DIMENSIONAL DETAILS 
DESIGN UNITS                              (Your choices are...)
English



Metric 


It refers to the base units for specifications such as diameter, length, and threading. Combinations are possible and this information is not known for some products.

Base units such as inches or fractions of an inch for such primary dimensions as the shaft size, mounting geometry, etc.

Base units such as millimeters or centimeters for such primary dimensions as the shaft size, mounting geometry, etc.

MOTOR SHAPE                          (Your choices are...)
Cylindrical Body 

Square Body  
Motor body cross section is round.

Motor body cross section is square or rectangular.
   
Diameter / Width Diameter of cylindrical motors or width / height of square motors. This is for the motor body only and does not include flanges.
Housing Length Length of motor body, not including shaft.
NEMA Frame Size Conforms to a standard size and mounting configuration identified by the National Electrical Manufacturers Association (NEMA). Only numerical sizes are searchable in this field.
   
Enclosure Options  (Your choices are...)
Open Frame / Frameless  Motor with minimal or frame-like support but no overall casing.
Drip-proof  Drip-proof motors contain ventilation openings that are designed such that drops of liquid or solid particles falling on them from any angle within 15° (degrees) of vertical, cannot enter the motor.
Dust-proof  Dust-proof motors protect against dust infiltration with features such as total enclosure and labyrinth seals for shafts.
Totally Enclosed A totally enclosed motor has an enclosure that prevents free exchange of air between the inside and the outside of the enclosure. Common ratings are TEFC (fan-cooled) and TENV (non-ventilated). It is not an airtight rating. These motors are most frequently used in potentially contaminated environments.
Special / Extreme Environments  (Your choices are...)
Clean Room Use 







Cryogenic Use


Explosion-proof 




Radiation-hardened



Vacuum Use 



Clean rooms are classified by particulate size and density in the ambient air. One such rating method classifies rooms according to number of particles larger than 0.5 micron in one cubic foot of air; there are various governmental, metric, and international standards. 
Motors rated for suitability in a clean room will identify the particular standard for which they are rated.

Motors with a cryogenic rating are constructed for extremely low ambient temperatures such as 20 K and below.

Explosion- proof motors have totally enclosed housings that are constructed to withstand internal explosion of a specified gas, vapor or dust. Should such an explosion occur, the enclosure would prevent the ignition or explosion of the gas or vapor surrounding the motor enclosure. Several explosion-proof ratings are governed by Underwriter's Laboratories (UL).

Radiation -hardened motors are constructed of materials designed to withstand high-energy gamma radiation. Ratings are expressed in units such as permissible RADs in total accumulated dose (TAD).

Vacuum-rated motors incorporate features such as lubricant vapor pressure below rated ambient vacuum and construction techniques such as degassing during manufacture to prevent emissions during motor use.