Starrett 54447 O1 Tool Steel Flat Stock 0.5x4x36 in

Product Description

The STARRETT 54447 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, and precision machining applications. Manufactured to AISI Type O1 specifications, this flat stock measures 0.5 inches thick, 4 inches wide, and 36 inches long and weighs 20.4 pounds. The O1 grade offers good machinability in the annealed state and responds well to oil quenching for hardening, making it a go-to material for punches, dies, gauges, and cutting tools. Tight dimensional tolerances are held throughout: thickness tolerance is plus or minus 0.001 inches, length tolerance is plus 0.015 inches, and width tolerance runs from 0 to minus 0.005 inches.

This flat stock is suited for tool and die shops, maintenance machining operations, and precision fabrication environments where consistent stock dimensions reduce setup time. It is appropriate for applications requiring a machinable blank that will be finish-ground and hardened to final size. Typical users include tool and die makers, machinists, and industrial maintenance technicians working in job shop or production environments. The 36-inch length provides a full working bar that can be cut down to individual blanks as required by the job.

Key Features

• AISI Type O1 oil-hardening tool steel — machines well in the annealed state and hardens predictably with an oil quench
• Thickness tolerance of plus or minus 0.001 inches for consistent stock removal during grinding
• Width tolerance from 0 to minus 0.005 inches supports close-tolerance blank preparation
• Edge squareness held to 0.003 inches per inch across all edges
• 36-inch bar length provides multiple blanks from a single piece of stock
• Weighs 20.4 pounds — suitable for heavy-duty tooling blanks

Compatibility

Designed as a standard O1 oil-hardening tool steel flat stock for general toolmaking, die making, and precision machining applications where AISI Type O1 material specification is required.

Installation Notes

Cutting and machining of tool steel flat stock should be performed by qualified machinists using appropriate cutting fluids and tooling rated for tool steel. Always follow established heat-treat procedures and use proper personal protective equipment when hardening and quenching. Material should be stored flat to prevent warpage and kept dry to avoid surface oxidation prior to use.