Starrett 54159 O1 Tool Steel Flat Stock 0.5x5x18 in

Product Description

The STARRETT 54159 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, and precision machining applications. Manufactured to AISI Type O1 specification, this flat stock measures 0.5 inches thick, 5 inches wide, and 18 inches long, and weighs 12.75 pounds. Thickness tolerance is held to plus or minus 0.001 inches, making it suitable for applications where dimensional accuracy is critical before and after heat treatment. Licensed machinists and tool and die makers rely on O1 stock for its consistent hardening response and machinability in the annealed state.

O1 tool steel flat stock is used in the fabrication of cutting tools, punches, dies, gauges, and fixtures in job shops, tool rooms, and manufacturing facilities. This particular size, at 0.5 inches thick and 5 inches wide, supports medium-scale die and tooling work where a substantial cross-section is required. The 18-inch length provides practical working stock for layout and machining before final profiling and heat treatment. This material is supplied in the annealed condition and is intended for subsequent oil-quench hardening by a qualified heat treater or machinist.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable, consistent heat treatment response
• Thickness tolerance of plus or minus 0.001 inches for precision fitment
• Width tolerance of 0.000 to minus 0.005 inches for close-tolerance stock removal
• Length tolerance of plus 0.250 inches, minus 0 inches
• Edge squareness held to 0.003 inches per inch across all edges
• Supplied in annealed condition, ready for machining prior to hardening

Compatibility

Designed as a general-purpose O1 oil-hardening tool steel flat bar suitable for tool room, die shop, and precision machining applications requiring AISI Type O1 material specification.

Installation Notes

Machining of O1 tool steel flat stock should be performed in the annealed condition using appropriate cutting fluids and carbide or high-speed steel tooling. Oil-quench hardening must be performed by a qualified technician following established heat treatment procedures for AISI O1 material. Always allow stock to reach ambient temperature before final dimensioning. Consult applicable shop safety standards when handling and heat-treating tool steel.