Rigid base
is bolted, welded, or cast on main frame and allows motor to be rigidly mounted on equipment.
Resilient base
has isolation or resilient rings between motor mounting hubs and base to absorb vibrations and noise. A conductor is imbedded in the ring to complete the circuit for grounding purposes.
NEMA C
face mount is a machined face with a pilot on the shaft end which allows direct mounting with the pump or other direct coupled equipment.
Bolts pass through mounted part to threaded hole in the motor face.
Bolts pass through mounted part to threaded hole in the motor face.
NEMA D
flange mount is a machined flange with rabbet for mountings. Bolts pass through motor flange to a threaded hole in the mounted part. NEMA C face motors are by far the most popular and most readily available. NEMA D flange kits are stocked by some manufacturers, including LEESON.
Type M or N mount
has special flange for direct attachment to fuel atomizing pump on an oil burner. In recent years, this type of mounting has become widely used on auger drives in poultry feeders.
Extended through-bolt
motors have bolts protruding from the front or rear of the motor by which it is mounted. This is usually used on small direct drive fans or blowers.
