Starrett 54498 O1 Tool Steel Flat Stock 7/8x4x36 in

Product Description

The STARRETT 54498 is an O1 oil-hardening tool steel flat stock bar measuring 7/8 inch thick, 4 inches wide, and 36 inches long. Made from AISI Type O1 tool steel, this flat stock is supplied in an annealed, pre-hardened form ready for machining, grinding, and heat treatment by tool and die makers, machinists, and metalworking shops. It holds tight dimensional tolerances throughout, with thickness held to plus or minus 0.001 inches, making it well suited for precision tooling applications where dimensional accuracy matters before and after heat treat. At 35.7 pounds per bar, this is a substantial piece intended for industrial and job-shop use.

O1 oil-hardening flat stock is a standard material choice for punches, dies, gauges, jigs, fixtures, blades, and other tooling components that require a through-hardened, wear-resistant finished part. This bar is appropriate for use in general metalworking shops, tool rooms, and die shops producing short-run or prototype tooling. It machines and grinds well in the annealed state, then responds predictably to oil-quench hardening processes. The 36-inch bar length allows multiple blanks to be cut from a single piece, reducing material waste on typical tooling projects.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable heat treatment response
• Thickness tolerance of plus or minus 0.001 inches for precision blank preparation
• Width tolerance of 0.000 to minus 0.005 inches for consistent stock sizing
• Length tolerance of plus 0.015 inches, minus 0 inches
• Edge squareness held to 0.003 inches per inch on all edges
• Full 36-inch bar length supports multiple blanks from a single piece

Compatibility

Designed as a standard O1 oil-hardening tool steel flat stock bar suitable for use in tool and die making, fixture building, and general precision machining applications where AISI Type O1 material specification is required.

Installation Notes

Cutting and machining of tool steel flat stock should be performed by qualified machinists or tool and die makers using appropriate cutting fluids and tooling rated for hardened or semi-hardened steel. Secure the workpiece firmly before any cutting operation. Heat treatment, including oil quenching, should follow established metallurgical procedures and applicable shop safety protocols. Personal protective equipment including eye protection and heat-resistant gloves is required during any heating or quenching operation.