Deep groove bearing is widely used in rotating machines as it can operate at a wide range of load and speed combinations. This article presents two simulation models for deep groove ball bearings. The first model of bearing is a 5-DOF system block diagram model developed using MATLAB Simulink environment and the second model of bearing is a detailed three-dimensional multi-body dynamic model of bearing where contact between races, slip and effects due to friction are taken into consideration and it is developed using multi-body simulation (MBS) software ADAMS. Different geometrical faults are given to the different parts of the bearing. Envelope analysis is done to the simulated signal and the result are than interpreted to find out the condition of bearing. These models of deep groove ball bearing elements can be integrated to different machine components to find the condition of industrial rotating machines.