When electric motors began to be standardized by NEMA, one of the first standards released was motor frame sizes.

There are three generations of motors:

  • Original (pre-1952)
  • U Frames (1952-1964)
  • T Frames (1964-Present)
electric motor frame sizes

Standardized Variations Key

I you have any questions, or need help finding a suitable replacement for your existing electric motor, please give us a call at 208-459-6351, and we will help you find the correct replacement.
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Electric motor frame size

Open Drip Proof

motor frame sizes

Totally Enclosed Fan Cooled