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NEMA Motor Frame Dimensions (inches)                   

If a motor does NOT have a frame size on the nameplate, you can in most cases identify the frame size by obtaining these key measurements:

U           = Shaft diameter 
2F         = Looking at the motor from the side, distance between 2 mounting holes
E(x2)    = Looking at the motor facing the shaft, distance between 2 mounting holes
D          = Height from base to CENTRE of the output shaft
AC       = Diameter of motor body (frames with ** : use the other 4 measurements 
                to determine
                frame size

For METRIC motors, see METRIC FRAME DIMENSIONS 

AC STANDARD Motors (all measurements in inches)
Green shaded frames: Obsolete but a transition base is available for replacement frames to match original installation (182/184, 213/215, U-frames)
Grey shaded frames: Obsolete. No transition base available.
Frame AC 
(body diameter)

(shaft diameter

(shaft height)
2F
 (Base holes)
E (x2)
 (Base holes)
- 3.3" 5/16",1/4",3/8" - - -
- 4.4" 5/16"1/4",3/8" - - -
42 5.0" 3/8",1/2" 2e" 1.69" 3.50"
48 5.6 3/8,1/2 3 2.75 4.24
56Z 6 1/2 3 2.75 4.24
56H 6 5/8 3.5 5.00 4.88
56 6" 5/8 3.5 3.00 4.88
56HZ 6 7/8 3.5 4.00/5.00 4.88
143 ** 3/4 3.5 4.00 5.50
143T ** 7/8 3.5 4.00 5.50
145 ** 3/4 3.5 5.00 5.50
145T ** 7/8 3.5 5.00 5.50
182 ** 7/8 4.5 4.50 7.50
182T ** 1c 4.5 4.50 7.50
184 ** 7/8 4.5 5.50 7.50
184T ** 1c 4.5 5.50 7.50
Frame AC 
(body diameter)

(shaft diameter

(shaft height)
2F
 (Base holes)
E (x2)
 (Base holes)
203 ** 3/4 5" 5.50 8.00
204 ** 3/4 5 6.50 8.00
213 ** 1c 5.25 5.50 8.50
213T ** 1d 5.25 5.50 8.50
215 ** 1c 5.25 7.00 8.50
215T ** 1d 5.25 7.00 8.50
224 ** 1 5.50 6.75 9.00
225 ** 1 5.50 6.75 9.00
254 ** 1c 6.25 8.25 10.00
254U ** 1d 6.25 8.25 10.00
254T ** 1e 6.25 8.25 10.00
256U ** 1d 6.25 10.00 10.00
256T ** 1e 6.25 10.00 10.00
284 ** 1 7 9.50 11.00
284U ** 1e 7 9.50 11.00
284T ** 1f 7 9.50 11.00
284TS ** 1e 7 9.50 11.00
Frame AC 
(body diameter)

(shaft diameter

(shaft height)
2F
 (Base holes)
E (x2)
 (Base holes)
286U ** 1e 7 11.00 11.00
286T ** 1f 7 11.00 11.00
286TS ** 1e 7 11.00 11.00
324 ** 1e 8 10.50 12.50
324U ** 1f 8 10.50 12.50
324S ** 1e 8 10.50 12.50
324T ** 2c 8 10.50 12.50
324TS ** 1f 8 10.50 12.50
326 ** 1e 8 12.00 12.50
326U ** 1f 8 12.00 12.50
326T ** 2c 8 12.00 12.50
364 ** 1f 9 11.25 14.00
364U ** 2c 9 11.25 14.00
364T ** 2d 9 11.25 14.00
365U ** 2c 9 12.25 14.00
404U ** 2d 10 12.25 16.00
404T ** 2f 10 12.25 16.00
405U ** 2d 10 13.75 16.00
405T ** 2f 10 13.75 16.00
444T ** 3d 11 14.50 18.00
445U ** 2f 11 16.50 18.00
Frame AC 
(body diameter)

(shaft diameter

(shaft height)
2F
 (Base holes)
E (x2)
 (Base holes)
Green shaded frames: Obsolete but a transition base is available for replacement frames to match original installation (182/184, 213/215, and most U-frames)
Grey shaded frames: Obsolete. No transition base available.

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If you have trouble identifying the frame size, please contact our office.

Bock Motors In Motion
Phone #416-674-2303 or #1 (213) 471-8671      Fax# 1 (866) 286-2089
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