A513 Cold Roll Carbon Steel Round Tubing 2 in OD - Durable, Drawn

Our review of the A513 cold roll carbon steel round tubing finds it best suited for fabricators, HVAC installers, and automotive hobbyists who need a strong, consistent metal tube with a smooth bore. The single biggest reason to buy is the combination of a drawn over mandrel weld and cold rolling process, which produces a more consistent wall thickness and improved yield strength compared with standard welded or hot rolled tubing. For projects like fuel lines, HVAC runs, shafts, or custom fittings, this tubing delivers dependable mechanical properties and practical dimensions.

Key Features

• A513 construction: meets ASTM A513 for consistent manufacturing quality and predictable material behavior in structural and fluid transfer uses.
• Drawn over mandrel: produces a smoother internal bore and tighter dimensional control than non-drawn welded tube, which helps with fluid flow and fitting alignment.
• Cold rolled finish: increases yield strength and hardness compared with hot rolled tubing, giving extra durability for mechanical and structural applications.
• Dimensional match: 2 in outside diameter with a 1.76 in inside diameter and 0.12 in wall provides a common fractional tubing size suitable for pins, shafts, and fluid lines.
• Length and material: supplied as a 48 in length of 1018 carbon steel, a grade commonly used for pins, rods, and spindles where strength and machinability balance is needed.

Who It's For

This tubing is aimed at professionals and experienced DIYers working on automotive, HVAC, or light industrial projects who need consistent wall thickness and stronger cold-rolled material. It is a good choice for fabricators making shafts, spacer rods, or custom fittings where the smoother bore and dimensional repeatability matter.

Those who require superior weldability or very high corrosion resistance should look elsewhere; because this is higher-carbon 1018 steel in a cold-rolled form, it has slightly reduced weldability compared with low-carbon steels and is not a stainless alloy.

Pros & Cons

Pros

• Good material strength and rigidity for mechanical parts and structural uses.
• Smoother internal bore from drawn over mandrel processing improves flow and fit.
• Reliable dimensional control and consistent wall thickness for repeatable fabrication.

Cons

• Higher carbon content means slightly lower weldability compared with low-carbon tubing.
• Inner diameter may read slightly smaller than nominal in some pieces, according to some users.

Specifications

Standard	ASTM A513
Material	1018 cold roll carbon steel
Outside diameter	2.00 in
Inside diameter	1.76 in
Wall thickness	0.12 in
Length	48 in
Manufacture	Welded, drawn over mandrel, cold rolled

Our Verdict

The A513 cold roll 2 in round tubing is a practical, well-made option for anyone needing a durable, dimensionally consistent steel tube for automotive, HVAC, or light industrial work. It is good value when strength, a smoother bore, and predictable wall thickness are priorities; buyers who need exceptional weldability or stainless corrosion resistance should consider alternative alloys.

Frequently Asked Questions

Is this tubing suitable for fuel lines?
Yes, customers report successful use in fuel-related applications such as GM fuel tank work, but ensure fittings and compatibility for your specific fuel and pressure.

Can this be welded easily?
It can be welded, but 1018 cold-rolled steel has slightly reduced weldability compared with lower-carbon steels, so use appropriate technique and filler material.

Are dimensions exact to spec?
Dimensions are manufactured to the stated sizes, though some users note the inside diameter can be slightly smaller than expected, so verify fit for precision applications.