©Johnstone Supply eCatalog 216
MOTOR DEFINITIONS Electric Motor Terminology
NEMA Motor Dimension Standards
Frame
A
B
BA
D
2E
2F
H
N
U
V
KEY
48 56
5-3/4” 6-1/2”
3-5/8”
2-1/2” 2-3/4” 2-1/4”
3”
4-1/4” 4-7/8” 5-1/2”
2-3/4”
11/32”• 11/32”• 11/32”
1-19/32” 1-31/32” 2-5/16”
1/2” 5/8” 7/8”
1-1/2” 1-7/8” 2-1/8”
1” Full Flat
4” 5” 6”
3-1/2” 3-1/2”
3” 4” 5”
3-1/6” x 3-1/6” x 1-1/4” 3/16” x 3/16” x 1-1/8”
143T 7”
145T
182T 8-3/4”
5-3/4” 6-3/4” 7-1/4” 8-3/4” 10-1/4”
2-3/4”
4-1/2”
7-1/2”
4-1/2” 5-1/2” 5-1/2”
13/32”
2-25/32”
1-1/8”
2-7/8”
1/4” x 1/4” x 1-3/4”
184T
213T 10-3/8”
3-1/2”
5-1/4”
8-1/2”
13/32”
3-9/16”
1-3/8”
3-1/4”
5/16” x 2-1/8”
215T
7”
254T 12”
4-1/4”
6-1/4”
10”
8-1/4”
17/32”
4-13/16”
1-5/8”
3-7/8”
3/8” x 3/8” x 2-7/8”
256T
12”
10”
284T 13-7/8”
11-1/2”
4-3/4”
7”
11”
9-1/2” 9-1/2”
17-32”
4- 3/16” 3-13/16” 4-3/16” 3-13/16”
1-7/8” 1-5/8” 1-7/8” 1-5/8” 2-1/8” 1-7/8” 2-1/8” 1-7/8” 2-3/8” 1-7/8” 2-3/8” 1-7/8” 2-7/8” 2-1/8” 2-7/8” 2-1/8” 3-3/8” 2-3/8” 3-3/8” 2-7/8”
4-1/2” 3-1/8” 4-1/2” 3-1/8” 5-1/8” 3-7/8” 5-1/8” 3-7/8” 5-7/8” 3-1/2” 5-7/8” 3-1/2”
1/2” x 1/2” x 3-1/4” 3/8” x 3/8” x 1-7/8” 1/2” x 1/2” x 3-1/4” 3/8” x 3/8” x 1-7/8” 1/2” x 1/2” x 3-7/8”
284TS
286T 13-7/8”
13”
4-3/4”
7”
11”
11” 11”
17/32”
286TS
324T 15-7/8”
12-1/4”
5-1/4”
8”
12-1/2”
10-1/2” 10-1/2”
21/32”
5-1/2”
324TS
4”
1/2” x 1 /2” x 2”
326T 15-7/8”
13-3/4”
5-1/4”
8”
12-1/2”
12” 12”
21/32”
5-1/2”
1/2” x 1/2” x 3-7/8”
326TS
4”
1/2” x 1/2” x 2”
364T 17-3/4”
14-1/4”
5-7/8”
9”
14”
11-1/4” 11-1/4” 12-1/4” 12-1/4” 12-1/4” 12-1/4” 13-3/4” 13-3/4” 14-1/2” 14-1/2” 16-1/2” 16-1/2”
21/32”
6-1/8”
5/8” x 5/8” x 4-1/4”
364TS
4”
1/2” x 1/2” x 2”
365T 17-3/4”
14-1/4”
5-7/8”
9”
14”
21/32”
6-1/8”
5/8” x 5/8” x 4-1/4”
365TS
4”
1/2” x 1/2” x 2”
404T 19-3/4”
15”
6-5/8”
10”
16”
13/16”
7-1/2” 4-1/2” 7-1/2” 4-1/2” 8-3/4”
7” 4” 7” 4”
3/4” x 3/4” x 5-5/8” 1/2 “x 1/2” x 2-3/4” 3/4” x 3/4” x 5-5/8” 1/2” x 1/2” x 2-3/4” 7/8” x 7/8” x 6-7/8”
404TS
405T 19-3/4”
16-1/2”
6-5/8”
10”
16”
13/16”
405TS
444T 21-3/4”
17”
7-1/2”
11”
18”
13/16”
8-3/4”
444TS
5”
5”
5/8” x 5/8” x 3”
445T 21-3/4”
19”
7-1/2”
11”
18”
13/16”
8-3/4”
8-3/4”
7/8” x 7/8” x 6-7/8”
445TS 5/8” x 5/8” x 3” Note: T –Indicates long shaft for belt drive application. TS –Indicates short shaft for direct drive application. • –Slot A =Base width B =Base length 2E & 2F =Bolthole centers 5” 5”
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