Starrett 57057 O1 Tool Steel Flat Stock 1x2x18 in

Product Description

The STARRETT 57057 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, jig and fixture fabrication, and precision machining applications. It measures 1 inch thick, 2 inches wide, and 18 inches long. Thickness and width tolerances run from +0.0100 to +0.0150 inches, and length tolerance is +0.2500 inches. Edge squareness is held to 0.003 inches per inch across all edges. The AISI Type O1 designation means this stock is intended for oil-quench hardening, making it appropriate for components that require high wear resistance and dimensional stability after heat treatment. Machinists and tool and die professionals stock this material for precision ground tooling blanks and wear parts.

This flat stock is used in industrial and maintenance shop environments where close-tolerance tool steel bar is required in the annealed condition prior to heat treating. Typical applications include punches, dies, gauges, bushings, and general tooling blanks. The 18-inch length provides enough working stock for multiple smaller components to be laid out and cut from a single bar. It is suitable for use in both job shop and production toolroom settings.

Key Features

• AISI Type O1 oil-hardening tool steel for high wear resistance after heat treatment
• Thickness: 1 inch with +0.0100 to +0.0150 inches tolerance
• Width: 2 inches with +0.0100 to +0.0150 inches tolerance
• Length: 18 inches with +0.2500 inches tolerance
• Edge squareness held to 0.003 inches per inch on all edges
• Supplied in annealed condition ready for machining and subsequent oil quench hardening

Compatibility

Designed as a standard O1 oil-hardening tool steel flat stock bar suitable for toolroom and die shop applications requiring AISI Type O1 material in the 1 inch by 2 inch cross-section profile.

Installation Notes

Machining and heat treatment of tool steel flat stock should be performed by qualified toolmakers or machinists familiar with O1 oil-hardening procedures. Follow applicable shop safety practices when cutting, grinding, or machining tool steel. Oil quench hardening requires proper furnace equipment and quench media handling procedures — consult the material specification and applicable shop safety guidelines before heat treating. Handle the bar with care to avoid nicking or bending the precision-ground surfaces prior to use.