Starrett 56964 O1 Tool Steel Flat Stock 3/16x2-1/2x18in

Product Description

The STARRETT 56964 is a precision-ground O1 oil-hardening tool steel flat stock bar intended for toolmakers, machinists, and die makers working in job shops, maintenance facilities, and production environments. The bar measures 3/16 inches thick, 2-1/2 inches wide, and 18 inches long, with a thickness tolerance of +0.0100 to 0.0150 inches and a width tolerance of +0.0100 to 0.0150 inches. O1 tool steel offers good wear resistance and maintains dimensional stability through the oil-hardening heat treatment process, making it a reliable choice for punches, dies, gauges, and similar tooling components.

This flat stock is suited for fabricating custom tooling in both light industrial and precision machining environments. The 18-inch length and 2-1/2-inch width offer enough material for common blank layouts without excessive waste. The tight squareness tolerance of 0.003 inches per inch across all edges makes it appropriate for applications requiring accurate reference surfaces. Machinists and tool-and-die professionals typically use this bar stock as raw material that will be machined, ground, and then oil-hardened to final hardness before being placed into service.

Key Features

• AISI Type O1 oil-hardening tool steel for reliable heat-treat response
• Thickness: 3/16 inches with +0.0100 to 0.0150 inch tolerance
• Width: 2-1/2 inches with +0.0100 to 0.0150 inch tolerance
• Length: 18 inches with +0.2500 inch tolerance
• Edge squareness held to 0.003 inches per inch on all edges
• Ready for machining, grinding, and subsequent oil-hardening operations

Compatibility

Designed as a standard O1 tool steel flat bar for use in general toolmaking, die making, and precision machining applications requiring an oil-hardening material specification.

Installation Notes

O1 tool steel flat stock is worked by qualified machinists and tool-and-die makers using standard metalworking equipment including mills, grinders, and EDM machines. Before oil-hardening heat treatment, verify final dimensions are within print tolerance since post-hardening grinding allowances should be factored into the pre-heat-treat dimensions. Follow the steel supplier and AISI guidelines for proper preheat, austenitizing temperature, and quench procedure specific to O1 tool steel. Handle precision-ground surfaces carefully to avoid nicks or burrs that could affect layout or finished part accuracy.