Knurling on metal is primarily used for?

Knurling on metal is primarily used for enhancing grip. This manufacturing process involves creating a pattern of ridges or indentations on the surface of a metal object, which increases friction when held. This is particularly useful in applications where a secure hold is necessary, such as on tools, handles, and fasteners. The textured surface allows for better contact with the user's hand, reducing the likelihood of slipping and improving control and safety in handling the item.

While some other processes may aim to reduce weight, increase strength, or polish surfaces, knurling specifically focuses on modifying the surface texture to provide a functional grip, making it distinct from those other purposes.