Starrett 58901 O1 Tool Steel Flat Stock 1/32x2x36 in

Product Description

The STARRETT 58901 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die work, and precision machining applications. Manufactured from AISI Type O1 tool steel, this flat stock measures 1/32 inch thick, 2 inches wide, and 36 inches long, with a weight of 0.64 pounds. Thickness tolerance is held to plus or minus 0.001 inches, supporting accurate stock removal and ground-finish work. The edge squareness is controlled to 0.003 inches per inch on all edges. Machinists, tool and die makers, and metalworking shops rely on O1 flat stock as a versatile, oil-quench-hardenable material that machines cleanly in the annealed condition and responds predictably to heat treatment.

This flat stock is suited for fabricating punches, dies, gauges, jigs, fixtures, blades, and other tooling components where dimensional consistency in the pre-hardened blank is critical. The 36-inch length allows multiple parts to be laid out and cut from a single bar, reducing material waste on short-run tooling projects. Industrial maintenance shops and production machine shops both use O1 flat stock as a go-to material for small tooling that requires moderate wear resistance after oil quenching and tempering.

Key Features

• AISI Type O1 oil-hardening tool steel construction for predictable heat-treat response
• Thickness: 1/32 inch with tolerance of plus or minus 0.001 inches
• Width: 2 inches with tolerance of 0.000 to minus 0.005 inches
• Length: 36 inches with tolerance of plus 0.015 inches
• Edge squareness held to 0.003 inches per inch on all edges
• Supplied in annealed condition, ready for machining prior to hardening

Compatibility

Designed as a standard AISI Type O1 oil-hardening tool steel flat stock suitable for general toolmaking, die making, and precision fixture fabrication where oil-quench-hardenable steel in flat bar form is required.

Installation Notes

Cutting, grinding, and machining should be performed in the annealed condition before any heat treatment. Hardening and tempering of O1 tool steel involves specific austenitizing temperatures and oil-quench procedures that must be performed by or under the direction of a qualified machinist or heat-treat professional following established metallurgical guidelines. Use appropriate personal protective equipment when cutting or grinding tool steel. Secure the workpiece firmly before machining to prevent movement and maintain dimensional tolerances.