Knurling is a manufacturing process that involves creating a pattern of small ridges or “knurls” on the surface of a metal workpiece. The process is typically performed using a specialized tool called a knurling tool, which is composed of two hardened steel rolls with the knurling pattern cut into their surfaces. The workpiece is held in a lathe and rotated, while the knurling tool is pressed against its surface, forming the pattern of ridges.
Knurling serves a number of purposes, including improving grip, facilitating the alignment of mating parts, and providing a decorative effect. It is commonly used in a wide range of industries, including machinery manufacturing, automotive and aerospace, and medical equipment.