Starrett 54461 O1 Tool Steel Flat Stock 5/8 X 5/8 X 36 in

Product Description

The STARRETT 54461 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, punch and fixture fabrication, and general precision machining applications. Manufactured to AISI Type O1 specifications, this flat stock measures 5/8 inches thick by 5/8 inches wide by 36 inches long and weighs 3.98 pounds. Thickness tolerance is held to plus or minus 0.001 inches, making it suitable for applications where dimensional consistency is critical before and after heat treatment. Machinists, tool and die makers, and metalworking shops typically work with this material at the bench or on manual and CNC machine tools prior to oil-quench hardening.

This flat stock is suited to low-distortion oil-hardening applications in tool and die shops, maintenance machining environments, and prototype fabrication settings. The 36-inch length provides a practical stock size for cutting multiple blanks from a single bar. O1 tool steel is a widely used grade for punches, dies, gauges, and small cutting tools where good hardness and moderate toughness are required. This part ships as a single bar with a minimum order quantity of one piece.

Key Features

• AISI Type O1 oil-hardening tool steel for good hardness after quench
• Thickness held to plus or minus 0.001 inches for consistent pre-hardened dimensions
• Width tolerance of 0.000 to minus 0.005 inches for close-fit stock applications
• Length tolerance of plus 0.015 inches, minus 0 inches
• Edge squareness held to 0.003 inches per inch on all edges
• 36-inch bar length suitable for cutting multiple blanks

Compatibility

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

Installation Notes

O1 tool steel flat stock is worked by qualified machinists or tool and die makers using standard metal-cutting equipment. All machining, grinding, and fitting operations should be completed before oil-quench hardening, as the steel will reach high hardness and become difficult to machine afterward. Follow applicable shop safety procedures when cutting, grinding, or heat-treating tool steel, including appropriate PPE for hot quench operations. Consult AISI O1 heat-treatment specifications for proper austenitizing and quench procedures.