This standard presents criteria and guidelines for the basis of flexible coupling ratings. It is not a comprehensive rating method that can be applied to a specific product or manufacturer. Due to the diversity of coupling types@ this standard presents generally accepted practices rather than rigorous engineering analyses. This standard is of importance to coupling manufacturers@ users and equipment designers for the proper selection and application of flexible couplings. Applicability This document is applicable to standard couplings as defined by ANSI/AGMA 9009.