Instead, it is tightened or loosened by using a hex or Allen key inserted into a small shallow hole in the top of the screw.

Grub screws are commonly used for holding parts on shafts or axles, or for locking two or more objects together. They are frequently used in the assembly of machinery, vehicles, and electronics. Grub screws are available in various materials including stainless steel, brass, and nylon, and come in a range of sizes and lengths.

Care should be taken when using grub screws to ensure that they are tightened securely and do not strip the threads of the part they are fastening. Over-tightening of grub screws can also lead to damage or distortion of the component.