Steel Tubing Size Chart Guide

Steel tubing size chart in some particular individual tubes are not randomly manufactured. Tube size is set up matching to dimensional series based on specific models. Tube dimensions are specified in inches.

The size of steel tubes belong to the significant characteristics of tubes. With this consideration tube dimensions must be given in such a way that can completely determine the tube. For steel tubes with circular cross section the three main dimensions except for the length are: outside diameter (OD), inside diameter (ID) and wall thickness (WT).

Steel Tubing Size Chart

The wall thickness of steel tubing is measured by gauge while thicker tubing is sized in fractions or millimeters. The lower the gauge number the thicker the wall thickness of the tube. For example 10 gauge tube measures out at a .134 in. wall thickness, although 20 gauge tube measures out at a .035 in. wall thickness. The gauge dimension also remains consistent among the various steel tubing sizes. For example, the thickness for 10 gauge tube will consistently measure .134 inches, whether it is 1-1/2 in. O.D., 2 in. O.D., or 4-1/2 in. O.D. tube.

Regarding to the type of tubes also belong the appropriate dimensions and the dimensional tolerances.

Common Steel Tubing Size and Gauge

The most commonly requested gauges of tubing are 10, 11, 12, 13, 14, 16, 18 and 20. This is the tube gauge. If you convert this to inches, the steel tubing size chart will looks like this:

  • 10 gauge = .134 inches
  • 11 gauge = .120 inches
  • 12 gauge = .109 inches
  • 13 gauge = .095 inches
  • 14 gauge = .083 inches
  • 16 gauge = .065 inches
  • 18 gauge = .049 inches
  • 20 gauge = .035 inches

A tube that has an outside diameter measuring 1.5 inches and a wall thickness measuring .065 inches is “named”, or called out as, “1-1/2 inch 16 gauge tube”.

When purchasing custom steel tube or designing a project that requires telescopic tube, it is important to know the right size. Tube gauge refers to the wall thickness of the tube and the gauge measurement will be consistent from tube size to tube size. If you still have questions relating to steel tubing size chart, don’t hesitate to contact us.