 Welcome back MechanicalEI! Did you know that IS or International Standard Conventions in bearings help denote complex bearing structures using simple 2D drawings? This makes us wonder, what are conventions in bearings? Before we jump in, check out the previous part of this series to learn about what bearings are. Now, there are three main representations of roller element bearings. First is the representation of ball bearings. Balls in the rolling elements are represented by the use of circle between the races. Second are roller bearings. Here, rollers are shown as square elements between the races. Third are needle bearings which are denoted by rectangles between the races. Shown here are the two types of variations in needle bearings. One along the radial direction and another along the axial direction. Journal bearings consist of many representations due to their wide variety of types from simple dry bearings which consist of just a shaft in a hole to hydrodynamic bearings which consists of a fluid pump that circulates the lubricant between the hole and the shaft. One common representation is that consisting of an oil hole in the top and depicts the shaft as a solid cylinder and the hole with a hatched cross section. Hence, we first saw what IE's conventional representation is, first in roller bearings and then in journal bearings. So like, subscribe and comment with your feedback to help us make better videos. Thanks for watching. Also, thanks a lot for those constructive comments. You helped the channel grow. So, here are the top mechanical EIs of our last videos. In the next episode of Mechanical EI, find out what pedestal and footstep bearings are.