• * Dimension D Will never be greater than the above values on rigid mount motors, but it may be less so that shims up to 1/32" thick (1/16" on 364U and 365U frames) may be required for certain machines.
  • @@ Motors designated 56H have two sets of 2F mounting holes--3" and 5".
  • $ Standard short shaft for direct drive applications.
  • # Discontinued "pre-NEMA" frame.
  • ** Base of 56HZ frame motors has holes and slots to match NEMA 56,56H,143T & 145T mounting dimensions.
  • & Dimension "V" is shaft length available for coupling, pinion or pulley hub--this is a minimum value.

NOTE:  any frame designation followed by either a "Z" or "Y" or "YZ" means that the motor has been changed and no longer follows these rules. The shaft may be different, ie, longer,  shorter, diameter, threaded, ect. And as a result is no longer a "standard" motor.

NEMA frame guide

The National Electrical Manufacturers Association (NEMA) has established industry-standard, base-mounted motor dimensions, which we have listed below. What this means, is that all motors manufactured under NEMA specifications, will have the same dimensions, regardless of who manufactured the motor. So, if a motor is a 143T frame, then all motors with a 143T frame will have the dimensions.

Electric

Motors


ALL DIMENSIONS IN INCHES


NEMA
FRAME
D*2E2FBA

H

(dia.)

N

Min.

U

Shaft

V

Min.

Key

Width

Key

Thick.

Key

Length

422 5/8
3 /121 11/162 1/169/32 slot1 1/83/8--3/64 flat
-
483
4 1/42 3/42 1/211/32 slot1 1/21/2--3/64 flat
-
48H34 1/44 3/42 1/211/32 slot
1 1/21/2--3/64 flat
-
563 1/24 7/832 3/411/32 slot
1 7/8
5/8
-3/16
3/16
1 3/8
56H3 1/24 7/83&5
2 3/411/32 slot
1 7/8
5/8
-3/16
3/16
1 3/8
56HZ3 1/2
********2 1/4
7/823/16
3/16
1 3/8
664 1/85 7/8
53 1/813/32 slot
2 1/4
3/4-3/16
3/16
1 7/8
143T3 1/25 1/2
42 1/4
11/32
2 1/4
7/823/16
3/16
1 3/8
145T3 1/2
5 1/2
52 1/4
11/32
2 1/4
7/8
23/16
3/16
1 3/8
146AT3 1/2
5 1/2
5 1/22 3/4
11/32
2 1/4
7/8
23/16
3/16
1 3/8
148AT3 1/2
5 1/2
72 3/4
11/32
2 1/4
7/8
23/16
3/16
1 3/8
149AT3 1/2
5 1/2
82 3/4
11/32
2 1/4
7/8
23/16
3/16
1 3/8
1412AT3 1/2
5 1/2
112 3/4
11/32
2 1/4
7/8
23/16
3/16
1 3/8
1824 1/2
7 1/2
4 1/22 3/4
13/32
2 1/4
7/8
23/16
3/16
1 3/8
1844 1/2
7 1/2
5 1/22 3/4
13/32
2 1/4
7/8
23/16
3/16
1 3/8
182T4 1/2
7 1/2
4 1/22 3/4
13/32
2 1/4
1 1/8
2 1/21/41/41 3/4
184T4 1/2
7 1/2
5 1/22 3/4
13/32
2 1/4
1 1/8
2 1/21/41/41 3/4
182AT4 1/27 1/24 1/22 3/4
13/32
2 1/4
1 1/8
21/41/41 3/8
L182ACY4 1/2
7 1/2
4 1/22 3/4
13/32
2 1/4
7/8
23/16
3/16
1 3/8
182AT
4 1/2
7 1/2
4 1/2
2 3/4
13/32
2 1/4
1 1/8
21/41/41 3/8
186ACY
4 1/2
7 1/2
7
2 3/4
13/32
2 1/4
7/8
23/16
3/16
1 3/8
186AT
4 1/2
7 1/2
72 3/4
13/32
2 1/4
1 1/8
21/41/41 3/8
L186AT
4 1/2
7 1/272 3/413/32
2 1/41 1/8
21/41/41 3/8
189AT4 1/2
7 1/2
102 3/4
13/32
2 1/4
1 1/8
2
1/4
1/4
1 3/8
203#5
85 1/2
3 1/8
13/32
2 1/4
3/42
3/16
3/16
1 3/8
204#
5
8
6 1/2
3 1/8
13/32
2 1/4
3/4
2
3/16
3/161 3/8
213
5 1/4
8 1/2
5 1/2
3 1/2
13/32
31 1/8
2 3/4
1/4
1/4
2
2155 1/4
8 1/2
73 1/2
13/32
31 1/8
2 3/4
1/4
1/4
2
213T5 1/4
8 1/2
5 1/2
3 1/2
13/32
3
1 3/83 1/8
5/16
5/16
2 3/8
215T5 1/4
8 1/2
73 1/2
13/32
3 3/81 3/8
3 1/8
5/16
5/16
2 3/8
219AT5 1/4
8 1/2
113 1/2
13/32
2 3/4
1 3/8
2 1/4
5/16
5/16
1 3/4
2110AT5 1/4
8 1/2
12 1/2
3 1/2
13/32
2 3/41 3/8
2 1/4
5/16
5/16
1 3/4
224#5 1/2
96 3/4
3 1/2
13/32
312 3/4
1/4
1/4
2
225#5 1/2
97 1/23 1/2
13/32
3
12 3/4
1/4
1/4
2
254#6 1/4
108 1/44 1/4
21/32
3 3/8
1 1/8
3 1/8
1/4
1/4
2 3/8
254U6 1/4
108 1/44 1/4
17/32
3 3/4
1 3/83 1/2
5/16
5/16
2 3/4
256U6 1/4
10104 1/4
17/32
3 3/41 3/8
3 1/2
5/16
5/16
2 3/4
254T6 1/4
108 1/44 1/4
17/32
41 5/8
3 3/4
3/8
3/8
2 7/8
256T6 1/4
10104 1/4
17/32
41 5/8
3 3/4
3/8
3/8
2 7/8
284#7119 1/24 3/4
17/32
3 3/4
1 1/4
3 1/2
1/41/4
2 3/4
284U7
119 1/24 3/4
17/32
4 7/8
1 5/84 5/8
3/83/8
3 3/4
286U7
11114 3/4
17/32
4 7/8
1 5/8
4 5/8
3/8
3/8
3 3/4
284T7119 1/24 3/4
17/32
4 5/8
1 7/8
4 3/8
1/2
1/2
3 1/4
286T711114 3/4
17/32
4 5/8
1 7/8
4 3/8
1/2
1/2
3 1/4
284TS71110 1/24 3/4
17/32
3 1/4
1 5/8
33/8
3/8
1 7/8
286TS711114 3/4
17/32
3 1/4
1 5/8
33/8
3/8
1 7/8
324#812 1/2
10 1/25 1/4
21/324 7/8
1 5/8
4 5/8
3/8
3/8
3 3/4
326#812 1/2
10 1/25 1/4
21/32
4 7/8
1 5/8
4 5/8
3/8
3/8
3 3/4
324U812 1/2
10 1/25 1/4
21/32
5 5/8
1 7/8
5 3/8
1/2
1/2
4 1/4
326U812 1/2
125 1/4
21/32
5 5/8
1 7/8
5 3/8
1/2
1/2
4 1/4
324T812 1/2
10 1/25 1/4
21/32
5 1/4
2 1/8
51/2
1/2
3 7/8
326T812 1/2
125 1/4
21/32
5 1/4
2 1/8
51/2
1/2
3 7/8
324TS812 1/2
10 1/2
5 1/4
21/32
3 3/4$
1 7/8$3 1/2$
1/2
1/2
2 $
326TS812 1/2125 1/4
21/32
3 3/4$
1 7/8$
3 1/2$1/2
1/2
2 $
364#91411 1/4
5 7/8
21/32
5 5/81 7/85 3/8
1/2
1/2
4 1/4
364S#91411 1/4
5 7/821/32
3 1/41 5/8
33/8
3/8
1 7/8
365#91412 1/4
5 7/821/32
5 5/81 7/8
5 3/8
1/2
1/2
4 1/4
364U91411 1/4
5 7/821/32
6 3/82 1/8
6 1/8
1/2
1/2
5
365U91412 1/4
5 7/821/32
6 3/82 1/8
6 1/8
1/2
1/2
5
364T91411 1/4
5 7/821/32
5 7/82 3/8
5 7/8
5/8
5/8
4 1/4
365T91412 1/45 7/821/32
5 7/8
2 1/8
5 7/8
5/8
5/8
4 1/4
364TS91411 1/4
5 7/821/32
3 3/4$
1 7/83 1/2
1/2
1/2
2 $
365TS91412 1/4
5 5/821/32
3 3/4$
1 7/8
3 1/2
1/2
1/2
2 $
404T
101612 1/46 5/8
13/16
7 1/4
2 7/8
73/4
3/4
5 5/8
405T
101613 3/4
6 5/8
13/16
7 1/4
2 7/8
73/4
3/4
5 5/8
404TS
101612 1/4
6 5/8
13/16
4 1/4
2 1/8
4
1/2
1/2
2 3/4
405TS
101613 3/4
6 5/8
13/16
4 1/4
2 1/8
4
1/2
1/2
2 3/4
404U101612 1/4
6 5/8
13/16
7 1/8
2 3/8
6 7/8
5/8
5/8
5 1/2
405U101613 3/46 5/8
13/16
7 1/8
2 3/8
6 7/8
5/8
5/8
5 1/2
444T
111814 1/27 1/2
13/16
8 1/2
3 3/8
8 1/4
7/8
7/8
6 7/8
445T,
447T &&
111816 1/27 1/2
13/16
8 1/2
3 3/8
8 1/4
7/8
7/8
6 7/8
444TS,
447TS&&		111814 1/27 1/2
13/16
4 3/4
2 3/8
4 1/2
5/8
5/8
3
445TS
111816 1/27 1/2
13/16
4 3/4
2 3/8
4 1/2
5/8
5/8
3
444U
111814 1/2
7 1/2
13/16
8 5/8
2 7/8
8 3/8
3/4
3/4
7
445U
111816 1/2
7 1/2
13/16
8 5/8
2 7/8
8 3/8
3/43/4
7
449T
1118257 1/2
13/16
8 1/2
3 3/8
8 1/4
7/8
7/8
6 7/8
449TS
1118257 1/213/16
4 3/4
2 3/8
4 1/2
5/8
5/8
3