Starrett 54443 O1 Tool Steel Flat Stock 0.5x2x36 in

Product Description

The STARRETT 54443 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die work, jig fabrication, and precision machining applications. Manufactured to AISI Type O1 material specification, this flat stock measures 0.5 inches thick, 2 inches wide, and 36 inches long, with a weight of 10.2 pounds. Thickness tolerance is held to plus or minus 0.001 inches, making this stock suitable for applications where dimensional consistency is critical before and after heat treatment. It is stocked in a pre-hardened-ready, annealed condition and is intended for professionals who will machine, grind, or fit the stock before oil-hardening in-house.

O1 tool steel flat stock is used across machine shops, toolrooms, and fabrication facilities for producing punches, dies, blades, gauges, and fixtures. The 36-inch length provides a full bar for layout and cutting to finished blank size. The 2-inch width and 0.5-inch thickness suit a wide range of medium-duty toolmaking applications. This bar is appropriate for machinists, tool-and-die makers, and skilled fabricators working to close tolerances on tooling components.

Key Features

• AISI Type O1 oil-hardening tool steel construction for reliable heat-treat response
• Thickness held to plus or minus 0.001 inches for consistent pre-machining stock removal
• Width tolerance of 0.000 to 0.005 inches under nominal for predictable fit in fixtures and vises
• Length tolerance of plus 0.015 inches, minus 0 inches — full-length material guaranteed
• Edge squareness held to 0.003 inches per inch across all edges
• Full 36-inch bar length suitable for cutting multiple blanks from a single piece

Compatibility

Designed as a standard AISI O1 oil-hardening tool steel flat bar suitable for general toolmaking, die making, and precision fabrication applications requiring a medium-alloy, oil-quench hardenable steel stock.

Installation Notes

Machining and grinding of O1 tool steel flat stock should be performed by a qualified machinist or tool-and-die maker using appropriate cutting fluids and tooling rated for tool steel. Heat treatment, including oil hardening and tempering, must follow established metallurgical procedures and should be carried out by personnel with proper furnace equipment and safety training. Always wear appropriate PPE when cutting, grinding, or heat-treating tool steel. Consult the material safety data sheet for handling guidance specific to tool steel stock.