Starrett 57047 O1 Oil-hardening Flat Stock 0.75x2.5x18 in

Product Description

The STARRETT 57047 is an O1 oil-hardening flat stock bar made from AISI Type O1 tool steel. It measures 0.75 inches thick, 2.5 inches wide, and 18 inches long, and weighs 9.56 pounds. O1 tool steel is a general-purpose oil-hardening grade known for its machinability in the annealed state and its ability to achieve high hardness after heat treatment. This flat stock is used by tool and die makers, machinists, and metalworking professionals to fabricate dies, punches, gauges, and custom tooling. Tight dimensional tolerances and a squared edge profile make it ready for layout and machining directly from stock.

This flat stock is suited for job shop, toolroom, and production machining environments where O1 tool steel is specified. It is a standard choice for short-run die work, fixture components, and precision tooling blanks. The 18-inch length provides enough material for multiple parts from a single piece. Edge squareness is held to 0.003 inches per inch across all edges, supporting accurate layout without additional grinding on the reference faces.

Key Features

• AISI Type O1 oil-hardening tool steel for reliable heat-treat response and high as-hardened wear resistance
• Thickness tolerance of +0.0100 to +0.0150 inches for consistent stock removal allowance
• Width tolerance of +0.0100 to +0.0150 inches
• Length tolerance of +0.2500 inches
• Edge squareness held to 0.003 inches per inch on all edges
• Single-piece package quantity with no minimum order above one piece

Compatibility

Designed as a standard O1 oil-hardening tool steel flat stock blank for toolroom and die-making applications requiring AISI Type O1 material in 0.75 inch by 2.5 inch cross-section.

Installation Notes

Machining and heat treatment of O1 tool steel should be performed by qualified machinists and tool and die makers familiar with tool steel handling. The material is supplied in the annealed condition and requires oil quenching during hardening — follow the steel supplier or heat treater recommendations for soak temperature and quench procedure. Use appropriate cutting fluids and carbide or high-speed steel tooling when machining. Handle with care after hardening, as hardened tool steel is brittle and susceptible to cracking from impact or thermal shock.