191-5665: 78mm Outer Diameter Needle Bearing

A Needle Bearing is a type of rolling contact bearing characterized by cylindrical rollers of very small diameter and relatively long length. These are also called 'quill' bearings. The needle bearings are used with or without inner or outer races. The needles are held in place by a cage or retainer, which also keeps them evenly spaced around the periphery of the shaft. Attributes: • Low coefficient of friction and less frictional loss in high-speed applications • High load capacity due to design, which features a large number of long, thin rollers that distribute the load evenly over a large surface area • Compact and lightweight, thus suitable for applications where space is limited Applications: A Needle Bearing is used to support and facilitate the rotation of the shaft inside the head of the Travel Motor.