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A Guide to NEMA* Motor Frames and Shaft Dimensions

Motor ratings and dimensions shown in Table No. 1,

below, are for general purpose motors as indicated.

Frames for the 1952 - 1953 and the 1964 rerates

are shown. All dimensions are subject to change

without notice. Those shown are intended as a guide

only. Certiﬁed dimension drawings from the motor

manufacturer should be used.

Fractional Horsepower Motors

1952-53 Rerate -- Designs A, B and C -- Open Type -- Squirrel Cage -- Integral hp Motors

1964 Rerate -- Designs A, B and C -- Open Type -- Squirrel Cage -- Integral hp Motors

Table No. 1 Specications

* These motors are for direct coupled service only. s Slots.

Frame

No.

Dimensions Keyseat

Key

Length

hp for Various

Motor rpm

Max.

D E F H BA N-W U Width Depth 3600 1800 1200 900

48 5 3/8” 3 1/2” 3” 2 1/8” 1 3/8”

11/32”s

2 1/2” 1 1/2” 1/2” Flat 3/64” - 1/8-1/2 1/8-1/3 1/6 -

56 6.5 4.5 3.5 2 7/16 1 1/2

11/32 s

2.75 2 3/4 17/8 3/16” 3/32 1 3/8” 3/4-1 1/3-1 1/8-1/2 -

182 9 6 1/2 4 1/2 3 3/4 2 1/4 13/32 2 3/4 2 1/4 7/8 3 1/6 3/32 1 3/8 1 1/2 1 3/4 1/2

184 9 7 1/2 4 1/2 3 3/4 2 3/4 13/32 2 3/4 2 1/4 7/8 3 1/6 3/32 1 3/8 3,2 2, 1 1/2 1 1/2, 1 3/4

213 10 1/2 7 1/2 5 1/4 4 1/4 2 3/4 13/32 3 1/2 3 1 1/8 1/4 1/8 2 5 3 2 1 1/2, 1

215 10 1/2 9 5 1/4 4 1/4 3 1/2 13/32 3 1/2 3 1 1/8 1/4 1/8 2 7 1/2 5 3 2

254U 12 1/2 10 3/4 6 1/4 5 4 1/8 17/32 4 1/4 3 3/4 1 3/8 5/16 5/32 2 3/4 10 7 1/2 5 3

256U 12 1/2 12 1/2 6 1/4 5 5 17/32 4 1/4 3 3/4 1 3/8 5/16 5/32 2 3/4 15 10 7 1/2 5

284U 14 12 1/2 7 5 1/2 4 3/4 17/32 4 3/4 4 7/8 1 5/8 3/8 3/16 3 3/4 20 15 10 7 1/2

286U 14 14 7 5 1/2 5 1/2 17/32 4 3/4 4 7/8 1 5/8 3/8 3/16 3 3/4 25 20 - 10

324U 16 14 8 6 1/4 5 1/4 21/32 5 1/4 5 5/8 1 7/8 1/2 1/4 4 1/4 - 25 15 -

324S* 16 14 8 6 1/4 5 1/4 21/32 5 1/4 3 1/4 1 5/8 3/8 3/16 1 7/8 30 - - -

326U 16 15 1/2 8 6 1/4 6 21/32 5 1/4 5 5/8 1 7/8 1/2 1/4 4 1/4 - 30 20 15

326S* 16 15 1/2 8 6 1/4 6 21/32 5 1/4 3 1/4 1 5/8 3/8 3/16 1 7/8 40 - - -

364U 18 15 1/4 9 7 5 5/8 21/32 5 7/8 6 3/8 2 1/8 1/2 1/4 5 - 40 25 20

364US* 18 15 1/4 9 7 5 5/8 21/32 5 7/8 3 3/4 1 7/8 1/2 1/4 2 50 - - -

365U 18 16 1/4 9 7 6 1/8 21/32 5 7/8 6 3/8 2 1/8 1/2 1/4 5 - - 30 25

365US* 18 16 /14 9 7 6 1/8 21/32 5 7/8 3 3/4 1 7/8 1/2 1/4 2 60 50 - -

404U 20 16 1/4 10 8 6 1/8 13/16 6 5/8 7 1/8 2 3/8 5/8 5/16 5 1/2 - - 40 30

404US* 20 16 1/4 10 8 6 1/8 13/16 6 5/8 4 1/4 2 1/8 1/2 1/4 2 3/4 75 60 - -

405U 20 17 3/4 10 8 6 7/8 13/16 6 5/8 7 1/8 2 3/8 5/8 5/16 5 1/2 - - 50 40

405US* 20 17 3/4 10 8 6 7/8 13/16 6 5/8 4 1/4 2 1/8 1/2 1/4 2 3/4 100 75 - -

444U 22 1 11 9 7 1/4 13/16 7 1/2 8 5/8 2 3/8 3/4 3/8 7 - - 60 50

444US* 22 18 1/2 11 9 7 1/4 13/16 7 1/2 4 1/4 2 1/8 1/2 1/4 2 3/4 125 100 - -

445U 22 20 1/2 11 9 8 1/4 13/16 7 1/2 8 5/8 2 3/8 3/4 3/8 7 - - 75 60

445US* 22 20 1/2 11 9 8 1/4 13/16 7 1/2 4 1/4

2 1/8 1/2 1/4 2 3/4 150 125 - -

H143T 7 6 3 1/2 2 3/4 2 11/32 2 1/4 2 1/4 7/8 3/16 3/32 1 3/8 1 1/2 1 3/4 1/2

H145T 7 6 3 1/2 2 3/4 2 1/4 11/32 2 1/4 2 1/4 7/8 3/16 3/32 1 3/8 - 1 1/2 1 3/4

K145T 7 6 3 1/2 2 3/4 2 1/2 11/32 2 1/4 2 1/4 7/8 3/16 3/32 1 3/8 3, 2 2 - -

182T 9 6 1/2 4 1/2 3 3/4 2 1/4 13/32 2 3/4 2 3/4 1 1/8 1/4 1/8 1 3/4 5 3 1 1/2 1

184T 9 7 1/2 4 1/2 3 3/4 2 3/4 13/32 2 3/4 2 3/4 1 1/8 1/4 1/8 1 3/4 7 1/2 5 2 1 1/2

213T 10 1/2 7 1/2 5 1/4 4 1/4 2 3/4 13/32 3 1/2 33/8 1 3/8 5/16 5/32 2 3/8 10 7 1/2 3 2

215T 10 1/2 9 5 1/4 4 1/4 3 1/2 13/32 3 1/2 33/8 1 3/8 5/16 5/32 2 3/8 15 10 5 3

254T 12 1/2 10 3/4 6 1/4 5 41/8 17/32 4 1/4 4 1 5/8 3/8 3/16 2 7/8 20 15 7 1/2 5

256T 12 1/2 12 1/2 6 1/4 5 5 17/32 4 1/4 4 1 5/8 3/8 3/16 2 7/8 25 20 10 7 1/2

284T 14 12 1/2 7 5 1/2 4 3/4 17/32 4 3/4 4 5/8 1 7/8 1/2 1/4 3 1/4 - 25 15 10

284TS* 14 12 1/2 7 5 1/2 4 3/4 17/32 4 3/4 3 1/4 1 5/8 3/8 3/16 1 7/8 30 - - -

286T 14 14 7 5 1/2 5 1/2 17/32 4 3/4 4 5/8 1 7/8 1/2 1/4 3 1/4 - 30 20 15

286TS* 14 14 7 5 1/2 5 1/2 17/32 4 3/4 3 1/4 1 5/8 3/8 3/16 1 7/8 40 - - -

324T 16 14 8 6 1/4 5 1/4 21/32 5 1/4 5 1/4 2 1/8 1/2 1/4 3 7/8 - 40 25 20

324TS* 16 14 8 6 1/4 5 1/4 21/32 5 1/4 3 3/4 1 7/8 1/2 1/4 2 50 - - -

326T 16 15 1/2 8 6 /14 6 21/32 5 1/4 5 1/4 2 1/8 1/2 1/4 3 7/8 - 50 30 25

326TS* 16 15 1/2 8 6 1/4 6 21/32 5 1/4 3 3/4 1 7/8 1/2 1/4 2 60 - - -

364T 18 15 1/4 9 7 5 5/8 21/32 5 7/8 5 7/8 2 3/8 5/8 5/16 4 1/4 - 60 40 30

364TS* 18 15 1/4 9 7 5 5/8 21/32 5 7/8 3 3/4 1 7/8 1/2 1/4 2 75 - - -

365T 18 16 1/4 9 7 6 1/8 21/32 5 7/8 5 7/8 2 3/8 5/8 5/16 4 1/4 - 75 50 40

365TS* 18 16 1/4 9 7 6 1/8 21/32 5 7/8 3 3/4 1 7/8 1/2 1/4 2 100 - - -

404T 20 16 1/4 10 8 6 1/8 13/16 6 5/8 7 1/4 2 7/8 3/4 3/8 5 5/8 - 100 60 50

404TS* 20 16 1/4 10 8 6 1/8 13/16 6 5/8 4 1/4 2 1/8 1/2 1/4 2 3/4 125 - - -

405T 20 17 3/4 10 8 6 7/8 13/16 6 5/8 7 1/4

2 7/8 3/4 3/8 5 5/8 - 125 75 60

405TS* 20 17 3/4 10 8 6 7/8 13/16 6 5/8 4 1/4 2 1/8 1/2 1/4 2 3/4 150 - - -

444T 22 18 1/2 11 9 7 1/4 13/16 7 1/2 8 1/2 3 3/8 7/8 7/16 6 7/8 - - 100 75

444TS* 22 18 1/2 11 9 7 1/4 13/16 7 1/2 4 3/4 2 3/8 5/8 5/16 3 200 150 - -

445T 22 20 1/2 11 9 8 1/4 13/16 7 1/2 8 1/2 3 3/8 7/8 7/16 6 7/8 - - 125 100

445TS* 22 20 1/2 11 9 8 1/4 13/16 7 1/2 4 3/4 2 3/8 5/8 5/16 3 250 200 - -

* NEMA is believed to be a trademark and/or trade name of National Electrical Manufacturers

Association, and is not owned or controlled by Emerson Power Transmission Corp.