Starrett 54457 O1 Tool Steel Flat Stock 9/16x1x36 in

Product Description

The STARRETT 54457 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, jig fabrication, and precision machining applications. It measures 9/16 inches thick, 1 inch wide, and 36 inches long, with a finished weight of 5.74 pounds. Manufactured to AISI Type O1 material specification, this flat stock ships in an annealed condition ready for machining, then hardens in oil quench to achieve the wear resistance and edge retention required for punches, dies, gauges, and cutting tools. Thickness tolerance is held to plus or minus 0.001 inches, giving machinists a consistent starting dimension with minimal material removal before finish grinding.

O1 tool steel flat stock in this size is commonly used in tool and die shops, maintenance departments, and prototype fabrication environments. The 36-inch bar length allows multiple shorter blanks to be cut from a single piece. Typical applications include die sections, form tools, drill jigs, fixture components, and hand tools requiring high hardness after heat treatment. This stock is worked by machinists and tool and die makers operating surface grinders, milling machines, and EDM equipment.

Key Features

• AISI Type O1 oil-hardening tool steel construction for predictable hardening response and minimal distortion
• Thickness tolerance of plus or minus 0.001 inches for consistent pre-ground dimensions
• Width tolerance of 0.000 to minus 0.005 inches for close-fit applications
• Length tolerance of plus 0.015 inches with no minus allowance
• Edge squareness held to 0.003 inches per inch on all edges
• Single 36-inch bar per package, sold individually

Compatibility

Designed as a standard O1 oil-hardening tool steel flat bar suitable for general toolmaking and die making applications requiring AISI Type O1 material specification.

Installation Notes

Machining and heat treatment of tool steel should be performed by qualified tool and die makers or machinists familiar with O1 oil-hardening procedures. Always anneal or stress-relieve after rough machining before finish grinding. Oil quench heat treatment should follow the steel supplier's recommended procedures for AISI O1, and appropriate PPE must be worn during all heat treatment operations. Cutting and grinding operations generate fine steel particles and heat — use coolant and appropriate respiratory protection as required by shop safety standards.