Starrett 54421 O1 Tool Steel Flat Stock 3/8x6x36 in

Product Description

The STARRETT 54421 is an O1 oil-hardening tool steel flat stock bar measuring 3/8 inch thick, 6 inches wide, and 36 inches long. Manufactured to AISI Type O1 material specification, this flat stock is suited for toolmakers, machinists, and die makers who require a precision-ground, heat-treatable steel blank ready for further machining or direct use. Thickness tolerance is held to plus or minus 0.001 inches, and squareness is maintained to 0.003 inches per inch on all edges, making it suitable for precision tooling applications where dimensional consistency is critical. The bar weighs approximately 22.94 pounds.

O1 oil-hardening tool steel flat stock is commonly used in industrial and commercial machine shops for fabricating punches, dies, jigs, fixtures, gauges, and other precision tooling components. This bar is appropriate for applications where the stock will be rough-machined to near-final dimensions and then oil-quench hardened to achieve the desired surface hardness and wear resistance. The 36-inch length provides sufficient material for multiple smaller blanks or a single long tool form, and the 6-inch width accommodates wide die plates or large flat tooling components.

Key Features

• AISI Type O1 oil-hardening tool steel material specification
• Thickness tolerance of plus or minus 0.001 inches for consistent stock removal planning
• Length tolerance of plus 0.015 inches, ensuring full nominal length delivery
• Width tolerance of 0.000 to minus 0.005 inches for predictable fit in precision fixtures
• Squareness held to 0.003 inches per inch on all edges
• Ready for oil-quench hardening after machining to final form

Compatibility

Designed as a standard O1 oil-hardening tool steel flat stock blank suitable for machining, grinding, and heat treating in toolroom and die shop applications.

Installation Notes

Cutting, grinding, and machining of tool steel flat stock should be performed by qualified machinists or toolmakers using appropriate metalworking equipment. Always secure the workpiece properly before cutting operations. When hardening, follow the oil-quench procedure appropriate for AISI O1 tool steel as established by your shop process or the material supplier. Allow the bar to reach a safe handling temperature before further processing.