Starrett 54299 O1 Oil-hardening Flat Stock Tool Steel

Product Description

The STARRETT 54299 is an O1 oil-hardening flat stock bar made from AISI Type O1 tool steel. It measures 0.125 inches thick, 0.625 inches wide, and 36 inches long, with a thickness tolerance of plus or minus 0.001 inches, a length tolerance of plus 0.015 inches, and a width tolerance of 0.000 to 0.005 inches. Squareness is held to 0.003 inches per inch on all edges. This stock is used by machinists, toolmakers, and die makers who need a precision-ground, oil-hardening material ready for heat treatment and finishing to close tolerances.

O1 tool steel flat stock in this size is well suited for fabricating punches, dies, gauges, cutting tools, and other precision toolroom components. The 36-inch length provides adequate material for a range of shop applications without excessive waste. Its oil-hardening designation means it reaches full hardness with a relatively mild quench compared to water-hardening grades, reducing the risk of distortion in thin sections like this 0.125-inch profile. Toolroom professionals and job shops working to tight dimensional requirements are the primary users of this stock.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable heat treatment response
• Thickness: 0.125 inches with tolerance of plus or minus 0.001 inches
• Width: 0.625 inches with tolerance of 0.000 to 0.005 inches
• Length: 36 inches with tolerance of plus 0.015 inches
• Squareness held to 0.003 inches per inch on all edges
• Sold as a single piece (package quantity of 1)

Compatibility

Designed as a standard O1 oil-hardening flat stock suitable for general toolroom, die-making, and precision fabrication applications requiring AISI Type O1 tool steel in a 0.125-inch by 0.625-inch bar profile.

Installation Notes

Cutting and machining of tool steel flat stock should be performed with appropriate metalworking equipment; standard woodworking or sheet-metal tools are not suitable. Heat treatment should follow established O1 oil-quench procedures and be performed by qualified personnel with proper equipment and safety controls. Allow stock to cool fully and verify dimensions before finish grinding to final tolerances. Wear appropriate PPE when cutting, grinding, or heat treating tool steel.