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RIGID CONDUIT AND KNOCKOUT SIZES

Electrical metallic tubing is not threaded, and must be connected to junction boxes and the like with conduit connectors that secure to the tubing by means of a set screw or collet and nut; then the connectors have integrated shoulders and threads that secure to the box with a nut.

ALL SIZES ARE INCHES

INSIDE DIA. (ID)

WALL THK.

OUTSIDE DIA. (OD)

TRADE SIZE

NOM.

NOM.

NOM.

TOL.

3/8

0.493

0.042

0.577

+/- .005

1/2

0.622

0.042

0.706

+/- .005

3/4

0.824

0.049

0.922

+/- .005

1

1.049

0.057

1.163

+/- .005

1-1/4

1.379

0.065

1.509

+/- .005

1-1/2

1.609

0.065

1.740

+/- .005

2

2.067

0.065

2.197

+/- .005

* 2-1/2

2.731

0.072

* 2.875

+/- .010

* 3

3.356

0.072

* 3..500

+/- .015

* 3-1/2

3.834

0.083

* 4.000

+/- .020

* 4

4.334

0.083

* 4.500

+/- .020

* These sizes of EMT have the same nominal outside diameter as the corresponding size rigid conduit. EMT is sometimes called "thin-wall conduit".

ELECTRICAL METALLIC TUBING (EMT)

INTERMEDIATE METALLIC CONDUIT  (IMC)

PLASTIC CONDUIT BUSHING SIZES