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QUICK REFERENCE MOTOR DIMENSIONS

 

The dimensions listed here are intended for reference purposes only. Dimensions shown in the shaded areas will not change from one brand to another for motors built to NEMA rigid base or “C” face mounted dimensional standards. Other dimensions shown are determined by the manufacturer rather than NEMA standards. Those listed are for LEESON® motors and may differ from other brands. Beware of NEMA frame suffix letters other than those listed above as they denote different mounting or shaft dimensions.

 

For example, suffix letter Y denotes special mounting provisions and Z denotes special shaft dimensions (as in 184TYZ for example). Motors having no suffix letters (other than NEMA frames 42, 48 and 56) are built to prior NEMA standards. Prefix letters are often used by manufacturers (as in G184T) to indicate the overall length of a motor but do not denote differences in the NEMA standardized mounting dimensions. 

 

The overall length (“C” dimension) will change with the enclosure, horsepower and speed for the same brand and will vary from one brand to another for motors of the same HP, speed or enclosure. For detailed dimensions of all LEESON motors, go to “products” then “product catalog” on www.leeson.com

* NEMA C face motors also having a rigid base have different BA dimensions in the following instances:

143TC & 145TC – 2 3/4” instead of 2 1/4”

182TC & 184TC – 3 1/2” instead of 2 3/4”

213TC & 215TC – 4 1/4” instead of 3 1/2”

254TC & 256TC – 4 3/4” instead of 4 1/4”

^ XO denotes clearance for the capacitors of single phase motors through the 215T frame. On three phase 254T frame and large motors, T denotes clearance for the lifting eyebolt.

 

                                                                       

                                                          RIGID MOUNT

 

Rigid Mount
Rigid Mount

 

                                                              C-FACE

C-Face
C face
     

NEMA T FRAME DIMENSIONS

 

Nema
Series		 D E F H N O P U N-W AA
Size		 AB AH AJ AK BA* BB BD XO/T^ XP Tap Key Size
sq.
42 2 5/8 1 3/4 27/32 9/32
Slot		 1 1/4 5 1/16 4 7/8 3/8 1 1/8 3/8 4.5 1 5/16 3 3/4 3 2 1/6 1/8 4 7/8 1 5/8 5 1/8 1/4-20(4) 3/64 Flat
48 3 2.125 1 3/8 11/32
Slot		 1 5/8 5 7/8 5 5/8 1/2 1 1/2 1/2 4 7/8 1 11/16 3 3/4 3 2 1/2 1/8 5 2 1/4 5 7/8 1/4-20(4) 3/64 Flat
56
56H		 3 1/2 2 7/16 1 1/2
2 1/2		 11/32
Slot		 2 6 7/8 6 5/8 5/8 1 7/8 1/2 5 3/8 2 1/16 5 7/8 4 1/2 2 3/4 1/8 6 1/2 2 1/4 7 1/4 3/8-16(4) 3/16
143T
145T		 3 1/2 2 3/4 2
2 1/2		 11/32 2 3/8 6 7/8 6 5/8 7/8 2 1/4 3/4 6 3/8 2 1/8 5 7/8 4 1/2 2 1/4* 1/8 6 1/2 2 1/4 7 1/4 3/8-16(4) 3/16
182T
184T		 4 1/2 3 3/4 2 1/4
2 3/4		 13/32 − 8 3/4 8 1/2 1 1/8 2 3/4 3/4 6 3/8 2 5/8 7 1/4 8 1/2 2 3/4* 1/4 8 7/8 2 1/2 9 1/8 1/2-13(4) 1/4
213T
215T		 5 1/4 4 1/4 2 3/4
3 1/2		 13/32 − 10 5/8 9 3/4 1 3/8 3 3/8 3/4 8 3/8 3 1/8 7 1/4 8 1/2 3 1/2* 1/4 9 1 3/4 10 3/4 1/2-13(4) 5/16
254T
256T		 6 1/4 5 4 1/8
5		 17/32 − 13 13 1 5/8 4 1 1/4 10 1/2 3 3/4 7 1/4 8 1/2 4 1/2* 1/4 10 2 1/4 13 1/2-13(4) 3/8
284T
284TS		 7 5 1/2 4 3/4 17/32 − 14 1/2 13 3/8 1 7/8
1 5/8		 4 5/8
3 1/4		 1 1/2 11 7/8 4 3/8
3		 9 10 1/2 4 3/4 1/4 11 1/4 2 1/4 14 1/2 1/2-13(4) 1/2
3/8
286T
286TS		 5 1/2 − 1 7/8
1 5/8		 4 5/8
3 1/4		 4 3/8
3		 1/2
3/8
324T
324TS		 8 6 1/4 5 1/4 21/32 − 16 1/8 15 7/8 2 1/8
1 7/8		 5 1/4
3 3/4		 2 13 5
3 1/2		 11 12 1/2 5 1/4 1/4 14 2 5/8 16 1/8 5/8-11(4) 5/8
1/2
326T
326TS		 6 2 1/8
1 7/8		 5 1/4
3 3/4		 5
3 1/2		 5/8
1/2
364T
364TS		 9 7 5 5/8 21/32 − 18 3/8 17 7/8 2 3/8
1 7/8		 5 7/8
3 3/4		 3 14 5 5/8
3 1/2		 11 12 1/2 5 7/8 1/4 14 2 5/8 18 3/8 5/8-11(8) 5/8
1/2
365T
365TS		 6 1/8 2 3/8
1 7/8		 5 7/8
3 3/4		 5 5/8
3 1/2		 5/8
1/2
404T
404TS		 10 8 6 1/8 13/16 − 20 19 5/8 2 7/8
2 1/8		 7 1/4
4 1/4		 3 16 7
4		 11 12 1/2 6 5/8 1/4 14 2 5/8 20 5/8-11(8) 3/4
1/2
405T
405TS		 6 7/8 2 7/8
2 1/8		 7 1/4
4 1/4		 7
4		 3/4
1/2
444T
444TS		 11 9 7 1/4
7 1/4		 13/16 − 21 3/4
21 3/4		 21 3/8
21 3/8		 3 3/8
2 3/8		 8 1/2
4 3/4		 3 20 8 1/4
4 1/2		 14 16 7 1/2 1/4 18 3
3		 21 1/2
21 1/2		 5/8-11(8) 7/8
5/8
445T
445TS		 8 1/4
8 1/4		 21 3/4
21 3/4		 21 3/8
21 3/8		 3 3/8
2 3/8		 8 1/2
4 3/4		 8 1/4
4 1/2		 3
3		 21 1/2
21 1/2		 7/8
5/8
447T
447TS		 10
10		 23
23		 22 3/4
22 3/4		 3 3/8
2 3/8		 8 1/2
4 3/4		 8 1/4
4 1/2		 3 1/4
3 1/4		 24
24		 7/8
5/8
449T
449TS		 12 1/2
12 1/2		 23
23		 23 3/8
23 3/8		 3 3/8
2 3/8		 8 1/2
4 3/4		 8 1/4
4 1/2		 3 1/4
3 1/4		 24
24		 7/8
5/8

 

 

PRIOR NEMA FRAME MTG DIMENSIONS

  D E F H U BA N-W Key
66 4 1/8 2 15/16 2 1/2 13/32 3/4 3 1/8 2 1/4 3/16
143
145		 3 1/2 2 3/4 2
2 1/2		 11/32 3/4 2 1/4 2 3/16
182
184		 4 1/2 3 3/4 2 1/4
2 3/4		 13/32 7/8 2 3/4 2 1/4 3/16
203
204		 5 4 2 3/4
3 1/4		 13/32 3/4 3 1/8 2 1/4 3/16
213
215		 5 1/4 4 1/4 2 3/4
3 1/2		 13/32 1 1/8 3 1/2 3 1/4
224
225		 5 1/2 4 1/2 3 3/8
3 3/4		 13/32 1 3 1/2 3 1/4
254
254U
256U		 6 1/4 5 4 1/8 17/32 1 1/8 4 1/4 3 3/8 1/4
5 1 3/8 3 3/4 5/16
284
284U
286U		 7 5 1/2 4 3/4 17/32 1 1/4 4 3/4 3 3/4 1/4
5 1/2 1 5/8 4 7/8 3/8
324
324U
326
326U		 8 6 1/4 5 1/4 21/32 1 5/8
1 7/8
1 5/8
1 7/8		 5 1/4 4 7/8
5 5/8
4 7/8
5 5/8		 3/8
1/2
3/8
1/2
6
364
364U
365
365U		 9 7 5 5/8 21/32 1 7/8
2 1/8
1 7/8
2 1/8		 5 7/8 5 5/8
6 3/8
5 5/8
6 3/8		 1/2
6 1/8
404
404U
405
405U		 10 8 6 1/8 13/16 2 1/8
2 3/8
2 1/8
2 3/8		 6 5/8 6 3/8
7 1/8
6 3/8
7 1/8		 1/2
5/8
1/2
5/8
6 7/8
444
444U
445
445U		 11 9 7 1/4 13/16 2 3/8
2 7/8
2 3/8
2 7/8		 7 1/2 7 1/8
8 5/8
7 1/8
8 5/8		 5/8
3/4
5/8
3/4
8 1/4
504U
505		 12 1/2 10 8
9		 15/16 2 7/8 8 1/2 8 5/8 3/4

 

 

 

IEC/NEMA COMPARISON

 

  DIMENSION IN MELLIMETERS KW/HP~ FRAME AS-
SIGNMENTS
3 Phase-TEFC
ICE
NEMA		 D E F H U BA N-W 2 Pole 4 Pole 6 Pole
56 56 45 35.5 5.8 9 36 20 − − −
NA − − − − − − − − − −
63 63 50 40 7 11 40 23 .25 KW .18 KW −
42 66.7 44.5 21.4 7.1 9.5 52.4 − 1/3 HP 1/4 HP −
71 71 56 45 7 14 45 30 .55 .37 −
48 76.2 54 34.9 8.7 12.7 63.5 38.1 3/4 1/2 −
80 80 62.5 50 10 19 50 40 1.1 .75 .55 KW
56 88.9 61.9 38.1 8.7 15.9 69.9 47.6 1 1/2 1 3/5 HP
90S 90 70 50 10 24 56 50 1.5 1.1 .75
143T 88.9 69.8 50.8 8.7 22.2 57.2 57.2 2 1 1/2 1
90L 90 70 62.5 10 24 50 54 2.2 1.5 1.1
145T 88.9 69.8 63.5 8.7 22.2 57.2 57.2 3 2 1 1/2
100L 100 80 70 12 28 63 60 3 2.2 1.5
NA − − − − − − − 4 3 2
112S 112 95 57 12 28 70 60 3.7 2.2 1.5
182T 114.3 95.5 57.2 10.7 28 70 69.9 5 3 2
112M 112 95 70 12 28 70 60 3.7 4 2.2
184T 114.3 95.2 68.2 10.7 28 70 69.9 5 5.4/5 −
132S 132 108 70 12 38 89 80 7.5 5.5 3
213T 133.4 108 69.8 10.7 34.9 89 85.7 10 7 1/2 −
132M 132 108 89 12 38 89 80 − 7.5 5.5
215T 134.4 108 88.8 10.7 34.9 89 85.7 − 10 7 1/2
160M+ 160 127 105 15 42 108 110 15 11 7.5
254T 158.8 127 104.8 13.5 41.3 108 101.6 20 15 10
160L+ 160 127 127 15 42 108 110 18.5 15 11
256T 158.8 127 127 13.5 41.3 108 101.6 25 20 15
180M+ 180 139.5 120.5 15 48 121 110 22 18.5 −
286T 177.8 139.8 120.2 13.5 47.6 121 117.5 − 25 −
180L+ 180 139.5 139.5 15 48 121 110 22 22 15
286T 177.8 139.8 139.8 13.5 47.6 121 117.5 30 30 20
200M+ 180 159 133.5 19 55 133 110 30 30 −
324T 230.3 158.8 133.4 16.7 54 133 133.4 40 40 −
200L+ 200 159 152.5 19 55 133 110 37 37 22
326T 203.2 158.8 152.4 16.7 54 133 133.4 50 50 30
225S+ 225 178 143 19 60 149 140 − 37 30
364T 228.6 117.8 142.8 16.7 60.3 149 149.2 − 50/75 40
225M+ 225 178 155.5 19 60 149 140 45 45 37
365T 228.6 177.8 155.6 16.7 60.3 149 149.2 60/75 60/75 50
250M+ 250 203 174.5 24 65 168 140 55 55 −
405T 254 203.2 174.6 20.6 73 168 184.2 75/100 75/100 −
280S+ 280 228.5 184 24 75 190 140 − − 45
444T 279.4 228.6 184.2 20.6 85.7 190 215.9 − − 60/100
280M+ 280 228.5 209.5 24 75 190 140 − − 55
445T 279.4 228.6 209.6 20.6 85.7 190 215.9 − − 75/125

 

+ Shaft dimensions of these IEC frames may vary between manufacturers.

 

~ Horsepower listed is closest comparable rating with similar mounting dimensions. In some instances, this results in a greater HP rating than required. For example, 37KW 4 pole converts to 50HP but nearest HP rating int he NEMA frame having comparable dimensions is 75HP. In these instances, the HP rating printed in black is the direct conversion, and HP printed in blue is the HP of the dimensionally desirable frame. OBSERVE CAUTION if the drive train or driven load is likely to be damaged by the greater HP.

 

Equivalent HP can be calculated by multiplying the KW rating by 1.341. Multiply HP by .7457 to convert HP to KW.

 

To convert from millimeters to inches, multiply by .03937 

 

To convert from inches to millimeters, multiply by 25.4

 

 

NEMA FRAME ASSIGNMENTS - OPEN & TEFC

NEMA
Frame
Program		 3600 RPM 1800 RPM 1200 RPM 900 RPM
T
Frames
1964		 U
Frames
1952		 Original
NEMA
Frames		 T
Frames
1964		 U
Frames
1952		 Original
NEMA
Frames		 T
Frames
1964		 U
Frames
1952		 Original
NEMA
Frames		 T
Frames
1964		 U
Frames
1952		 Original
NEMA
Frames
HP
1 − − − 143T 182 203 145T 184 204 182T 213 225
1 1/2 143T 182 203 145T 184 204 182T 184 224 184T 213 254
2 145T 184 204 145T 184 224 184T 213 225 213T 215 254
3 145T/182T 184 224 182T 213 225 213T 215 254 215T 254U 284
5 182T/184T 213 225 184T 215 254 215T 254U 284 254T 256U 324
7 1/2 184T/213T 215 254 213T 254U 284 254T 256U 324 256T 284U 326
10 213T/215T 254U 284 215T 256U 324 256T 284 326 284T 286U 364
15 215T/254T 256U 324 254T 284U 326 284T 324U 364 286T 326U 365
20 254T/256T 284U/286U 326 256T 286U 364 286T 326U 365 324T 364U 404
25 256T/284TS 286U/324U 364S/365S 284T 324U 364/365 324T 364U 404 326T 365U 405
30 284TS/286TS 324S/326S 364S/404S 286T 326U 365/404 326T 365U 405 364T 404U 444
40 286TS/324TS 326S/364US 365S/405S 324T 364U 404/405 364T 404U 444 365T 405U 445
50 324TS/326TS 364US 404S/444S 326T 365US 405S/444S 365T 405U 445 404T 444U 504U
60 326TS/364TS 365US/405US 405S/445S 364TS 404US/405US 444S/445S 404T 444U 504U 405T 445U 505
75 364TS/365TS 404US/444US 444S/504S 365TS 405US/444US 445S/504S 405T 445U 505 444T − −
100 365TS/405TS 405US/445US 445S/505S 404TS/405TS 444US/445US 504S/505S 444T − − 445T − −
125 404TS/444TS 444US 504S 405TS/444TS 445US 505S 445T − − − − −
150 405TS/445TS 445US 505S 444TS/445TS − − − − − − − −
200 444TS − − 445TS − − − − − − − −
250 445TS − − − − − − − − − − −

 

 

FRACTION/DECIMAL/MILLIMETER CONVERSIONS

Inch-
Fraction		 Inch-
Decimal		 Millimeter Inch-
Fraction		 Inch-
Decimal		 Millimeter Inch-
Fraction		 Inch-
Decimal		 Millimeter Inch-
Fraction		 Inch-
Decimal		 Millimeter
1/64 0.015625 0.397 17/64 0.265615 6.747 33/64 0.515625 13.097 49/64 0.765725 19.447
1/32 0.03125 0.794 9/32 0.28125 7.144 17/32 0.53125 13.494 25/32 0.78125 19.844
3/64 0.046875 1.191 19/64 0.296875 7.541 35/64 0.546875 13.891 51/64 0.796875 20.241
1/16 0.0625 1.588 5/16 0.3125 7.938 9/16 0.5625 14.288 13/16 0.8125 20.638
5/64 0.078125 1.984 21/64 0.328125 8.334 37/64 0.578125 14.684 53/64 0.828125 21.034
3/32 0.09375 2.381 11/32 0.34375 8.731 19/32 0.59375 15.081 27/32 0.84375 21.431
7/64 0.109375 2.778 23/64 0.359375 9.128 39/64 0.609375 15.478 55/64 0.859375 21.828
1/8 0.125 3.175 3/8 0.375 9.525 5/8 0.625 15.875 7/8 0.875 22.225
9/64 0.140625 3.572 25/64 0.390625 9.921 41/64 0.640625 16.272 57/64 0.890625 22.622
5/32 0.15625 3.969 13/32 0.40625 10.319 21/32 0.65625 16.669 29/32 0.90625 23.019
11/64 0.171875 4.366 27/64 0.421875 10.716 43/64 0.671875 17.066 59/64 0.921875 23.416
3/16 0.1875 4.762 7/16 0.4375 11.112 11/16 0.6875 17.462 15/16 0.9375 23.812
13/64 0.203125 5.129 29/64 0.453125 11.509 45/64 0.703125 17.859 61/64 0.953125 24.209
7/32 0.21875 5.556 15/32 0.46875 11.906 23/32 0.71875 18.256 31/32 0.96875 24.606
15/64 0.234375 5.953 31/64 0.484375 12.303 47/64 0.734375 18.653 63/64 0.984375 25.003
1/4 0.25 6.350 1/2 0.50 12.700 3/4 0.75 19.050 1 1.00 25.400

 

MM Inch MM Inch
1 0.039 14 0.5519
2 0.079 15 0.5906
3 0.1181 16 0.63
4 0.1575 17 0.6693
5 0.1969 18 0.7087
6 0.2362 19 0.748
7 0.2756 20 0.7874
8 0.315 21 0.8268
9 0.3543 22 0.8661
10 0.3937 23 0.9055
11 0.4331 24 0.9449
12 0.4724 25 0.9843
13 0.5119
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