Starrett 54257 O1 Tool Steel Flat Stock 1/16x1/2x36 in

Product Description

The STARRETT 54257 is an O1 oil-hardening tool steel flat stock bar sized at 1/16 inch thick, 1/2 inch wide, and 36 inches long. Manufactured to AISI Type O1 specifications, this flat stock is designed for toolmakers, machinists, and die makers who need a reliable, tight-tolerance steel blank ready for custom tooling, punches, dies, gauges, and similar precision components. The material ships in an annealed state, allowing it to be machined, ground, and shaped before oil-hardening heat treatment. Thickness tolerance is held to plus or minus 0.001 inch, supporting precision layout and close-fit applications.

O1 tool steel flat stock is a standard material in tool and die shops, maintenance departments, and machine shops. It is used to fabricate custom cutting tools, form dies, wear plates, scraper blades, and fixtures. The 36-inch length is a common mill-length bar suitable for single-piece or multi-piece blanking. This bar is appropriate for both small-shop and production-floor use wherever AISI O1 oil-hardening tool steel is called for by design or specification.

Key Features

• AISI Type O1 oil-hardening tool steel construction for reliable heat-treat response
• Thickness held to plus or minus 0.001 inch for consistent fit in precision assemblies
• Width tolerance of 0.000 to 0.005 inch for controlled stock sizing
• Length tolerance of plus 0.015 inch, minus 0 inch ensures full usable length
• Edge squareness within 0.003 inch per inch for accurate layout and grinding reference
• Single 36-inch bar per package, ordered in individual unit quantities

Compatibility

Designed as a standard AISI Type O1 oil-hardening flat stock blank for use in tool and die fabrication, fixture building, and precision machining applications requiring oil-hardening tool steel.

Installation Notes

O1 tool steel flat stock is worked by machinists and tool and die makers using conventional milling, grinding, and sawing equipment. Material should be machined in the annealed condition before hardening. Oil-hardening heat treatment should follow the material supplier guidelines for AISI O1 and applicable shop procedures. Handle cut edges with care, as burrs and sharp corners are common after sawing or shearing.