Starrett 54439 O1 Tool Steel Flat Stock 1/2x3/4x36 in

Product Description

The STARRETT 54439 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, jig fabrication, and precision machining applications. Manufactured to AISI Type O1 specifications, this flat stock measures 0.5 inches thick, 0.75 inches wide, and 36 inches long, weighing 3.83 pounds. O1 tool steel offers excellent machinability in the annealed state and responds well to oil-quench hardening, making it a standard choice for punches, dies, gauges, and cutting tools. Machinists and tool-and-die makers specify this material when tight dimensional tolerances and consistent hardening response are required.

This flat stock is suited for job shops, toolrooms, and maintenance departments that machine or grind custom tooling from raw stock. Typical applications include fabricating blanks for stamps, punches, forming dies, and wear components. The 36-inch length allows multiple shorter blanks to be cut from a single piece, reducing material waste. It is also used in educational and prototype settings where O1 is preferred for its forgiving heat-treat characteristics compared to higher-alloy tool steels.

Key Features

• AISI Type O1 oil-hardening tool steel for consistent heat-treat response
• Thickness tolerance of plus or minus 0.001 inches for tight dimensional control
• Length tolerance of plus 0.015 inches, minus 0 inches
• Width tolerance of 0.000 to minus 0.005 inches
• Edge squareness held to 0.003 inches per inch on all edges
• 36-inch length provides stock for multiple blanks per bar

Compatibility

Designed as a standard O1 oil-hardening tool steel flat stock for general toolroom and machining use where AISI Type O1 material specification is required.

Installation Notes

Machining and grinding of tool steel flat stock should be performed by qualified machinists or tool-and-die makers using appropriate cutting fluids and HSS or carbide tooling. When heat treating, follow established oil-quench procedures for O1 tool steel and use proper personal protective equipment during quenching operations. Always allow the material to reach ambient temperature before measuring against final tolerance requirements. Consult material safety data for handling and cutting precautions.