Starrett 54422 O1 Tool Steel Flat Stock 3/8x7x36 in

Product Description

The STARRETT 54422 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die-making, and precision machining applications. Manufactured to AISI Type O1 specifications, this flat stock measures 3/8 inch thick, 7 inches wide, and 36 inches long, and weighs approximately 26.77 pounds. Thickness tolerance is held to +/- 0.001 inches, making it suitable for applications where dimensional accuracy is critical before and after heat treatment. It is supplied in the annealed condition and intended to be cut, machined, and then oil-quenched to achieve working hardness. Machinists, tool-and-die makers, and precision fabricators are the primary users of this material.

This flat stock is used in shops producing punches, dies, gauges, forming tools, and other precision tooling components. The O1 grade is a general-purpose oil-hardening tool steel well suited for moderate-run tooling where good wear resistance and dimensional stability during heat treatment are required. At 7 inches wide and 36 inches long, it accommodates larger tooling blanks that would exceed the capacity of narrower bar stock. It is equally applicable in job shops, production toolrooms, and maintenance facilities.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable hardening and good wear resistance
• Thickness held to a tight +/- 0.001 inch tolerance for precision blank preparation
• Width tolerance of 0.000 to -0.005 inches ensures consistent fitment in close-tolerance setups
• Length tolerance of +0.015 inches provides usable overstock for final facing operations
• Edge squareness held to 0.003 inches per inch on all edges
• Supplied in annealed condition for full machinability prior to hardening

Compatibility

Designed as a standard AISI Type O1 oil-hardening tool steel flat bar suitable for general toolmaking, die work, and precision machining applications requiring oil-quench heat treatment.

Installation Notes

Cutting and machining of tool steel flat stock should be performed with appropriate coolant to prevent work hardening and preserve surface finish. Heat treatment to working hardness requires oil quenching per AISI O1 procedures and should be performed by a qualified heat treater or experienced toolroom machinist. Always use appropriate personal protective equipment when cutting, grinding, or heat treating tool steel. Verify final dimensions after heat treatment, as minor distortion is normal with flat stock of this size.