Starrett 54077 O1 Tool Steel Flat Stock 0.25x2.5x18 in

Product Description

The STARRETT 54077 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, jig fabrication, and precision machining applications. Cut from AISI Type O1 tool steel, it delivers consistent hardness response and dimensional stability after heat treatment. The bar measures 0.25 inches thick, 2.5 inches wide, and 18 inches long, with a thickness tolerance of plus or minus 0.001 inches. At 3.19 pounds, it is sized for benchtop work without requiring heavy material handling. Machinists, toolmakers, and die makers rely on this grade for its predictable oil-quench hardening behavior and tight as-supplied tolerances.

This flat stock is suited for tool and die shops, maintenance and repair operations, and prototype fabrication environments. It is a standard choice for making punches, dies, gauges, bushings, and similar precision tooling components that require a reliable transition from soft-annealed stock to hardened condition. The 18-inch length accommodates a range of blanking and machining operations without requiring initial resizing on most projects.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable heat-treat response
• Thickness tolerance of plus or minus 0.001 inches for precise blank dimensions
• Width tolerance of 0.0000 to 0.0050 inches
• Length tolerance of plus 0.250 inches, minus 0 inches
• Edge squareness held to 0.003 inches per inch on all edges
• Supplied in annealed condition, ready for machining prior to hardening

Compatibility

Designed as a standard O1 oil-hardening tool steel flat bar suitable for toolmaking, die making, and general precision fabrication applications requiring AISI Type O1 material specification.

Installation Notes

Machining and heat treatment should be performed by qualified toolmakers or machinists familiar with O1 tool steel processing. Secure the workpiece properly before cutting or grinding operations. Follow established oil-quench hardening procedures and applicable shop safety protocols when heat treating. Wear appropriate PPE during all cutting, grinding, and heat-treatment operations.