Starrett 54142 O1 Oil-hardening Flat Stock 7/16x2x18

Product Description

The STARRETT 54142 is an O1 oil-hardening flat stock bar made from AISI Type O1 tool steel, supplied in an annealed condition ready for machining, profiling, and heat treating. Measuring 7/16 inches thick by 2 inches wide by 18 inches long and weighing 4.46 pounds, this flat stock is held to tight dimensional tolerances: plus or minus 0.001 inches on thickness, 0.000 to 0.005 inches on width, and plus 0.250 inches on length. Edge squareness is controlled to 0.003 inches per inch across all edges. It is a standard choice for toolmakers, machinists, and die makers who need a reliable, consistent O1 bar for fabricating punches, dies, gauges, and cutting tools.

O1 tool steel flat stock is used in both job shops and production toolrooms where oil-quench heat treatment is required after final machining. The 18-inch length and 2-inch width make this bar well suited for fabricating medium-to-large tool components. It machines readily in the annealed state and responds predictably to oil-quench hardening, making it a go-to material for prototype and production tooling applications across metalworking, mold making, and general tool and die work.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable heat treat response
• Tight thickness tolerance of plus or minus 0.001 inches for close-tolerance tooling work
• Width tolerance held to 0.000 to 0.005 inches under nominal
• Edge squareness controlled to 0.003 inches per inch on all edges
• Supplied in annealed condition for ease of machining prior to hardening
• Single-piece packaging with no minimum order beyond one unit

Compatibility

Designed as a standard O1 oil-hardening tool steel flat bar for general toolroom, die making, and machining applications requiring an oil-quench hardenable material in flat stock form.

Installation Notes

Cutting and machining should be performed in the annealed state using carbide or high-speed steel tooling with appropriate cutting fluids. Heat treatment, including hardening and oil quenching, should be performed by qualified personnel following established procedures for AISI O1 tool steel. Wear appropriate PPE when cutting, grinding, or heat treating this material. Always allow the bar to reach ambient temperature before taking final dimensional measurements.