Starrett 54430 O1 Tool Steel Flat Stock 7/16x1-1/4x36in

Product Description

The STARRETT 54430 is an O1 oil-hardening tool steel flat stock bar intended for toolmakers, machinists, and die makers who require a precision-ground blank ready for layout, machining, and heat treatment. The bar measures 7/16 inch thick, 1-1/4 inches wide, and 36 inches long, with a thickness tolerance of plus or minus 0.001 inches and a length tolerance of plus 0.015 inches. Width tolerance is held to 0.000 to 0.005 inches on the minus side. AISI Type O1 tool steel is widely used for punches, dies, gauges, and cutting tools because it hardens well in an oil quench and offers good dimensional stability after heat treatment.

This flat stock is suited for job shops, toolrooms, and maintenance departments working in industrial and manufacturing environments. It is commonly used to fabricate precision components where a machinable, heat-treatable steel is needed before final hardening and grinding. The 36-inch length allows multiple blanks to be cut from a single piece, reducing material waste on short-run tooling projects. Machinists and tool and die makers are the primary installers and fabricators of this material.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable heat-treat response
• Thickness tolerance of plus or minus 0.001 inches for precision layout work
• Width tolerance of 0.000 to 0.005 inches under nominal
• Length tolerance of plus 0.015 inches
• Edge squareness held to 0.003 inches per inch on all edges
• 36-inch length supports multiple blank cuts from a single bar

Compatibility

Designed as a general-purpose O1 oil-hardening tool steel flat bar suitable for fabrication of punches, dies, gauges, jigs, and other precision toolroom components requiring oil-quench heat treatment.

Installation Notes

Cutting, grinding, and machining of tool steel flat stock should be performed by qualified machinists or tool and die makers using appropriate coolant to prevent work hardening at the cut edge. Heat treatment, including oil quenching and tempering, should follow recognized metallurgical procedures for AISI O1 tool steel and be performed by personnel familiar with tool steel handling. Always wear appropriate PPE when cutting or grinding steel bar stock. Deburr all cut edges before handling or storing remaining material.