Starrett 54210 O1 Tool Steel Flat Stock 7/8 X 6 X 18 in

Product Description

The STARRETT 54210 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, and precision machining applications. Manufactured to AISI Type O1 specifications, this flat stock measures 7/8 inches thick, 6 inches wide, and 18 inches long, with a finished weight of 26.77 pounds. Tight dimensional tolerances make it suitable for applications where consistent stock removal and predictable hardening response are critical. Licensed machinists, toolmakers, and die shops rely on this material when building punches, dies, gauges, and similar tooling components that require oil-quench heat treatment.

O1 tool steel flat stock is a standard shop material in job shops, tool and die operations, and maintenance machining environments. It machines readily in the annealed state and responds predictably to oil-hardening heat treatment, making it a common choice for low-to-medium production tooling. This bar size is well suited to fabricating larger die sections, wear plates, and blanking tools where a full 6-inch width is needed without sawing down from oversized plate.

Key Features

• AISI Type O1 oil-hardening tool steel — predictable heat-treat response with minimal distortion
• Thickness tolerance of plus or minus 0.001 inches for consistent stock in precision applications
• Width tolerance of 0.000 to 0.005 inches under nominal
• Length tolerance of plus 0.250 inches, minus 0 inches
• Edge squareness held to 0.003 inches per inch across all edges
• Finished weight of 26.77 pounds per piece

Compatibility

Designed as a standard AISI Type O1 oil-hardening tool steel flat bar suitable for toolmaking, die making, and precision machining applications requiring oil-quench heat treatment.

Installation Notes

Machining and heat treatment of tool steel should be performed by qualified machinists or toolmakers familiar with AISI O1 specifications and appropriate shop safety practices. Always use proper personal protective equipment when cutting, grinding, or heat treating tool steel. Follow established heat-treat procedures for O1 material including proper preheat, hardening temperature, and oil-quench technique to minimize distortion and achieve target hardness. Consult applicable shop standards and material data sheets before beginning any hardening operation.