Starrett 54398 O1 Tool Steel Flat Stock 5/16x2-1/2x36 in

Product Description

The STARRETT 54398 is an O1 oil-hardening tool steel flat stock bar, precision-ground to close dimensional tolerances for toolroom and die-making applications. Made from AISI Type O1 tool steel, this flat stock is supplied in the annealed (soft) condition, ready for machining, grinding, and profiling before heat treatment. It measures 5/16 inches thick, 2-1/2 inches wide, and 36 inches long, with a thickness tolerance of plus or minus 0.001 inches. Weighing 7.97 pounds, this bar is a standard choice for machinists, tool and die makers, and maintenance shops that need reliable O1 stock in a ready-to-use length.

O1 tool steel flat stock is used in fabrication of dies, punches, gauges, arbors, guides, and other precision tooling components. It machines cleanly in the annealed state and responds well to oil-quench hardening, making it suitable for applications that require a hard, wear-resistant working surface after heat treatment. This bar is appropriate for both one-off toolroom jobs and short-run production of tool components in a machine shop or maintenance environment.

Key Features

• AISI Type O1 oil-hardening tool steel, supplied in annealed condition for easy machining
• Thickness: 5/16 inches with plus or minus 0.001 inch tolerance
• Width: 2-1/2 inches with tolerance of 0.000 to minus 0.005 inches
• Length: 36 inches with plus 0.015 inch length tolerance
• Edge squareness: all edges held to 0.003 inches per inch
• Weight: 7.97 pounds per bar

Compatibility

Designed as a standard AISI Type O1 oil-hardening tool steel flat stock suitable for general toolroom, die-making, and precision machining applications requiring close-tolerance ground flat bar stock.

Installation Notes

Cutting, grinding, and machining should be performed by a qualified machinist in the annealed condition prior to heat treatment. Follow established shop safety practices when cutting tool steel, including the use of appropriate personal protective equipment and machine guarding. Oil quenching and heat treatment of O1 steel should be performed by qualified personnel following recognized metallurgical procedures. Allow the bar to reach ambient temperature before taking final measurements to ensure dimensional accuracy.