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Motor Frame Size and Dimension Reference Tool
Horizontal Electric Motor
Vertical Electric Motor
Horizontal Electric Motor Frame Size Dimensions
NEMA MG1 4.4.1 Dimensions for Alternating-Current Foot-Mounted Machines with Single Straight Shaft Extension
Drawings represent standard TEFC general purpose motors and are for example or reference only
Frame Designation
A Max
D*
E†
2F†
BA***
H†
U
N-W
V Min
R
ES Min
S
AA Min††
42
—
2.62
1.75
1.69
2.06
0.28 slot
0.375
1.12
—
0.328
—
flat
—
48
—
3
2.12
2.75
2.5
0.34 slot
0.5
1.5
—
0.453
—
flat
—
48H
—
3
2.12
4.75
2.5
0.34 slot
0.5
1.5
—
0.453
—
flat
—
56
—
3.5
2.44
3
2.75
0.34 slot
0.625
1.88
—
0.517
1.41
0.188
—
56H
—
3.5
2.44
5
2.75
0.34 slot
0.625
1.88
—
0.517
1.41
0.188
—
143T
7
3.5
2.75
4
2.25
0.34 hole
0.875
2.25
2
0.771
1.41
0.188
4-Mar
145T
7
3.5
2.75
5
2.25
0.34 hole
0.875
2.25
2
0.771
1.41
0.188
4-Mar
182T
9
4.5
3.75
4.5
2.75
0.41 hole
1.125
2.75
2.5
0.986
1.78
0.25
4-Mar
184T
9
4.5
3.75
5.5
2.75
0.41 hole
1.125
2.75
2.5
0.986
1.78
0.25
4-Mar
213T
10.5
5.25
4.25
5.5
3.5
0.41 hole
1.375
3.38
3.12
1.201
2.41
0.312
1
215T
10.5
5.25
4.25
7
3.5
0.41 hole
1.375
3.38
3.12
1.201
2.41
0.312
1
254T
12.5
6.25
5
8.25
4.25
0.53 hole
1.625
4
3.75
1.416
2.91
0.375
1/1/2004
256T
12.5
6.25
5
10
4.25
0.53 hole
1.625
4
3.75
1.416
2.91
0.375
1/1/2004
284T
14
7
5.5
9.5
4.75
0.53 hole
1.875
4.62
4.38
1.591
3.28
0.5
1/1/2002
284TS
14
7
5.5
9.5
4.75
0.53 hole
1.625
3.25
3
1.416
1.91
0.375
1/1/2002
286T
14
7
5.5
11
4.75
0.53 hole
1.875
4.62
4.38
1.591
3.28
0.5
1/1/2002
286TS
14
7
5.5
11
4.75
0.53 hole
1.625
3.25
3
1.416
1.91
0.375
1/1/2002
324T
16
8
6.25
10.5
5.25
0.66 hole
2.125
5.25
5
1.845
3.91
0.5
2
324TS
16
8
6.25
10,50
5.25
0.66 hole
1.875
3.75
3.5
1.591
2.03
0.5
2
326T
16
8
6.25
12
5.25
0.66 hole
2.125
5.25
5
1.845
3.91
0.5
2
326TS
16
8
6.25
12
5.25
0.66 hole
1.875
3.75
3.5
1.591
2.03
0.5
2
364T
18
9
7
11.25
5.88
0.66 hole
2.375
5.88
5.62
2.021
4.28
0.625
3
364TS
18
9
7
11.25
5.88
0.66 hole
1.875
3.75
3.5
1.591
2.03
0.5
3
365T
18
9
7
12.25
5.88
0.66 hole
2.375
5.88
5.62
2.021
4.28
0.625
3
365TS
18
9
7
12.25
5.88
0.66 hole
1.875
3.75
3.5
1.591
2.03
0.5
3
404T
20
10
8
12.25
6.62
0.81 hole
2.875
7.25
7
2.45
5.65
0.75
3
404TS
20
10
8
12.25
6.62
0.81 hole
2.125
4.25
4
1.845
2.78
0.5
3
405T
20
10
8
13.75
6.62
0.81 hole
2.875
7.25
7
2.45
5.65
0.75
3
405TS
20
10
8
13.75
6.62
0.81 hole
2.125
4.25
4
1.845
2.78
0.5
3
444T
22
11
9
14.5
7.5
0.81 hole
3.375
8.5
8.25
2.88
6.91
0.875
3
444TS
22
11
9
14.5
7.5
0.81 hole
2.375
4.75
4.5
2.021
3.03
0.625
3
445T
22
11
9
16.5
7.5
0.81 hole
3.375
8.5
8.25
2.88
6.91
0.875
3
445TS
22
11
9
16.5
7.5
0.81 hole
2.375
4.75
4.5
2.021
3.03
0.625
3
447T
22
11
9
20
7.5
0.81 hole
3.375
8.5
8.25
2.88
6.91
0.875
3
447TS
22
11
9
20
7.5
0.81 hole
2.375
4.75
4.5
2.021
3.03
0.625
3
449T
22
11
9
25
7.5
0.81 hole
3.375
8.5
8.25
2.88
6.91
0.875
3
449TS
22
11
9
25
7.5
0.81 hole
2.375
4.75
4.5
2.021
3.03
0.625
3
440
—
11
9
**
7.5
—
—
—
—
—
—
—
—
500
—
12.5
10
**
8.5
—
—
—
—
—
—
—
—
Frame Designation
A Max
D*
E†
2F†
BA***
H†
U
N-W
V Min
R
ES Min
S
AA Min††
42
—
2.62
1.75
1.69
2.06
0.28 slot
0.375
1.12
—
0.328
—
flat
—
48
—
3
2.12
2.75
2.5
0.34 slot
0.5
1.5
—
0.453
—
flat
—
48H
—
3
2.12
4.75
2.5
0.34 slot
0.5
1.5
—
0.453
—
flat
—
56
—
3.5
2.44
3
2.75
0.34 slot
0.625
1.88
—
0.517
1.41
0.188
—
56H
—
3.5
2.44
5
2.75
0.34 slot
0.625
1.88
—
0.517
1.41
0.188
—
143T
7
3.5
2.75
4
2.25
0.34 hole
0.875
2.25
2
0.771
1.41
0.188
4-Mar
145T
7
3.5
2.75
5
2.25
0.34 hole
0.875
2.25
2
0.771
1.41
0.188
4-Mar
182T
9
4.5
3.75
4.5
2.75
0.41 hole
1.125
2.75
2.5
0.986
1.78
0.25
4-Mar
184T
9
4.5
3.75
5.5
2.75
0.41 hole
1.125
2.75
2.5
0.986
1.78
0.25
4-Mar
213T
10.5
5.25
4.25
5.5
3.5
0.41 hole
1.375
3.38
3.12
1.201
2.41
0.312
1
215T
10.5
5.25
4.25
7
3.5
0.41 hole
1.375
3.38
3.12
1.201
2.41
0.312
1
254T
12.5
6.25
5
8.25
4.25
0.53 hole
1.625
4
3.75
1.416
2.91
0.375
1/1/2004
256T
12.5
6.25
5
10
4.25
0.53 hole
1.625
4
3.75
1.416
2.91
0.375
1/1/2004
284T
14
7
5.5
9.5
4.75
0.53 hole
1.875
4.62
4.38
1.591
3.28
0.5
1/1/2002
284TS
14
7
5.5
9.5
4.75
0.53 hole
1.625
3.25
3
1.416
1.91
0.375
1/1/2002
286T
14
7
5.5
11
4.75
0.53 hole
1.875
4.62
4.38
1.591
3.28
0.5
1/1/2002
286TS
14
7
5.5
11
4.75
0.53 hole
1.625
3.25
3
1.416
1.91
0.375
1/1/2002
324T
16
8
6.25
10.5
5.25
0.66 hole
2.125
5.25
5
1.845
3.91
0.5
2
324TS
16
8
6.25
10,50
5.25
0.66 hole
1.875
3.75
3.5
1.591
2.03
0.5
2
326T
16
8
6.25
12
5.25
0.66 hole
2.125
5.25
5
1.845
3.91
0.5
2
326TS
16
8
6.25
12
5.25
0.66 hole
1.875
3.75
3.5
1.591
2.03
0.5
2
364T
18
9
7
11.25
5.88
0.66 hole
2.375
5.88
5.62
2.021
4.28
0.625
3
364TS
18
9
7
11.25
5.88
0.66 hole
1.875
3.75
3.5
1.591
2.03
0.5
3
365T
18
9
7
12.25
5.88
0.66 hole
2.375
5.88
5.62
2.021
4.28
0.625
3
365TS
18
9
7
12.25
5.88
0.66 hole
1.875
3.75
3.5
1.591
2.03
0.5
3
404T
20
10
8
12.25
6.62
0.81 hole
2.875
7.25
7
2.45
5.65
0.75
3
404TS
20
10
8
12.25
6.62
0.81 hole
2.125
4.25
4
1.845
2.78
0.5
3
405T
20
10
8
13.75
6.62
0.81 hole
2.875
7.25
7
2.45
5.65
0.75
3
405TS
20
10
8
13.75
6.62
0.81 hole
2.125
4.25
4
1.845
2.78
0.5
3
444T
22
11
9
14.5
7.5
0.81 hole
3.375
8.5
8.25
2.88
6.91
0.875
3
444TS
22
11
9
14.5
7.5
0.81 hole
2.375
4.75
4.5
2.021
3.03
0.625
3
445T
22
11
9
16.5
7.5
0.81 hole
3.375
8.5
8.25
2.88
6.91
0.875
3
445TS
22
11
9
16.5
7.5
0.81 hole
2.375
4.75
4.5
2.021
3.03
0.625
3
447T
22
11
9
20
7.5
0.81 hole
3.375
8.5
8.25
2.88
6.91
0.875
3
447TS
22
11
9
20
7.5
0.81 hole
2.375
4.75
4.5
2.021
3.03
0.625
3
449T
22
11
9
25
7.5
0.81 hole
3.375
8.5
8.25
2.88
6.91
0.875
3
449TS
22
11
9
25
7.5
0.81 hole
2.375
4.75
4.5
2.021
3.03
0.625
3
440
—
11
9
**
7.5
—
—
—
—
—
—
—
—
500
—
12.5
10
**
8.5
—
—
—
—
—
—
—
—
Tbl. 5.I.1
*The tolerances on the D dimension for rigid base motors shall be +0.00 inch, −0.06 inch. No tolerance has been established for the D dimension of resilient mounted motors.
†Frames 42 to 56H, inclusive—The tolerance for the 2F dimension shall be ±0.03 inch and for the H dimension (width of slot) shall be +0.02 inch, −0.00 inch.
Frames 143T to 500, inclusive—The tolerance for the 2E and 2F dimensions shall be ±0.03 inch and for the H dimension shall be +0.05 inch, −0.00 inch.
The values of the H dimension represent standard bolt sizes plus dimensional clearances.
H dimension:
Frames 143T to 365T, inclusive—The clearance of the std. bolt to hole size is 0.03 inch. The tolerance is +0.05, −0.00 inch.
Frames 404T to 449T, inclusive—The clearance of the std. bolt to hole size is 0.06 inch. The tolerance is +0.020 inch, −0.00 inch.
††For dimensions of clearance holes, see 4.8.
**For the 2F dimension and corresponding third (and when required, the fourth) digit in the frame series, see 4.2.1 and Table 4-2.
***BA tolerance: ±0.09 inch.
Notes:
For the meaning of the letter dimensions, see 4.1 and Figures 4-1 and 4-2.
For tolerances on shaft extension diameters and keyseats, see 4.9.
Frames 42 to 56H, inclusive—if the shaft extension length of the motor is not suitable for the application, it is recommended that deviations from this length be in 0.25 inch increments.
For cast-iron products, bottom of feet coplanar: 0.015 inch.
For cast-iron products, foot top parallel to foot bottom: 1.5 degree.
For cast-iron products, shaft parallel to foot plan: 0.015 inch.
NEMA MG1 4.4.4 Dimensions for Type C Face Mounting Foot or Footless Alternating-Current Motors
Drawings represent standard TEFC general purpose motors and are for example or reference only
Frame Designation*
AJ**
AK
BA
BB Min
BC
BD Max
BF Hole Number
BF Hole Tap Size
BF Hole Bolt Penetration Allowance
U
AH
Keyseat - R
Keyseat - ES Min
Keyseat - S
AA Min†††
42C
3.75
3
2.062
0.16†
-0.19
5.00††
4
1/4-20
—
0.375
1.312
0.328
—
Flat
—
48C
3.75
3
2.5
0.16†
-0.19
5.625
4
1/4-20
—
0.5
1.69
0.453
—
flat
—
56C
5.875
4.5
2.75
0.16†
-0.19
6.50††
4
3/8-16
—
0.625
2.06
0.517
1.41
0.188
—
143TC and 145TC
5.875
4.5
2.75
0.16†
0.12
6.50††
4
3/8-16
0.56
0.875
2.12
0.771
1.41
0.188
3/4
182TC and 184TC
7.25
8.5
3.5
0.25
0.12
9
4
1/2-13
0.75
1.125
2.62
0.986
1.78
0.25
3/4
182TCH and 184TCH
5.875
4.5
3.5
0.16†
0.12
6.50††
4
3/8-16
0.56
1.125
2.62
0.986
1.78
0.25
3/4
213TC and 215TC
7.25
8.5
4.25
0.25
0.25
9
4
1/2-13
0.75
1.375
3.12
1.201
2.41
0.312
1
254TC and 256TC
7.25
8.5
4.75
0.25
0.25
10
4
1/2-13
0.75
1.625
3.75
1.416
2.91
0.375
1-1/4
284TC and 286TC
9
10.5
4.75
0.25
0.25
11.25
4
1/2-13
0.75
1.875
4.38
1.591
3.28
0.5
1-1/2
284TSC and 286TSC
9
10.5
4.75
0.25
0.25
11.25
4
1/2-13
0.75
1.625
3
1.416
1.91
0.375
1-1/2
324TC and 326TC
11
12.5
5.25
0.25
0.25
14
4
5/8-11
0.94
2.125
5
1.845
3.91
0.5
2
324TSC and 326TSC
11
12.5
5.25
0.25
0.25
14
4
5/8-11
0.94
1.875
3.5
1.591
2.03
0.5
2
364TC and 365TC
11
12.5
5.88
0.25
0.25
14
8
5/8-11
0.94
2.375
5.62
2.021
4.28
0.625
3
364TSC and 365TSC
11
12.5
5.88
0.25
0.25
14
8
5/8-11
0.94
1.875
3.5
1.591
2.03
0.5
3
404TC and 405TC
11
12.5
6.62
0.25
0.25
15.5
8
5/8-11
0.94
2.875
7
2.45
5.65
0.75
3
404TSC and 405TSC
11
12.5
6.62
0.25
0.25
15.5
8
5/8-11
0.94
2.125
4
1.845
2.78
0.5
3
444TC and 445TC
14
16
7.5
0.25
0.25
18
8
5/8-11
0.94
3.375
8.25
2.88
6.91
0.875
3
444TSC and 445TSC
14
16
7.5
0.25
0.25
18
8
5/8-11
0.94
2.375
4.5
2.021
3.03
0.625
3
447TC and 449TC
14
16
7.5
0.25
0.25
18
8
5/8-11
0.94
3.375
8.25
2.88
6.91
0.875
3
447TSC and 449TSC
14
16
7.5
0.25
0.25
18
8
5/8-11
0.94
2.375
4.5
2.021
3.03
0.625
3
500 frame series
14.5
16.5
—
0.25
0.25
18
4
5/8-11
0.94
—
—
—
—
—
—
Frame Designation*
AJ**
AK
BA
BB Min
BC
BD Max
BF Hole Number
BF Hole Tap Size
BF Hole Bolt Penetration Allowance
U
AH
Keyseat - R
Keyseat - ES Min
Keyseat - S
AA Min†††
42C
3.75
3
2.062
0.16†
-0.19
5.00††
4
1/4-20
—
0.375
1.312
0.328
—
Flat
—
48C
3.75
3
2.5
0.16†
-0.19
5.625
4
1/4-20
—
0.5
1.69
0.453
—
flat
—
56C
5.875
4.5
2.75
0.16†
-0.19
6.50††
4
3/8-16
—
0.625
2.06
0.517
1.41
0.188
—
143TC and 145TC
5.875
4.5
2.75
0.16†
0.12
6.50††
4
3/8-16
0.56
0.875
2.12
0.771
1.41
0.188
3/4
182TC and 184TC
7.25
8.5
3.5
0.25
0.12
9
4
1/2-13
0.75
1.125
2.62
0.986
1.78
0.25
3/4
182TCH and 184TCH
5.875
4.5
3.5
0.16†
0.12
6.50††
4
3/8-16
0.56
1.125
2.62
0.986
1.78
0.25
3/4
213TC and 215TC
7.25
8.5
4.25
0.25
0.25
9
4
1/2-13
0.75
1.375
3.12
1.201
2.41
0.312
1
254TC and 256TC
7.25
8.5
4.75
0.25
0.25
10
4
1/2-13
0.75
1.625
3.75
1.416
2.91
0.375
1-1/4
284TC and 286TC
9
10.5
4.75
0.25
0.25
11.25
4
1/2-13
0.75
1.875
4.38
1.591
3.28
0.5
1-1/2
284TSC and 286TSC
9
10.5
4.75
0.25
0.25
11.25
4
1/2-13
0.75
1.625
3
1.416
1.91
0.375
1-1/2
324TC and 326TC
11
12.5
5.25
0.25
0.25
14
4
5/8-11
0.94
2.125
5
1.845
3.91
0.5
2
324TSC and 326TSC
11
12.5
5.25
0.25
0.25
14
4
5/8-11
0.94
1.875
3.5
1.591
2.03
0.5
2
364TC and 365TC
11
12.5
5.88
0.25
0.25
14
8
5/8-11
0.94
2.375
5.62
2.021
4.28
0.625
3
364TSC and 365TSC
11
12.5
5.88
0.25
0.25
14
8
5/8-11
0.94
1.875
3.5
1.591
2.03
0.5
3
404TC and 405TC
11
12.5
6.62
0.25
0.25
15.5
8
5/8-11
0.94
2.875
7
2.45
5.65
0.75
3
404TSC and 405TSC
11
12.5
6.62
0.25
0.25
15.5
8
5/8-11
0.94
2.125
4
1.845
2.78
0.5
3
444TC and 445TC
14
16
7.5
0.25
0.25
18
8
5/8-11
0.94
3.375
8.25
2.88
6.91
0.875
3
444TSC and 445TSC
14
16
7.5
0.25
0.25
18
8
5/8-11
0.94
2.375
4.5
2.021
3.03
0.625
3
447TC and 449TC
14
16
7.5
0.25
0.25
18
8
5/8-11
0.94
3.375
8.25
2.88
6.91
0.875
3
447TSC and 449TSC
14
16
7.5
0.25
0.25
18
8
5/8-11
0.94
2.375
4.5
2.021
3.03
0.625
3
500 frame series
14.5
16.5
—
0.25
0.25
18
4
5/8-11
0.94
—
—
—
—
—
—
Tbl. 5.I.2
All dimensions in inches.
*For frames 42C to 445TSC, see 4.4.1, for dimensions A, D, E, 2F, and H.
**For frames 182TC, 184TC, and 213TC through 500TC, the centerline of the bolt holes shall be within 0.025 inch of true location. True location is defined as angular and diametrical location with reference to the centerline of the AK dimension.
†The tolerance on this BB dimension shall be +0.00 inch, −0.06 inch.
††These BD dimensions are nominal dimensions.
†††For dimensions of clearance holes, see 4.8.
Notes:
For the meaning of the letter dimensions, see 4.1 and Figure 4-3.
For tolerances on shaft extension diameters and keyseats, see 4.9.
For tolerances on AK dimensions, face runout, and permissible eccentricity of mounting rabbet, see 4.12.
If the shaft extension length of the motor is not suitable for the application, it is recommended that deviations from this length be in 0.25 inch increments.
NEMA MG1 4.4.5 Dimensions for Type FC Face Mounting for Accessories on End Opposite Drive End of Alternating-Current Motors
Frame Designations
FAJ
FAK
FBB Min
FBD Min
FBF Hole Number
FBF Hole Tap Size
FBF Hole Bolt Penetration Allowance
Hole for Accessory Leads†† DP
Hole for Accessory Leads†† Diameter
143TFC and 145TFC
5.875
4.5
0.16*
6.50†
4
3/8-16
0.56
2.81
0.41
182TFC and 184TFC
5.875
4.5
0.16*
6.50†
4
3/8-16
0.56
2.81
0.41
213TFC and 215TFC
7.25
8.5
0.25
9
4
1/2-13
0.75
3.81
0.62
254TFC and 256TFC
7.25
8.5
0.25
10
4
1/2-13
0.75
3.81
0.62
284TFC and 286TFC
9
10.5
0.25
11.25
4
1/2-13
0.75
4.5
0.62
324TFC and 326TFC
11
12.5
0.25
14
4
5/8-11
0.94
5.25
0.62
Frame Designations
FAJ
FAK
FBB Min
FBD Min
FBF Hole Number
FBF Hole Tap Size
FBF Hole Bolt Penetration Allowance
Hole for Accessory Leads†† DP
Hole for Accessory Leads†† Diameter
143TFC and 145TFC
5.875
4.5
0.16*
6.50†
4
3/8-16
0.56
2.81
0.41
182TFC and 184TFC
5.875
4.5
0.16*
6.50†
4
3/8-16
0.56
2.81
0.41
213TFC and 215TFC
7.25
8.5
0.25
9
4
1/2-13
0.75
3.81
0.62
254TFC and 256TFC
7.25
8.5
0.25
10
4
1/2-13
0.75
3.81
0.62
284TFC and 286TFC
9
10.5
0.25
11.25
4
1/2-13
0.75
4.5
0.62
324TFC and 326TFC
11
12.5
0.25
14
4
5/8-11
0.94
5.25
0.62
Tbl. 5.I.3
*The tolerance on this FBB dimension shall be +0.00, −0.06 inch.
†This BD dimension is a nominal dimension.
††When a hole is required in the Type C face for accessory leads, the hole shall be located relative to one of the FBF holes in accordance with the following figure and the table.
Vertical Electric Motor Frame Size Dimensions
NEMA MG1 Table 18-28 - Dimensions for Type VP Vertical Solid Shaft, Single-Phase and Polyphase, Direct-Connected Squirrel-Cage Induction Motors for Vertical Turbine Pump Applications
Frame Designations*
AJ**
AK
BB Min
BD Max
BF clearance hole number
BF Clearnace Hole Size
U
V Min
AH†
Keyseat - R
Keyseat - ES (Min)
Keyseat - S
EU
143VP and 145VP
9.125
8.25
0.19
10
4
0.44
0.875
2.75
2.75
0.771-0.756
1.28
0.190-0.188
0.6875
182VP and 184VP
9.125
8.25
0.19
10
4
0.44
1.125
2.75
2.75
0.986-0.971
1.28
0.252-0.250
0.875
213VP and 215VP
9.125
8.25
0.19
10
4
0.44
1.125
2.75
2.75
0.986-0.971
1.28
0.252-0.250
0.875
254VP and 256VP
9.125
8.25
0.19
10
4
0.44
1.125
2.75
2.75
0.986-0.971
1.28
0.252-0.250
0.875
284VP and 286VP
9.125
8.25
0.19
10
4
0.44
1.125
2.75
2.75
0.986-0.971
1.28
0.252-0.250
0.875
324VP and 326VP
14.75
13.5
0.25
16.5
4
0.69
1.625
4.5
4.5
1.416-1.401
3.03
0.377-0.375
1.25
364VP and 365VP
14.75
13.5
0.25
16.5
4
0.69
1.625
4.5
4.5
1.416-1.401
3.03
0.377-0.375
1.25
404VP and 405VP
14.75
13.5
0.25
16.5
4
0.69
1.625
4.5
4.5
1.416-1.401
3.03
0.377-0.375
1.25
444VP and 445VP
14.75
13.5
0.25
16.5
4
0.69
2.125
4.5
4.5
1.845-1.830
3.03
0.502-0.500
1.75
447VP and 449VP
14.75
13.5
0.25
16.5
4
0.69
2.125
4.5
4.5
1.845-1.830
3.03
0.502-0.500
1.75
Frame Designations*
AJ**
AK
BB Min
BD Max
BF clearance hole number
BF Clearnace Hole Size
U
V Min
AH†
Keyseat - R
Keyseat - ES (Min)
Keyseat - S
EU
143VP and 145VP
9.125
8.25
0.19
10
4
0.44
0.875
2.75
2.75
0.771-0.756
1.28
0.190-0.188
0.6875
182VP and 184VP
9.125
8.25
0.19
10
4
0.44
1.125
2.75
2.75
0.986-0.971
1.28
0.252-0.250
0.875
213VP and 215VP
9.125
8.25
0.19
10
4
0.44
1.125
2.75
2.75
0.986-0.971
1.28
0.252-0.250
0.875
254VP and 256VP
9.125
8.25
0.19
10
4
0.44
1.125
2.75
2.75
0.986-0.971
1.28
0.252-0.250
0.875
284VP and 286VP
9.125
8.25
0.19
10
4
0.44
1.125
2.75
2.75
0.986-0.971
1.28
0.252-0.250
0.875
324VP and 326VP
14.75
13.5
0.25
16.5
4
0.69
1.625
4.5
4.5
1.416-1.401
3.03
0.377-0.375
1.25
364VP and 365VP
14.75
13.5
0.25
16.5
4
0.69
1.625
4.5
4.5
1.416-1.401
3.03
0.377-0.375
1.25
404VP and 405VP
14.75
13.5
0.25
16.5
4
0.69
1.625
4.5
4.5
1.416-1.401
3.03
0.377-0.375
1.25
444VP and 445VP
14.75
13.5
0.25
16.5
4
0.69
2.125
4.5
4.5
1.845-1.830
3.03
0.502-0.500
1.75
447VP and 449VP
14.75
13.5
0.25
16.5
4
0.69
2.125
4.5
4.5
1.845-1.830
3.03
0.502-0.500
1.75
Tbl. 5.I.4
The tolerance for the permissible shaft runout shall be 0.002 inch indicator reading (see 4.11).
For the meaning of the letter dimensions, see 4.1 and Figure 18-22.
For tolerance on AK dimension, face runout, and permissible eccentricity of mounting rabbet, see 4.12.
For tolerance on shaft extension diameters and keyseats, see 4.9 and 4.10.
*The assignment of horsepower and speed ratings to these frames shall be in accordance with Part 13, except for the inclusion of the suffix letter VP in place of the suffix letters T and TS.
**AJ dimension—centerline of bolt holes shall be within 0.025 inch of true location. True location is defined as angular and diametrical location with reference to the centerline of the AK dimension.
†The tolerance on the AH dimension shall be ±0.06 inch. Dimension AH shall be measured with motor in vertical position, shaft down.
NEMA MG1 Table 18-30 - Base Dimensions of Type P and PH Alternating-Current Squirrel-Cage Vertical Hollow Shaft Motors for Vertical Turbine Pump Applications
Item*
Frame Designation
AJ**
AK
BB Min
BD Max
Clearance
BF Tap Size
Number
EO Min
1
182TP
9.125
8.25
0.19
10
0.44
—
4
2.5
2
184TP
9.125
8.25
0.19
10
0.44
—
4
2.5
3
213TP
9.125
8.25
0.19
10
0.44
—
4
2.5
4
215TP
9.125
8.25
0.19
10
0.44
—
4
2.5
5
254TP
9.125
8.25
0.19
10
0.44
—
4
2.75
6
256TP
9.125
8.25
0.19
10
0.44
—
4
2.75
7
284TP†
9.125
8.25
0.19
10
0.44
—
4
2.75
8
286TP†
9.125
8.25
0.19
10
0.44
—
4
2.75
9
324TP†
14.75
13.5
0.25
16.5
0.69
—
4
4
10
326TP†
14.75
13.5
0.25
16.5
0.69
—
4
4
11
364TP†
14.75
13.5
0.25
16.5
0.69
—
4
4
12
365TP
14.75
13.5
0.25
16.5
0.69
—
4
4
13
404TP
14.75
13.5
0.25
16.5
0.69
—
4
4.5
14
405TP
14.75
13.5
0.25
16.5
0.69
—
4
4.5
15
444TP
14.75
13.5
0.25
16.5
0.69
—
4
5
16
445TP
14.75
13.5
0.25
16.5
0.69
—
4
5
17
—
14.75
13.5
0.25
0.69
—
4
—
18
—
14.75
13.5
0.25
0.69††
5/8-11
4
—
19
—
26
22
0.25
0.81††
3/4-10
4
—
324TPH
9.125
8.25
0.19
12
0.44
—
4
4
326TPH
9.125
8.25
0.19
12
0.44
—
4
4
284TPH
14.75
13.5
0.25
16.5
0.69
—
4
2.75
286TPH
14.75
13.5
0.25
16.5
0.69
—
4
2.75
Item*
Frame Designation
AJ**
AK
BB Min
BD Max
Clearance
BF Tap Size
Number
EO Min
1
182TP
9.125
8.25
0.19
10
0.44
—
4
2.5
2
184TP
9.125
8.25
0.19
10
0.44
—
4
2.5
3
213TP
9.125
8.25
0.19
10
0.44
—
4
2.5
4
215TP
9.125
8.25
0.19
10
0.44
—
4
2.5
5
254TP
9.125
8.25
0.19
10
0.44
—
4
2.75
6
256TP
9.125
8.25
0.19
10
0.44
—
4
2.75
7
284TP†
9.125
8.25
0.19
10
0.44
—
4
2.75
8
286TP†
9.125
8.25
0.19
10
0.44
—
4
2.75
9
324TP†
14.75
13.5
0.25
16.5
0.69
—
4
4
10
326TP†
14.75
13.5
0.25
16.5
0.69
—
4
4
11
364TP†
14.75
13.5
0.25
16.5
0.69
—
4
4
12
365TP
14.75
13.5
0.25
16.5
0.69
—
4
4
13
404TP
14.75
13.5
0.25
16.5
0.69
—
4
4.5
14
405TP
14.75
13.5
0.25
16.5
0.69
—
4
4.5
15
444TP
14.75
13.5
0.25
16.5
0.69
—
4
5
16
445TP
14.75
13.5
0.25
16.5
0.69
—
4
5
17
—
14.75
13.5
0.25
0.69
—
4
—
18
—
14.75
13.5
0.25
0.69††
5/8-11
4
—
19
—
26
22
0.25
0.81††
3/4-10
4
—
324TPH
9.125
8.25
0.19
12
0.44
—
4
4
326TPH
9.125
8.25
0.19
12
0.44
—
4
4
284TPH
14.75
13.5
0.25
16.5
0.69
—
4
2.75
286TPH
14.75
13.5
0.25
16.5
0.69
—
4
2.75
Tbl. 5.I.5
All dimensions in inches.
*See Table 18-31 for the coupling dimensions of the motors covered in items 1 through 16.
†These frames have the following alternative base dimensions, the coupling dimensions given in Table 18-31 remaining unchanged.
††Either clearance hole or up size shall be specified.
**AJ dimension—centerline of bolt holes shall be within 0.025 inch of true location. True location is defined as angular and diametrical location with reference to the centerline of the AK dimension.
JM and JP Face Mounting Close-Coupled Pump Motors
NEMA MG 1 Tables 18-33 and 18-34 Combined Dimensions for JM and JP Face Mounting Close-Coupled Pump Motors
Frame Designations
U
AH*
AJ**
AK
BB
BD Max
BF Number
BF Tap Size
BF Bolt Penetration Allowance
EL
143JM and 145JM
0.8745 - 0.8740
4.281 - 4.219
5.875
4.500 - 4.497
0.156 - 0.125
6.62
4
3/8-16
0.56
1.156 - 1.154
143JP and 145JP
0.8745 - 0.8740
7.343 - 7.281
5.875
4.500 - 4.497
0.156 - 0.125
6.62
4
3/8-16
0.56
1.156 - 1.154
182JM and 184JM
0.8745 - 0.8740
4.281 - 4.219
5.875
4.500 - 4.497
0.156 - 0.125
6.62
4
3/8-16
0.56
1.250 - 1.248
182JP and 184JP
0.8745 - 0.8740
7.343 - 7.281
5.875
4.500 - 4.497
0.156 - 0.125
6.62
4
3/8-16
0.56
1.250 - 1.248
213JM and 215JM
0.8745 - 0.8740
4.281 - 4.219
7.25
8.500 - 8.497
0.312 - 0.250
9
4
1/2-13
0.75
1.250 - 1.248
213JP and 215JP
1.2495 - 1.2490
8.156 - 8.094
7.25
8.500 - 8.497
0.312 - 0.250
9
4
1/2-13
0.75
1.750 - 1.748
254JM and 256JM
1.2495 - 1.2490
5.281 - 5.219
7.25
8.500 - 8.497
0.312 - 0.250
10
4
1/2-13
0.75
1.750 - 1.748
254JP and 256JP
1.2495 - 1.2490
8.156 - 8.094
7.25
8.500 - 8.497
0.312 - 0.250
10
4
1/2-13
0.75
1.750 - 1.748
284JM and 286JM
1.2495 - 1.2490
5.281 - 5.219
11
12.500 - 12.495
0.312 - 0.250
14
4
5/8-11
0.94
1.750 - 1.748
284JP and 286JP
1.2495 - 1.2490
8.156 - 8.094
11
12.500 - 12.495
0.312 - 0.250
14
4
5/8-11
0.94
1.750 - 1.748
324JM and 326JM
1.2495 - 1.2490
5.281 - 5.219
11
12.500 - 12.495
0.312 - 0.250
14
4
5/8-11
0.94
1.750 - 1.748
324JP and 326JP
1.2495 - 1.2490
8.156 - 8.094
11
12.500 - 12.495
0.312 - 0.250
14
4
5/8-11
0.94
1.750 - 1.748
364JP and 365JP
1.6245 - 1.6240
8.156 - 8.094
11
12.500 - 12.495
0.312 - 0.250
14
4
5/8-11
0.94
2.125 - 2.123
Frame Designations
U
AH*
AJ**
AK
BB
BD Max
BF Number
BF Tap Size
BF Bolt Penetration Allowance
EL
143JM and 145JM
0.8745 - 0.8740
4.281 - 4.219
5.875
4.500 - 4.497
0.156 - 0.125
6.62
4
3/8-16
0.56
1.156 - 1.154
143JP and 145JP
0.8745 - 0.8740
7.343 - 7.281
5.875
4.500 - 4.497
0.156 - 0.125
6.62
4
3/8-16
0.56
1.156 - 1.154
182JM and 184JM
0.8745 - 0.8740
4.281 - 4.219
5.875
4.500 - 4.497
0.156 - 0.125
6.62
4
3/8-16
0.56
1.250 - 1.248
182JP and 184JP
0.8745 - 0.8740
7.343 - 7.281
5.875
4.500 - 4.497
0.156 - 0.125
6.62
4
3/8-16
0.56
1.250 - 1.248
213JM and 215JM
0.8745 - 0.8740
4.281 - 4.219
7.25
8.500 - 8.497
0.312 - 0.250
9
4
1/2-13
0.75
1.250 - 1.248
213JP and 215JP
1.2495 - 1.2490
8.156 - 8.094
7.25
8.500 - 8.497
0.312 - 0.250
9
4
1/2-13
0.75
1.750 - 1.748
254JM and 256JM
1.2495 - 1.2490
5.281 - 5.219
7.25
8.500 - 8.497
0.312 - 0.250
10
4
1/2-13
0.75
1.750 - 1.748
254JP and 256JP
1.2495 - 1.2490
8.156 - 8.094
7.25
8.500 - 8.497
0.312 - 0.250
10
4
1/2-13
0.75
1.750 - 1.748
284JM and 286JM
1.2495 - 1.2490
5.281 - 5.219
11
12.500 - 12.495
0.312 - 0.250
14
4
5/8-11
0.94
1.750 - 1.748
284JP and 286JP
1.2495 - 1.2490
8.156 - 8.094
11
12.500 - 12.495
0.312 - 0.250
14
4
5/8-11
0.94
1.750 - 1.748
324JM and 326JM
1.2495 - 1.2490
5.281 - 5.219
11
12.500 - 12.495
0.312 - 0.250
14
4
5/8-11
0.94
1.750 - 1.748
324JP and 326JP
1.2495 - 1.2490
8.156 - 8.094
11
12.500 - 12.495
0.312 - 0.250
14
4
5/8-11
0.94
1.750 - 1.748
364JP and 365JP
1.6245 - 1.6240
8.156 - 8.094
11
12.500 - 12.495
0.312 - 0.250
14
4
5/8-11
0.94
2.125 - 2.123
Tbl. 5.I.6
Frame Designations
EM
EN Tap size
EN Tap Drill Penetration Allowance
EN - Bolt Penetration Allowance
EP Min
EQ*
ER Min
Keyseat - R
Keyseat - ES (Min)
Keyseat - S
ET*
143JM and 145JM
1.0000 - 0.9995
3/8-16
1.12
0.75
1.156
0.640 - 0.610
4.25
0.771-0.756
1.65
0.190-0.188
2.890 - 2.860
143JP and 145JP
1.0000 - 0.9995
3/8-16
1.12
0.75
1.156
1.578 - 1.548
7.312
0.771-0.756
1.65
0.190-0.188
5.952 - 5.922
182JM and 184JM
1.0000 - 0.9995
3/8-16
1.12
0.75
1.25
0.640 - 0.610
4.25
0.771-0.756
1.65
0.190-0.188
2.890 - 2.860
182JP and 184JP
1.0000 - 0.9995
3/8-16
1.12
0.75
1.25
1.578 - 1.548
7.312
0.771-0.756
1.65
0.190-0.188
5.952 - 5.922
213JM and 215JM
1.0000 - 0.9995
3/8-16
1.12
0.75
1.75
0.640 - 0.610
4.25
0.771-0.756
1.65
0.190-0.188
2.890 - 2.860
213JP and 215JP
1.3750 -1.3745
1/2-13
1.12
0.75
1.75
2.390 - 2.360
8.125
1.112 - 1.097
2.53
0.252-0.250
5.890 - 5.860
254JM and 256JM
1.3750 - 1.3745
1/2-13
1.5
1
1.75
0.640 - 0.610
5.25
1.112 - 1.097
2.53
0.252-0.250
3.015 - 2.980
254JP and 256JP
1.3750 -1.3745
1/2-13
1.5
1
1.75
2.390 - 2.360
8.125
1.112 - 1.097
2.53
0.252-0.250
5.890 - 5.860
284JM and 286JM
1.3750 - 1.3745
1/2-13
1.5
1
2.125
0.645 - 0.605
5.25
1.112 - 1.097
2.53
0.252-0.250
3.015 - 2.980
284JP and 286JP
1.3750 -1.3745
1/2-13
1.5
1
2.125
2.390 - 2.360
8.125
1.112 - 1.097
2.53
0.252-0.250
5.895 - 5.855
324JM and 326JM
1.3750 - 1.3745
1/2-13
1.5
1
2.125
0.645 - 0.605
5.25
1.112 - 1.097
2.53
0.252-0.250
3.015 - 2.980
324JP and 326JP
1.3750 -1.3745
1/2-13
1.5
1
2.125
2.395 - 2.355
8.125
1.112 - 1.097
2.53
0.252-0.250
5.895 - 5.855
364JP and 365JP
1.7500 - 1.7495
1/2-13
1.5
1
2.5
2.395 - 2.355
8.125
1.416 - 1.401
2.53
0.377 - 0.375
5.895 - 5.855
Frame Designations
EM
EN Tap size
EN Tap Drill Penetration Allowance
EN - Bolt Penetration Allowance
EP Min
EQ*
ER Min
Keyseat - R
Keyseat - ES (Min)
Keyseat - S
ET*
143JM and 145JM
1.0000 - 0.9995
3/8-16
1.12
0.75
1.156
0.640 - 0.610
4.25
0.771-0.756
1.65
0.190-0.188
2.890 - 2.860
143JP and 145JP
1.0000 - 0.9995
3/8-16
1.12
0.75
1.156
1.578 - 1.548
7.312
0.771-0.756
1.65
0.190-0.188
5.952 - 5.922
182JM and 184JM
1.0000 - 0.9995
3/8-16
1.12
0.75
1.25
0.640 - 0.610
4.25
0.771-0.756
1.65
0.190-0.188
2.890 - 2.860
182JP and 184JP
1.0000 - 0.9995
3/8-16
1.12
0.75
1.25
1.578 - 1.548
7.312
0.771-0.756
1.65
0.190-0.188
5.952 - 5.922
213JM and 215JM
1.0000 - 0.9995
3/8-16
1.12
0.75
1.75
0.640 - 0.610
4.25
0.771-0.756
1.65
0.190-0.188
2.890 - 2.860
213JP and 215JP
1.3750 -1.3745
1/2-13
1.12
0.75
1.75
2.390 - 2.360
8.125
1.112 - 1.097
2.53
0.252-0.250
5.890 - 5.860
254JM and 256JM
1.3750 - 1.3745
1/2-13
1.5
1
1.75
0.640 - 0.610
5.25
1.112 - 1.097
2.53
0.252-0.250
3.015 - 2.980
254JP and 256JP
1.3750 -1.3745
1/2-13
1.5
1
1.75
2.390 - 2.360
8.125
1.112 - 1.097
2.53
0.252-0.250
5.890 - 5.860
284JM and 286JM
1.3750 - 1.3745
1/2-13
1.5
1
2.125
0.645 - 0.605
5.25
1.112 - 1.097
2.53
0.252-0.250
3.015 - 2.980
284JP and 286JP
1.3750 -1.3745
1/2-13
1.5
1
2.125
2.390 - 2.360
8.125
1.112 - 1.097
2.53
0.252-0.250
5.895 - 5.855
324JM and 326JM
1.3750 - 1.3745
1/2-13
1.5
1
2.125
0.645 - 0.605
5.25
1.112 - 1.097
2.53
0.252-0.250
3.015 - 2.980
324JP and 326JP
1.3750 -1.3745
1/2-13
1.5
1
2.125
2.395 - 2.355
8.125
1.112 - 1.097
2.53
0.252-0.250
5.895 - 5.855
364JP and 365JP
1.7500 - 1.7495
1/2-13
1.5
1
2.5
2.395 - 2.355
8.125
1.416 - 1.401
2.53
0.377 - 0.375
5.895 - 5.855
Tbl. 5.I.7
All dimensions in inches.
For the meaning of the letter dimensions, see Figures
*AH, EQ, and ET dimensions measured with the shaft pulled by hand away from the motor to the limit of endplay.
**AJ dimension—centerline of bolt holes is within 0.015 inch of true location for frames 154 to 256 JM and JP, inclusive, and within 0.025 inch of true location for frames 284 to 365 JM and JP, inclusive. True location is determined as angular and diametrical location with reference to the centerline of the AK dimension.
Face runout—
143JM/JP to 256JM/JP frames, inclusive, 0.004 inch indicator reading
284JM/JP to 326JM/JP frames, inclusive, 0.006 inch indicator reading
Permissible eccentricity of mounting rabbet—
143JM/JP to 256JM/JP frames, inclusive, 0.004 inch indicator reading
284JM/JP to 326JM/JP frames, inclusive, 0.006 inch indicator reading
Permissible shaft runout—
143JM/JP to 256JM/JP frames, inclusive, 0.002 inch indicator reading
284JM/JP to 326JM/JP frames, inclusive, 0.003 inch indicator reading
Horizontal Electric Motor Frame Size Dimensions
TBD
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TBD
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Vertical Electric Motor Frame Size Dimensions
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Last updated on April 19th, 2024
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