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.

* 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

C-FACE

NEMA T FRAME DIMENSIONS

Nema
Series

N-W

AA
Size

BA*

XO/T^

Tap

Key Size
sq.

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

2 1/6

1/8

4 7/8

1 5/8

5 1/8

1/4-20(4)

3/64 Flat

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

2 1/2

1/8

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

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

1 3/4

10 3/4

1/2-13(4)

5/16

254T
256T

6 1/4

4 1/8
5

17/32

−

1 5/8

1 1/4

10 1/2

3 3/4

7 1/4

8 1/2

4 1/2*

1/4

2 1/4

1/2-13(4)

3/8

284T
284TS

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

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

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

5
3 1/2

12 1/2

5 1/4

1/4

2 5/8

16 1/8

5/8-11(4)

5/8
1/2

326T
326TS

2 1/8
1 7/8

5 1/4
3 3/4

5
3 1/2

5/8
1/2

364T
364TS

5 5/8

21/32

−

18 3/8

17 7/8

2 3/8
1 7/8

5 7/8
3 3/4

5 5/8
3 1/2

12 1/2

5 7/8

1/4

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

6 1/8

13/16

−

19 5/8

2 7/8
2 1/8

7 1/4
4 1/4

7
4

12 1/2

6 5/8

1/4

2 5/8

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

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

8 1/4
4 1/2

7 1/2

1/4

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 in the 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

−

143T

182

203

145T

184

204

182T

213

225

1 1/2

143T

182

203

145T

184

204

182T

184

224

184T

213

254

145T

184

204

145T

184

224

184T

213

225

213T

215

254

145T/182T

184

224

182T

213

225

213T

215

254

215T

254U

284

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

213T/215T

254U

284

215T

256U

324

256T

284

326

284T

286U

364

215T/254T

256U

324

254T

284U

326

284T

324U

364

286T

326U

365

254T/256T

284U/286U

326

256T

286U

364

286T

326U

365

324T

364U

404

256T/284TS

286U/324U

364S/365S

284T

324U

364/365

324T

364U

404

326T

365U

405

284TS/286TS

324S/326S

364S/404S

286T

326U

365/404

326T

365U

405

364T

404U

444

286TS/324TS

326S/364US

365S/405S

324T

364U

404/405

364T

404U

444

365T

405U

445

324TS/326TS

364US

404S/444S

326T

365US

405S/444S

365T

405U

445

404T

444U

504U

326TS/364TS

365US/405US

405S/445S

364TS

404US/405US

444S/445S

404T

444U

504U

405T

445U

505

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

QUICK REFERENCE MOTOR DIMENSIONS

RIGID MOUNT

C-FACE

NEMA T FRAME DIMENSIONS

PRIOR NEMA FRAME MTG DIMENSIONS

IEC/NEMA COMPARISON

NEMA FRAME ASSIGNMENTS - OPEN & TEFC

FRACTION/DECIMAL/MILLIMETER CONVERSIONS

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