When a NEMA motor has special mounting dimensions, flanges, or special shaft features, this is indicated by adding a suffix letter to its frame number.

For example: a 254TS frame motor indicates that the motor has a different shaft extension length and diameter than a 254T frame motor.

The standard suffix letters and their meanings are as follows:

• C = C flange mount

• D = D flange mount

• P/PH = Vertical P or PH flange mount

• T = Standard shaft for belt service

• TS = Standard short shaft for coupling applications

• Y = Special mounting dimensions

• Z = Special shaft extension