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

Our review of the A513 Cold Roll Carbon Steel Round Tubing finds it best for machinists, fabricators, and hobbyists who need a strong, dimensionally consistent shafting or pin material. The single biggest reason to buy is its combination of high strength and adherence to ASTM A513 standards, which makes it suitable for load-bearing small parts like pins, rods, and spindles while still offering good value for money. The tube arrives as a 72 in length of cold-drawn 1018 carbon steel that balances rigidity with predictable mechanical performance.

Key Features

• A513 construction: Meets ASTM A513, providing a standardized material specification useful for mechanical and structural applications.
• Cold drawn finish: Drawn over mandrel for improved roundness and surface finish, which simplifies machining and fitting operations.
• Compact dimensions: 1/2 in outside diameter with a 0.26 in inside diameter and 0.12 in wall, offering consistent geometry for pins, shafts, and spindles.
• 1018 carbon steel: The material provides notable strength and rigidity suitable for components that see shear and bending loads.
• Long stock length: Supplied in a 72 in length, enabling multiple parts to be cut from a single piece and reducing the need for frequent reordering.

Who It's For

This tubing is aimed at professional fabricators, machine shops, and experienced hobbyists who need reliable, high-strength round tubing for mechanical parts such as pins, rods, shafts, spindles, and sprockets. The material and finish work well when straightness and surface quality matter and when components will be turned, milled, or pressed to fit.

Those who need excellent weldability or who require very high machinability may want to consider alternate, more weld-friendly steel alloys or lower-carbon options. Also, applications requiring very tight inside-diameter tolerances should check the fit first, since some users note the inner diameter can be slightly smaller than expected.

Pros & Cons

Pros

• High strength and rigidity from 1018 carbon construction make it ideal for load-bearing parts.
• Cold drawn over mandrel finish gives consistent roundness and a good surface for machining.
• Meets ASTM A513, providing a useful material spec for engineering and fabrication.
• Long 72 in length offers flexibility to cut multiple components from one piece.

Cons

• Lower machinability and weldability than lower-carbon steels, so some processes may require adjustments.
• Inner diameter may be slightly smaller than nominal on occasion, affecting tight-fit applications.

Specifications

Standard	ASTM A513
Material	1018 carbon steel
Outside diameter	1/2 in
Inside diameter	0.26 in
Wall thickness	0.12 in
Length	72 in

Our Verdict

The A513 Cold Roll Carbon Steel Round Tubing is a practical choice for users who need durable, standardized round stock for shafts, pins, and spindles. Its cold-drawn finish and ASTM A513 compliance deliver consistent geometry and strength at a reasonable price, though fabricators should account for slightly reduced weldability and possible minor variance in inner diameter when planning tight-tolerance assemblies.

Frequently Asked Questions

Is this tubing weldable?
Yes, but as 1018 carbon steel it has somewhat reduced weldability compared with lower-carbon steels, so appropriate welding procedures are advised.

Will the inner diameter be exact?
Most pieces are within expected dimensions, but some customers report a slightly smaller inner diameter, so verify fit for tight-tolerance bores.

Can this be used for shafts and pins?
Yes, the material and dimensions are commonly used for pins, rods, shafts, spindles, and sprockets.