Starrett 54463 O1 Tool Steel Flat Stock 5/8x1x36 in

Product Description

The STARRETT 54463 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, jig and fixture fabrication, and precision machining applications. It measures 5/8 inch thick, 1 inch wide, and 36 inches long, and weighs 6.37 pounds. Manufactured to AISI Type O1 oil-hardening material specification, this flat stock holds tight dimensional tolerances, including a thickness tolerance of plus or minus 0.001 inches and a length tolerance of plus 0.015 inches. It is a go-to raw material for shops and trade professionals who need a consistent, machinable tool steel bar ready for custom tooling work.

This flat stock is suited for machine shops, tool and die shops, and metalworking operations that require a reliable O1 tool steel blank. Typical applications include cutting tools, punches, dies, gauges, and similar precision components that will be machined to final dimensions and then heat treated. The 36-inch length provides adequate stock for multiple parts or a single long component. Each bar is supplied individually, with a minimum order quantity of one piece.

Key Features

• AISI Type O1 oil-hardening tool steel — consistent machinability and predictable heat treat response
• Thickness tolerance of plus or minus 0.001 inches for precise stock allowance planning
• Width tolerance of 0.000 to minus 0.005 inches for controlled fit in tooling setups
• Length tolerance of plus 0.015 inches — nominal 36 inches with slight overrun for clean facing
• Edge squareness held to 0.003 inches per inch across all edges
• Ready-to-machine flat bar — no additional surface grinding required for most tooling blanks

Compatibility

Designed as a standard O1 oil-hardening tool steel flat stock blank compatible with conventional machining, grinding, and heat treating processes used in tool and die, mold making, and general precision metalworking applications.

Installation Notes

Cutting and machining of tool steel flat stock should be performed by qualified machinists using appropriate carbide or high-speed steel tooling. Secure the workpiece firmly in a milling vise or lathe chuck before machining to prevent movement. Heat treating to final hardness should follow established AISI O1 oil-quench procedures and is typically performed by a qualified heat treating shop or experienced toolmaker. Always wear appropriate PPE when cutting, grinding, or handling tool steel bar stock.