Electrical Metallic Tubing

Electrical metallic tubing (EMT), also commonly called thin-wall, is a listed steel raceway of circular cross section, which is unthreaded, and nominally 10′ long. 20′ lengths are also available. EMT is available in trade sizes 1/2” through 4”. The outside is galvanized for corrosion protection and the inside has an approved corrosion-resistant organic coating. EMT is installed by use of set-screw or compression-type couplings and connectors. It is permitted to have an integral coupling comprised of an expanded, “belled” shape tube on one end with set screws. EMT with integral couplings is available in trade sizes 1-1/4 through 4.

Applicable Tolerance:

Outside Diameter: ±0.005 in (0.13 mm)

Wall Thickness: +10%~ -5%

The wall thickness shall not vary more than 0.003 in (0.08mm) throughout a 10 foot length

Length: ±0.25 in (6.4 mm)

Standard: UL797-2000

Finishes: Zinc Plated, Pre-galvanized

Zinc coated: class 3, 80-120 g/m2; class 4, 275-500 g/m2