Starrett 54438 O1 Tool Steel Flat Stock 0.5x0.625x36 in

Product Description

The STARRETT 54438 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die work, jig fabrication, and precision machining applications. Manufactured to AISI Type O1 specification, this flat stock measures 0.5 inches thick, 0.625 inches wide, and 36 inches long, with a weight of 3.19 pounds. Thickness tolerance is held to plus or minus 0.001 inches, making it suitable for applications that require close dimensional control before and after heat treatment. This material is sold as individual stock before any hardening operation and must be oil-quenched by the end user to achieve working hardness.

O1 tool steel flat stock is a standard choice for machinists, toolmakers, and metalworking shops producing punches, dies, blades, gauges, and similar tooling components. The annealed condition of this stock allows for machining, grinding, and shaping prior to heat treatment. It is commonly used in both job shops and production environments where a repeatable, readily available oil-hardening grade is required. The 36-inch length accommodates a range of part blanks and reduces the need for joining shorter pieces.

Key Features

• AISI Type O1 oil-hardening tool steel — standard grade for punches, dies, and precision tooling blanks
• Thickness tolerance of plus or minus 0.001 inches for consistent stock removal and fit-up
• Width tolerance of 0.000 to minus 0.005 inches, length tolerance of plus 0.015 inches
• Edge squareness held to 0.003 inches per inch across all edges
• 36-inch length provides flexibility for cutting multiple blanks from a single bar
• Supplied in annealed condition, ready for machining prior to oil-quench hardening

Compatibility

Designed as a general-purpose O1 oil-hardening tool steel flat stock suitable for toolmaking, die making, and precision machining applications requiring close dimensional tolerances.

Installation Notes

This material is worked by qualified machinists and toolmakers using conventional metalworking equipment. All machining, grinding, and finishing operations should be completed before heat treatment. Follow established AISI O1 heat treatment procedures for hardening and tempering — consult the material specification sheet for proper austenitizing and quench parameters. Handle annealed stock carefully to avoid surface damage that could affect finished part tolerances.