©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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