Starrett 54008 O1 Tool Steel Flat Stock 1/8x3x18 in

Product Description

The STARRETT 54008 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, and precision machining applications. Manufactured to AISI Type O1 specification, this flat stock measures 1/8 inch thick, 3 inches wide, and 18 inches long. Thickness tolerance is held to plus or minus 0.001 inches, and squareness is maintained at 0.003 inches per inch on all edges. These tight tolerances make the 54008 a reliable choice when accurate blanks are needed for punches, dies, gauges, and custom tooling. The bar ships in a single-piece quantity and weighs 1.91 pounds.

O1 tool steel flat stock of this size is commonly used in tool and die shops, maintenance departments, and precision fabrication environments. The 18-inch length provides enough material for multiple short blanks or a single longer workpiece. Machinists and tool makers select O1 stock for its predictable oil-quench hardening response and good dimensional stability after heat treatment. This piece is appropriate for both prototype and production tooling work in both job shop and in-plant settings.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable heat-treat response
• Thickness held to plus or minus 0.001 inches for precise blank work
• Width tolerance of 0.000 to minus 0.005 inches
• Length tolerance of plus 0.250 inches, minus 0 inches
• Edge squareness held to 0.003 inches per inch on all edges
• Ready-to-machine flat bar — no additional surface prep required before layout

Compatibility

Designed as a standard AISI O1 oil-hardening tool steel flat bar suitable for toolmaking, die making, gauge fabrication, and general precision machining applications where oil-quench hardenable stock is specified.

Installation Notes

Cutting and machining of tool steel flat stock should be performed by qualified machinists or tool makers using appropriate cutting fluids and carbide or HSS tooling. Heat treatment should follow AISI O1 guidelines and be performed in a controlled atmosphere or salt bath furnace to minimize scaling and decarburization. Allow the workpiece to cool to ambient temperature before finish grinding to final tolerance. Follow shop safety practices when handling bar stock with sharp edges.