What does the third digit in the frame size indicate on a motor nameplate?

The third digit in the frame size on a motor nameplate reflects the distance between the mounting foot holes in inches. This specific measurement is crucial for ensuring that the motor can be properly mounted to a base or frame, aligning with pre-existing installation designs. Knowing the foot hole distance helps in selecting the appropriate motor for an application, ensuring compatibility with mounting configurations and maintaining structural integrity during operation. This aspect of the motor’s specifications is vital for installation and maintenance processes in various industrial settings.