Starrett 59148 O1 Tool Steel Flat Stock 1/32 X 4 X 36 in

Product Description

The STARRETT 59148 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die work, jig fabrication, and precision machining applications. Manufactured to AISI Type O1 specification, this flat stock measures 1/32 inch thick, 4 inches wide, and 36 inches long. Thickness tolerance is held to plus or minus 0.001 inches, making it suitable for applications where dimensional accuracy is critical before heat treatment. At 1.28 pounds, the bar is easy to handle for bench work. Machinists, toolmakers, and die makers rely on O1 stock for its consistent pre-hardened machinability and predictable oil-quench response.

This flat stock is suited for fabricating punches, dies, gauges, cutting tools, and fixture components in both job shop and production toolroom environments. The 36-inch length provides enough material for multiple blanks from a single piece, reducing waste on typical toolroom cuts. The 4-inch width accommodates medium-sized die plates and gauge blanks without requiring additional material joining. It is appropriate for use where a final hardening and tempering operation will follow rough machining.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable heat treat response
• Thickness tolerance of plus or minus 0.001 inches for close-tolerance toolroom work
• Length tolerance of plus 0.015 inches, zero minus for consistent blank cutting
• Width tolerance of 0.000 to minus 0.005 inches
• Edge squareness held to 0.003 inches per inch on all edges
• 36-inch length yields multiple blanks from a single bar

Compatibility

Designed as a standard AISI O1 oil-hardening tool steel flat stock suitable for general toolroom, die-making, and precision machining applications where oil-quench heat treatment is required.

Installation Notes

Cutting, grinding, and machining of tool steel flat stock should be performed by qualified toolmakers or machinists using appropriate cutting fluids and tooling rated for tool steel. Secure the workpiece firmly before any sawing or milling operation. Heat treatment, including hardening and tempering, should follow established metallurgical procedures for AISI O1 tool steel and be performed by personnel familiar with proper quench media handling and furnace controls. Allow the material to reach a uniform temperature throughout cross-section before quenching to avoid distortion or cracking.