Needle Bearing Accessories Needle Rollers Description: Needle Rollers are mainly used as bearing rolling elements to reduce friction and torque in rotating and pivoting applications. However, these precision rollers have many other uses such as shafts or locating pins. Applications: Vehicle and industrial transmissions, universal joints, and two-cycle engines. Types: Flat ends, rounded ends. Sizes: Diameters from 1.5 mm (0.0591 in. ) to 14 mm (0.551 in. );