A513 Cold Roll Carbon Steel Round Tubing 2-1/2 in OD - Strong

In this review the A513 Cold Roll Carbon Steel Round Tubing is evaluated for fabricators, hobby machinists, and repair technicians who need short, rigid tubing for shafts, pins, and structural sleeves. The bottom line: this 24 in length piece of drawn-over-mandrel A513 steel delivers excellent strength and uniform wall thickness for mechanical uses, with the biggest reason to buy being its rigidity and consistency meeting ASTM-A513 specifications. It is a straightforward choice when a durable 1018 carbon steel tube is required for functional parts rather than decorative work.

Key Features

• Material: A513 cold roll carbon steel provides high strength and rigidity for load-bearing and wear-prone components.
• Dimensions: The 2-1/2 in outside diameter and 2.125 in inside diameter give a predictable fit for shafts and bushings without excessive machining.
• Wall thickness: A 0.1875 in wall offers robust cross-section strength suitable for pins, rods, and short transmission parts.
• Length: The 24 in stock length is convenient for individual projects and trims down cleanly for custom lengths.
• Standard compliance: Meets ASTM-A513, which helps ensure uniform mechanical properties for engineering use.
• Typical uses: 1018 carbon steel composition is appropriate for spindles, sprockets, and shafts where toughness matters.

Who It's For

This tubing is best for machinists, welders, and repair technicians who need strong, dimensionally consistent carbon steel tubing for mechanical parts. It suits applications like fuel tank fittings, drive shafts, pin sleeves, and structural supports where rigidity and steel quality are priorities.

Those who need superior weldability or corrosion resistance may want to consider stainless alternatives or lower-carbon steels; likewise, projects demanding very tight inner-diameter tolerances should account for reports that the ID can be slightly smaller than nominal and plan for light reboring if necessary.

Pros & Cons

Pros

• High rigidity from A513 cold rolled steel makes it reliable for load-bearing parts.
• Solid dimensional specs-2-1/2 in OD, 2.125 in ID, 0.1875 in wall-provide repeatable results for machining and fits.
• Meets ASTM-A513 and uses 1018 carbon steel composition commonly used for shafts and pins.

Cons

• Lower machinability and weldability compared with lower-carbon steels can require adjusted cutting and welding practice.
• Some customers report the inner diameter can be slightly under nominal, so light reboring may be needed for precision fits.

Specifications

Standard	ASTM-A513
Material	A513 cold roll carbon steel (1018-type)
Outside Diameter	2-1/2 in
Inside Diameter	2.125 in
Wall Thickness	0.1875 in
Length	24 in

Our Verdict

The A513 Cold Roll Carbon Steel Round Tubing is a practical, value-oriented choice for anyone needing a short, strong section of 1018-style tubing for mechanical parts. It offers good steel quality, consistent dimensions, and ASTM compliance, making it well suited to shafts, pins, and structural sleeves; buyers should only plan for modest machining or ID adjustment when tight fits are required.

Frequently Asked Questions

Is this tubing weldable?
Yes, but A513 higher-carbon content means slightly lower weldability than low-carbon steels, so use appropriate filler and preheat when required.

Will the inner diameter fit a standard 2 in shaft?
The nominal ID is 2.125 in, but some customers report a slightly smaller ID; verify and bore to final size if a precise fit is needed.

Can it be used for sprockets and shafts?
Yes, the 1018-type composition and wall thickness make it suitable for pins, rods, shafts, spindles, and sprockets in many applications.