Product Manual

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NEMA Frame Suffixes

C = NEMA C face mounting (specify with or without rigid base)

D = NEMA D flange mounting (specify with or without

rigid base)

H = Indicates a frame with a rigid base having an F dimension

larger than that of the same frame without the suffix H. For

example, combination 56H base motors have mounting

holes for NEMA 56 and NEMA 143-5T and a standard

NEMA 56 shaft

J = NEMA C face, threaded shaft pump motor

JM = Close-coupled pump motor with specific dimensions and

bearings

JP = Close-coupled pump motor with specific dimensions and

bearings

M = 6

” flange (oil burner)

N = 7

” flange (oil burner)

T,TS = Integral horsepower NEMA standard shaft dimensions if

no additional letters follow the “T” or “TS”.

TS = Motor with NEMA standard “short shaft” for belt-

driven loads.

Y = Non-NEMA standard mount; a drawing is required to be

sure of dimensions. Can indicate a special base, face or

flange.

Z = Non-NEMA standard shaft; a drawing is required to be sure

of dimensions.

Frame Prefixes

Letters or numbers appearing in front of the NEMA frame number are

those of the manufacturer. They have no NEMA frame significance. The

significance from one manufacturer to another will vary. For example,

the letter in front of LEESON’s frame number, L56, indicates the overall

length of the motor.

Mounting

Unless specified otherwise, motors can be mounted in any position

or any angle. However, unless a drip cover is used for shaft-up or

shaft-down applications, drip proof motors must be mounted in the

horizontal or sidewall position to meet the enclosure definition. Mount

motor securely to the mounting base of equipment or to a rigid, flat

surface, preferably metallic.