Starrett 54531 O1 Tool Steel Flat Stock 1-1/2x2-1/2x36 in

Product Description

The STARRETT 54531 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, jig fabrication, and precision machining applications. Manufactured to AISI Type O1 specification, this flat stock measures 1-1/2 inches thick by 2-1/2 inches wide by 36 inches long and weighs 38.25 pounds. The O1 grade offers good machinability in the annealed state and responds well to oil-hardening heat treatment, making it a standard choice for punches, dies, gauges, and cutting tools. Machinists, toolmakers, and die shop professionals are the primary users of this stock.

This flat stock is suited for tool and die shops, maintenance machining departments, and precision fabrication operations requiring a reliable oil-hardening steel in a large flat bar format. The 36-inch length and 1-1/2 by 2-1/2 inch cross-section make it appropriate for blanking larger die components, machine components, and wear parts that will be finish-machined and heat treated to final hardness on site.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable heat treatment response
• Thickness tolerance of plus or minus 0.001 inches for close-tolerance machining
• Length tolerance of plus 0.015 inches, minus 0 inches
• Width tolerance of 0.000 to minus 0.005 inches
• Edge squareness held to 0.003 inches per inch on all edges
• 38.25-pound bar weight suitable for substantial die block and tooling blank applications

Compatibility

Designed as a standard AISI O1 oil-hardening tool steel flat stock suitable for use in tool and die, jig, fixture, and precision machining applications where oil-hardening grades are specified.

Installation Notes

Cutting and machining of tool steel flat stock should be performed by qualified machinists or toolmakers using appropriate metal-cutting equipment. Always use proper workholding and cutting fluid when sawing or milling O1 steel to maintain dimensional accuracy and surface integrity. Heat treatment including hardening and tempering should follow established metallurgical procedures for AISI O1 and should be performed in a controlled atmosphere or with appropriate anti-decarburization precautions. Handle large flat stock bars carefully due to significant weight — 38.25 pounds — to prevent injury and surface damage.