Plain Steel Knurled Thumb Screws, M3-0.5, 12 millimeters Head Diameter, 12 millimeters Length (Pack of 5)

Thumb screws are designed to be tightened and loosened by hand. They come in a variety of head styles, but each includes an easy-grip head which allows for simple “by-hand” installation. Thumb screw has a solid one-piece construction for strength.

Plain steel provides strength, where corrosion resistance is not required. The thumb screw has a straight knurled surface on its head. This gives it a good gripping surface, making it easy to tighten or loosen the fastener manually.

A threaded fastener’s size name includes information about the major external diameter, followed by the threads per mm, which indicates if it is coarse or fine.