Rim lock series are most popular for their compatibility, aesthetic looks, ease of mounting, better strength, crowbar proof, etc. But they are mostly over designed without analysing the design parameters, which increases the usage of material and manufacturing that leads to increase in the cost. The main objective of the work is to design the lock using complaint mechanism which allows to flex the components itself to act like spring action which will not only improve the design but also reduce the number of components to be used.FEA analysis and DFM has been used to improve the quality of design by which the usage of material reduced which leads to decrease in the manufacturing cost. 
Key words: Rim lock, complaint mechanism, FEA, DFM. 
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