Starrett 54078 O1 Tool Steel Flat Stock 1/4x3x18 in

Product Description

The STARRETT 54078 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, jig fabrication, and precision machining applications. It measures 0.25 inches thick, 3 inches wide, and 18 inches long, and is manufactured from AISI Type O1 oil-hardening tool steel to tight dimensional tolerances. The thickness tolerance is plus or minus 0.001 inches, making this stock suitable for applications where dimensional consistency is critical before hardening. Machinists, toolmakers, and die makers work with this stock in its annealed state, then oil-quench harden it to achieve the final hardness required for cutting tools, gauges, and fixtures.

This flat stock is suited for job shops, tool and die operations, and precision manufacturing environments requiring reliable, pre-sized O1 tool steel. Common applications include the fabrication of punches, dies, forming tools, blanking tools, and machine components that require moderate wear resistance and good machinability prior to heat treatment. The 18-inch length provides usable stock for multiple smaller blanks or a single longer component without excess material waste.

Key Features

• AISI Type O1 oil-hardening tool steel construction for predictable heat treat response
• Thickness tolerance of plus or minus 0.001 inches for close-tolerance work
• Width tolerance of 0.000 to 0.005 inches under nominal
• Length tolerance of plus 0.250 inches, minus 0
• 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 standard O1 oil-hardening tool steel flat stock for general toolmaking, die making, and precision machining applications requiring pre-sized bar stock in annealed condition.

Installation Notes

O1 tool steel flat stock is worked by qualified machinists and toolmakers using conventional milling, drilling, grinding, and sawing equipment. Secure workpieces properly before any cutting operation. Heat treatment, including hardening and tempering, should follow established metallurgical procedures appropriate for AISI O1 tool steel and be performed by qualified personnel. Always use appropriate personal protective equipment when machining or heat treating tool steel.