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48 Frame Spa Motors
We sell a wide variety of AO Smith Century 48 frame electric motors for hot tubs. These are the smaller of the two through-bolt style spa motors with 3 5/8 inch between studs. These are NEW, not reconditioned. These became an industry standard in 2006-07 (because most other brands DO NOT SELL SERVICE PARTS!)
How to Determine Your Spa Motor Size The easiest way to determine whether your spa takes a 48-frame or 56-frame motor is to measure between the thru-bolts. These are the bolts that run the length of the motor and screw into the four legs of the wet-end volute or seal plate.
If you measure 3 5/8" between bolts, you need a 48 frame motor BELOW (If you measure 4 1/8" between bolts, you need a 56 frame motor)