Starrett 54437 O1 Tool Steel Flat Stock 1/2 X 1/2 X 36 in

Product Description

The STARRETT 54437 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, and precision machining applications. Manufactured from AISI Type O1 tool steel, this flat stock measures 0.5 inches thick, 0.5 inches wide, and 36 inches long, with a weight of 2.55 pounds. O1 tool steel is valued for its ability to harden uniformly in an oil quench, making it a reliable choice for cutting tools, punches, dies, gauges, and similar components that require a hard, wear-resistant surface after heat treatment. Licensed machinists, toolmakers, and metalworking fabricators regularly work with this material.

This flat stock is suited for job shop, production tooling, and maintenance environments where precision ground stock in standard sizes is needed for fabrication or direct use. The 36-inch length allows for multiple blanks to be cut from a single bar, reducing material waste. The square cross-section and tight dimensional tolerances make it ready for layout, machining, or grinding without significant pre-processing.

Key Features

• AISI Type O1 oil-hardening tool steel construction for consistent hardenability
• Thickness and squareness tolerance of plus or minus 0.001 inches for precision fitment
• Width tolerance of 0.000 to 0.005 inches under nominal
• Length tolerance of plus 0.015 inches over nominal
• Edge squareness held to 0.003 inches per inch across all edges
• 36-inch bar length provides flexibility for cutting multiple workpiece blanks

Compatibility

Designed as a standard O1 oil-hardening tool steel flat stock suitable for general toolmaking, die making, and precision fabrication applications requiring a 0.5 inch by 0.5 inch cross-section.

Installation Notes

O1 tool steel flat stock is worked by qualified machinists and toolmakers using conventional cutting, grinding, and milling equipment. When heat treating, follow established oil-quench procedures appropriate for AISI O1 material and allow proper tempering cycles to reduce brittleness. Always use appropriate personal protective equipment when cutting or grinding tool steel. Handle bar stock carefully to avoid nicking or distorting ground surfaces prior to use.