1.375 in A513 Cold Roll Carbon Steel Round Tubing - 72 in Length

In this review of the 1.375 in A513 cold roll carbon steel round tubing, the bottom line is practical: this tube is for fabricators and hobbyists who need a rigid, dimensionally stable steel tube for shafts, pins, or structural projects. The reviewer found the tubing offers strong material properties and consistent outer dimensions, making it a reliable choice when strength and rigidity matter. Our review highlights that while weldability and machining are slightly reduced compared with softer steels, the overall value, steel quality, and fit were positive in real-world use.

Key Features

• Material: A513 1018 carbon steel provides high strength and rigidity useful for load-bearing parts and mechanical components.
• Outer diameter: The 1.375 in outside diameter gives a predictable external size for press fits and fixture alignment.
• Inner diameter and wall: With a 1.063 in inner diameter and 0.156 in wall thickness, the tube balances stiffness and weight for shafts and spindles.
• Length: The 72 in length reduces joints and seams in longer assemblies, simplifying construction and alignment.
• Specification: Meets ASTM A513 standard, which ensures consistent manufacturing and predictable mechanical behavior.
• Common uses: Typical applications include pins, rods, shafts, spindles, and sprockets where solid mechanical performance is required.

Who It's For

This tubing is best for machinists, metal fabricators, and DIY mechanics who need a strong, sturdy tube for rotating parts, structural components, or repairs. The dimensional accuracy of the outer diameter makes it handy for press-fit operations, brackets, or replacing worn shaft material.

Users who require easy welding or aggressive machining may prefer a more weldable or softer steel grade; likewise, projects that need precise, larger inner bores may require reaming or selecting a different nominal ID because some customers noted a slightly smaller inner diameter in practice.

Pros & Cons

Pros

• Good material strength and rigidity for load-bearing mechanical parts.
• Consistent outer diameter that fits bearings and fixtures well in most applications.
• Long 72 in length reduces the need for splices and simplifies long runs.
• Meets ASTM A513, providing expected manufacturing consistency.

Cons

• Lower machinability and weldability compared with softer steels, requiring more effort or specialized tooling.
• Some customers report the inner diameter can be slightly smaller than nominal, so reaming may be necessary for tight-fit internal parts.

Specifications

Material	A513 1018 carbon steel
Outside diameter (OD)	1.375 in
Inside diameter (ID)	1.063 in
Wall thickness	0.156 in
Length	72 in
Standard	Meets ASTM A513

Our Verdict

The 1.375 in A513 cold roll tubing is a solid choice for anyone needing a strong, stable tube for shafts, rods, or structural uses; it delivers reliable outer dimensions and material strength at a reasonable value. Those needing easier welding or an exact inner bore should plan for additional machining, but for typical mechanical applications this tube represents good value and dependable performance.

Frequently Asked Questions

Is this tubing easy to weld?
The A513 1018 grade has slightly lower weldability than softer steels, so welding is possible but may require preheat or attention to technique.

Will the inner diameter be exact for bearing shafts?
Customers report generally accurate OD but some ID might be slightly smaller than nominal, so reaming or boring is recommended for tight internal fits.

What are common uses for this tubing?
Typical uses are pins, rods, shafts, spindles, and sprockets where strength and rigidity are priorities.