BIS Certification is Mandatory for Tapered Roller Bearings as per IS 12102:1987. The Indian Standard has been developed to define what is required concerning the dimension of the boundary and designation of the series of tapered roller bearings to be used as either radial or combined radial and axial bearings. The main parameters used in defining the essential parameters include principal dimensions, tolerance classes, designation system, and dimensional accuracy to ascertain that there is interchangeability, compatibility, and reliability of performance of various industrial applications. The standard focuses on consistency in design and dimensional fit in order that tapered roller bearings can fit easily in machine and automotive components without differences in operations. It also sets the requirements of marking, identification and verification of dimensions to ensure consistency and traceability. BIS certification of IS 12102:1987 guarantees manufacturers and end users standardized dimensions, reliable functioning, and appropriateness of tapered roller bearings to apply the bearings in automotive systems, in industrial machinery, and in heavy-duty equipment that functions under heavy load conditions.