4130 Alloy Steel Round Bar – 1" Diameter X 36" Length, Cold Finish, Normalized, AMS 6370

This 4130 alloy steel round bar is a versatile piece of metal that's great for all kinds of projects.

Also known as chromoly, 4130 offers a nice balance of strength, weldability, impact resistance, and machinability.

It's not too hard to work with but it's tough enough for serious structural applications.
The bar measures 1 inch in diameter and is 36 inches long – a good size for small parts or prototyping.

It comes with a cold finish and is normalized, which means it has consistent properties throughout.
4130 is used in structural components, gears, fasteners, and aircraft exteriors – basically anywhere you need strength without excessive weight.
It meets several key specs including ASTM-A108, AMS-6348, AMS-6370, and AMS/MIL-S-6758, so it's good for aerospace and defense work too.

The unpolished mill finish is ready to machine, weld, or heat-treat however you need.

If you're building something that needs to be both strong and workable, this bar is a solid starting point.