Starrett 56995 O1 Tool Steel Flat Stock 5/16x3x18 in

Product Description

The STARRETT 56995 is a precision-ground O1 oil-hardening tool steel flat stock bar used in toolmaking, jig building, die making, and general machining applications. Manufactured to AISI Type O1 specifications, this flat stock measures 5/16 inches thick, 3 inches wide, and 18 inches long. Thickness and width tolerances are held to +0.0100 to 0.0150 inches, and length tolerance is +0.2500 inches. Edge squareness is maintained at 0.003 per inch across all edges. Licensed machinists and toolmakers rely on O1 flat stock as a versatile, readily available tool steel that responds well to oil-quench hardening and finish grinding.

O1 tool steel flat stock is used in the fabrication of punches, dies, gauges, cutting tools, and fixtures in both job shop and production environments. The 5/16-inch thickness suits thin-profile tooling components where moderate cross-section and tight dimensional control are required. This bar is supplied in the annealed condition, ready for machining before heat treatment. Typical users include tool and die makers, machinists, and industrial maintenance technicians working in metal fabrication, manufacturing, and precision machining shops.

Key Features

• AISI Type O1 oil-hardening tool steel — responds predictably to oil-quench hardening
• Precision ground to +0.0100 to 0.0150 inch thickness and width tolerance
• Edge squareness held to 0.003 per inch on all edges
• Supplied in annealed condition — ready for machining prior to heat treat
• Length tolerance of +0.2500 inches allows for saw-cut allowance
• Weighs 4.78 pounds per piece at 18-inch length

Compatibility

Designed as a standard AISI O1 oil-hardening tool steel flat bar suitable for general toolmaking, die making, and fixture fabrication applications where precision ground flat stock in annealed condition is required.

Installation Notes

O1 flat stock is machined in the annealed state using standard toolroom practices before hardening and tempering. Heat treatment should be performed by qualified personnel following AISI O1 guidelines for oil quenching and tempering temperatures to achieve the desired hardness. Grinding after heat treatment is standard practice to achieve final dimensional tolerances. Always use appropriate personal protective equipment when cutting, grinding, or heat treating tool steel.