A513 Cold Roll Carbon Steel Round Tubing 1.375 in OD - Durable

In this review of the A513 Cold Roll Carbon Steel Round Tubing the bottom line is simple: this is a solid, no-nonsense length of drawn-over-mandrel tubing for fabricators who need strength and consistent wall dimensions. The reviewer found it most valuable for mechanical parts and repair tasks where rigidity matters, and notes that it meets ASTM-A513. If you need a strong, industrial-grade tube for pins, shafts, or custom spindles, this tubing's combination of 1018 carbon steel and a 0.375 in wall makes it a practical choice despite slightly reduced machinability compared with lower-carbon steels.

Key Features

• Material and grade: Made from A513/1018 carbon steel, the tubing delivers reliable strength and rigidity for load-bearing parts.
• Precise OD and wall: The 1.375 in outside diameter and 0.375 in wall provide sturdy, predictable dimensions for press fits and structural use.
• Use-ready length: Supplied in a 24 in length, the tube is convenient for short runs, repairs, and prototyping without extra cutting for many projects.
• Manufacturing method: Drawn over mandrel construction yields a smoother finish and better roundness than some other processes, aiding alignment in assemblies.
• Standards compliance: Meets ASTM-A513, giving confidence for industrial and engineering applications where specification matters.

Who It's For

This tubing is aimed at machinists, hobby fabricators, and maintenance technicians who need a strong, standard-length section of carbon steel tubing for components such as pins, rods, shafts, spindles, and sprockets. Its heavy wall and drawn-over-mandrel finish suit applications where rigidity and concentricity matter more than extreme ease of machining.

Those who require exceptionally easy weldability, very large lengths, or a larger inner diameter for fluid flow should look elsewhere; the 0.625 in ID and 0.375 in wall make it less suited to high-flow plumbing or thin-wall projects where lighter tubing would be preferable.

Pros & Cons

Pros

• High strength and rigidity from A513/1018 carbon steel make it reliable in structural and rotating parts.
• Drawn over mandrel process yields good roundness and surface quality for alignment-critical uses.
• Meets ASTM-A513, which helps ensure consistency for engineering applications.

Cons

• Inner diameter can be slightly smaller than expected in some pieces, which may affect press-fit tolerances.

Specifications

Our Verdict

The A513 Cold Roll Carbon Steel Round Tubing is a practical, value-oriented choice for anyone building or repairing mechanical components that need strength and concentricity. It is especially good for pins, shafts, and spindles where a heavy wall and ASTM-A513 compliance matter. Buyers who need effortless welding or oversized ID for fluid work should evaluate alternatives, but for most machining and structural uses this tube represents solid value.

Frequently Asked Questions

Is this tubing weldable?
Yes, it is weldable, but as a higher-carbon 1018 alloy it has slightly lower weldability than lower-carbon steels; proper technique is recommended.

Will the inner diameter accept standard bearings?
The 0.625 in ID is suitable for many fitments, but some customers report a slightly smaller ID on occasion, so measure before final assembly.

Is the length exact?
The tube is supplied at 24 in length and is ready for cutting or machining to fit project needs.