Seamless Steel | McMaster-Carr

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751 Products

About Metal Tubing

Low-Carbon Steel Round Tubes

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.

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.

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 304 Stainless Steel

From cookware to chemical-processing equipment, 304 stainless steel is a good all-around choice for a wide range of applications.

Polished Multipurpose 304 Stainless Steel

Polished to either a brushed or mirror-like finish, this material is often used to fabricate decorative enclosures and industrial workstations.

Corrosion-Resistant 316 Stainless Steel

The addition of molybdenum gives 316 stainless steel excellent corrosion resistance. Use it in a variety of marine and chemical-processing applications.

Tight-Tolerance Hardened 440C Stainless Steel

With a diameter that’s held to a close tolerance, this material is hardened for increased wear and abrasion resistance.

Metal Tubing for Flow

Smooth-Bore Seamless Stainless Steel Tubing

This tubing has a seamless construction with no weld bead for unrestricted flow and is stronger than welded tubing.

Extreme-Pressure Stainless Steel Tubing

This tubing is suitable for extreme-pressure applications reaching 15,000 psi—the highest pressure rating of all the tubing we offer.

Mil. Spec. Stainless Steel Tubing

A titanium additive gives this tubing excellent strength and superior corrosion resistance. It meets MIL-T-8808.

Stainless Steel Tubing for Corrosive Gases

A thin layer of silicon on the interior provides a smooth surface and offers protection against corrosive gases.

Extra-Hard Stainless Steel Tubing

Compared to other stainless steel tubing, this tubing is harder, stronger, and more durable.

Cleaned and Capped Stainless Steel Tubing

This tubing comes cleaned and capped to prevent moisture and dirt from contaminating the inside.

High-Polish Stainless Steel Tubing
for Pharmaceuticals with Certification

This premium-grade tubing is polished to a 20 Ra or 15 Ra finish on the inside to reduce particle buildup and allow for easy cleaning.

Extreme-Pressure Miniature Stainless Steel Tubing

This tubing withstands high pressures up to 13,700 psi. It is also known as capillary 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.

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.

About Metal Tubing

Metal

Low-Carbon Steel Round Tubes

Multipurpose 4140 Alloy Steel Round Tubes

Easy-to-Weld 4130 Alloy Steel Rectangular Tubes

Multipurpose 304 Stainless Steel

Polished Multipurpose 304 Stainless Steel

Corrosion-Resistant 316 Stainless Steel

Tight-Tolerance Hardened 440C Stainless Steel

Metal Tubing for Flow

Smooth-Bore Seamless Stainless Steel Tubing

Extreme-Pressure Stainless Steel Tubing

Mil. Spec. Stainless Steel Tubing

Stainless Steel Tubing for Corrosive Gases

Extra-Hard Stainless Steel Tubing

Cleaned and Capped Stainless Steel Tubing

High-Polish Stainless Steel Tubingfor Pharmaceuticals with Certification

Extreme-Pressure Miniature Stainless Steel Tubing

Smooth-Bore Seamless Steel Tubing

Corrosion-Resistant Steel Tubing

High-Polish Stainless Steel Tubing
for Pharmaceuticals with Certification