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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 Steel Conduit Sizes.

Conduit Size.

RIGID CONDUIT AND KNOCKOUT SIZES

PLASTIC CONDUIT BUSHING SIZES

INTERMEDIATE METALLIC CONDUIT (IMC)

ELECTRICAL METALLIC TUBING (EMT)

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