Needle roller bearings have high length-to diameter ratios. They are quite commonly used in farm and construction equipment gasoline engines, gear pumps and small appliances. They may be lubricated with grease but oil based lubricants are considered for longitivity and smoothness.
Needle bearings have smaller rollers and have the highest load capacity for a given radial space of all rolling bearings. Needle roller bearings are available in different designs and a wide range of sizes, which are appropriate for different applications