Stator Measurements Guide

It is often necessary to take stator measurements and compare to specifications to make sure that the correct part is being purchased, especially on “split year” models. There are typically three measurements that are used to identify the stator: the “outside diameter”, “inside diameter”, and “stack thickness”. These measurements should ideally be taken using a vernier caliper.

Outer Diameter (OD): This is the diameter of the stator, taken across the outer surface of opposing poles. It should be taken using the external jaws of the caliper:

Inner Diameter (ID): This is the diameter of the inside of the metal stack, taken across the surface of the inner circle of the stator. It should be taken using the internal jaws of the caliper:

Stack Thickness (THK): This is the thickness of the metal stator core. It is measured on the circular inside core itself from the top surface to the bottom surface, not the outer poles. It should be measured using the depth bar of the caliper (make sure the right angle of the bar and caliper body is flush against the surface):

Note: We measure stators in metric units, so these measurements are typically given in metric units (millimeters). If the available measurement is in standard, remember that 1”=25.4mm