Steel Tube Stock | McMaster-Carr

Also known as mild steel, low-carbon steel is easy to machine, form, and weld. It's widely fabricated into parts that don’t require high strength, such as frames, supports, and conduit.

Low-Carbon Steel Rectangular Tubes

Also known as mild steel, low-carbon steel is easy to machine, form, and weld. These tubes are often fabricated into parts that don’t require high strength, such as frames, supports, and raceways.

Ultra-Strength Carbon Steel (AHSS) Round Tubes

The same steel used in automobile bodies, this AHSS (advanced high-strength steel) allows you to fabricate high-strength parts using thinner material than you could with other types of steel. It is formable, weldable, and more economical than alloy steel.

Easy-to-Weld 4130 Alloy Steel Round Tubes

Also known as chrome-moly steel, these 4130 alloy steel round tubes have low carbon content for good weldability. They’re often used for roll cages and frames.

Easy-to-Weld 4130 Alloy Steel Rectangular Tubes

Made from 4130 alloy steel, also known as chrome-moly steel, these tubes have low carbon content for good weldability. They’re often used for building frames and supports, since their flat sides make them easier to bolt than round tubes.

Multipurpose 4140 Alloy Steel Round Tubes

Made from alloy steel, also known as chrome-moly steel, these tubes resist fracturing from repeated stress. They’re used for a wide range of parts, including cylinders, rollers, and frames.

Hard Wear-Resistant 52100 Alloy Steel Tubes

Easier to machine than 52100 alloy steel rods, these extremely hard and wear-resistant tubes are often used to create bearings, bushings, and other cylindrical parts that are under constant stress. They’re also known as chrome steel.

Easy-to-Machine Gray Cast Iron Round Tubes

Gray cast iron machines faster with less wear on cutting tools than most types of steel. It's often fabricated into gears, pulleys, rollers, and bushings.

Steel Tubing

Smooth-Bore Seamless Steel Tubing

Seamless construction with no weld bead gives this tubing an interior with unrestricted flow. It can be flared without splitting.

Welded Steel Tubing

Tubing is welded with a smoothed weld bead on the inside to reduce particle buildup. It is also known as DOM (drawn over mandrel) tubing.

Vacuum-Rated Large-Diameter Steel Tubing

This tubing has the strength to withstand vacuum applications up to 29" Hg.

Precision Steel Tubing

With the lowest OD tolerance of all our steel tubing, this tubing is designed for precision applications.

Corrosion-Resistant Steel Tubing

A thin layer of zinc yellow-chromate gives this tubing extra corrosion resistance, making it an economical alternative to stainless steel.