Knurling forms a pattern on a workpiece. Knurling can be decorative or functional. Knurling increases the effective diameter of the workpiece.

Knurling can be straight, diamond, or angular (left-hand or right-hand). Knurls can be cut or formed. They are often used to increase a part diameter to make press fitting easier.

When specifying a knurl, be sure to specify the type, pitch, and the diameter before and after knurling. If only part of a workpiece is to be knurled, the length of the knurl should be specified.

See: ASME B94.6

See also: ASME Y14.5-12018 S 4.5.18 and Knurls & Knurling