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RIGID CONDUIT AND KNOCKOUT SIZES

(1) UL Table NAE.3.

(2) Maximum Outside Diameter Per ANSI C80.1-1977.

(3) Dimensions for trade sizes of 1/4 through 1-1/4 are from Table 20.2 of ANSI/UL 514-1978.
Sizes 1/ 2 " thru 6" per proposed revision to NEMA Engineering Bulletin No. 71, Aug. 1976.

INTERMEDIATE METALLIC CONDUIT  (IMC)

PLASTIC CONDUIT BUSHING SIZES

ELECTRICAL METALLIC TUBING (EMT)

Both rigid conduit and intermediate metallic conduit are threaded and accept couplings, nuts, and bushings et cetera directly.

ALL SIZES ARE INCHES

INSIDE DIA.

(ID)

OUTSIDE DIA. (OD)

KNOCK OUT SIZE

TRADE SIZE

THDS PER INCH

NOM. (1)

NOM.

MAX. (2)

NOM. (3)

1/4

18

0.364

0.540

N/A

0.575

3/8

18

0.493

0.675

N/A

0.718

1/2

14

0.634

0.840

0.855

0.875

3/4

14

0.836

1.050

1.066

1.109

1

11-1/2

1.063

1.315

1.331

1.375

1-1/4

11-1/2

1.394

1.660

1.676

1.734

1-1/2

11-1/2

1.624

1.900

1.916

1.984

2

11-1/2

2.083

2.375

2.399

2.469

2-1/2

8

2.489

2.875

2.904

2.969

3

8

3.090

3.500

3.535

3.594

3-1/2

8

3.569

4.000

4.040

4.123

4

8

4.050

4.500

4.545

4.641

4-1/2

8

4.506

5.000

5.050

5.109

5

8

5.073

5.563

5.619

5.719

6

8

6.093

6.625

6.691

6.813