Bearings are an important element to many machines, as they reduce friction between two objects, allowing moving parts to move more smoothly. Life Cycle Assessment is a useful engine of sustainability manufacturing and gives details of environment impact, created by human activity or product. Today’s society is very concern about environment and they put pressure on manufacturing plants, to produce less environment damaging product. This paper aims to measure the effect on the environment created due to cage production of Needle Roller Bearing. This will be achieved through Life Cycle Assessment. It is performed from gate to gate i.e. only for production phase on GaBi software (version 8.7).