The Only DOM Tubing Size Chart You’ll Ever Need

Whether you’re building a roll cage, a hydraulic cylinder, or a structural framework, getting the tube dimensions right is non-negotiable. DOM tubing is one of the most widely used materials in precision fabrication, and for good reason. It’s clean, consistent, and built to tighter tolerances than standard ERW tubing. This guide covers what DOM tubing is, where it gets used, and a full DOM tubing size chart to help you spec the right dimensions the first time.

What Is DOM Tubing?

DOM stands for Drawn Over Mandrel. The process starts with an Electric Resistance Welded (ERW) tube, which is then cold-drawn over a mandrel to refine the ID, OD, and wall thickness simultaneously. The result is a tube with a more uniform internal surface, tight dimensional tolerances, and improved mechanical properties compared to standard ERW.

DOM tubing is typically produced from low-carbon steel, most often 1020 or 1026, and is available in a wide range of outside diameters and wall thicknesses. The drawing process also work-hardens the steel, boosting tensile and yield strength over the base material.

Application and Industry Uses

DOM tubing shows up across a wide range of industries and applications, often wherever tight tolerances and consistent wall concentricity actually matter:

• Automotive and motorsports: roll cages, chassis components, suspension links, and steering columns frequently spec DOM tubing for its strength-to-weight ratio and predictable performance under load.
• Hydraulic and pneumatic cylinders: the consistent ID is critical here. Any variance in the bore affects seal integrity and cylinder performance.
• Agricultural and heavy equipment: loader arms, lift systems, and structural members benefit from DOM’s strength and weldability.
• General fabrication: anywhere a cleaner, more dimensionally accurate tube is needed over standard ERW, DOM is the go-to option.
• Defense and aerospace: lower volume applications where the tighter tolerances and material consistency of DOM are worth the added cost.

Standard DOM Tubing Size Chart

The chart below covers common DOM tube dimensions available from domestic steel service centers and distributors. Dimensions are in inches; weight is approximate based on 1020/1026 steel density.

Note: This DOM tubing OD/ID chart represents standard stock sizes. Specialty sizes, thicker walls, and larger ODs are available but typically require minimum order quantities or longer lead times.

Common DOM Tubing Sizes

A few sizes account for the bulk of DOM tubing consumption in fabrication shops. 1″ OD with 0.083″ and 0.120″ walls are workhorses for motorsports chassis and structural applications. 1.5″ OD is a common choice for roll hoops and main hoop structures. 2″ OD shows up frequently in hydraulic cylinder applications, with wall thickness selected based on working pressure. For reference tube and precision bore applications, 0.75″ and 0.50″ OD with lighter walls are popular choices.

If you’re sourcing for a roll cage specifically, most sanctioning bodies (NASA, SCCA) publish minimum wall thickness requirements by tube diameter. Always verify against the rulebook before cutting.

How to Choose the Right Size for Your Project

Picking the right DOM tube dimensions comes down to a few key factors:

• Load requirements: higher loads demand larger OD or thicker walls. Thin-wall, large-OD tube resists bending well. Thick-wall, smaller-OD handles compression and crush loads better.
• Fit-up and mating components: if you’re sliding a shaft, rod, or fitting inside the tube, the ID on the DOM tubing OD/ID chart is your starting point. The DOM cold-drawn ID is close to the finished bore, though light machining may still be required for precision fits.
• Weight constraints: every 0.001″ of wall adds up. For motorsports fabrication, shaving weight on non-structural members is worth the time to optimize the wall selection.
• Availability: sticking to common stock sizes keeps lead times short and costs down. If a size isn’t on this DOM tubing size chart, expect either a longer wait or a higher price.
• Weld process: DOM is weldable with GMAW, GTAW, and SMAW. Thicker walls are more forgiving on fit-up gaps; lighter walls require tighter joint prep and travel speed control.

When in doubt, go thicker. A DOM tube isn’t cheap, but a part that fails in service costs far more than a few extra pounds of steel.

For sourcing, Metal Supermarkets stocks a wide range of DOM tubing sizes and offers a cutting service, so you can order material cut to length rather than dealing with full mill lengths. Browse their inventory at metalsupermarkets.com.