Starrett 54332 O1 Tool Steel Flat Stock 5/32x3x36 in

Product Description

The STARRETT 54332 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, and precision machining applications. Manufactured to AISI Type O1 specification, this flat stock measures 5/32 inches thick, 3 inches wide, and 36 inches long and weighs 4.78 pounds. Thickness and squareness tolerances are held to plus or minus 0.001 inches, making this bar suitable for applications where dimensional accuracy before hardening is critical. Licensed machinists, toolmakers, and die makers work with this material to fabricate punches, dies, gauges, and similar tooling components.

O1 tool steel flat stock is used across job shops, tool and die operations, and industrial maintenance departments. Its oil-hardening characteristic means it responds well to standard shop heat-treat processes with minimal distortion compared to water-hardening grades. The 36-inch length and 3-inch width make this bar practical for multiple smaller blanks or a single larger tooling piece. This size is commonly stocked by shops doing small-run die work or precision fixture fabrication.

Key Features

• AISI Type O1 oil-hardening tool steel for consistent hardening response
• Thickness tolerance of plus or minus 0.001 inches for dimensional accuracy
• 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 on all edges
• Ready-to-machine flat bar format — no additional surface prep required before layout

Compatibility

Designed as a general-purpose O1 oil-hardening tool steel flat bar suitable for toolmaking, die making, gauge fabrication, and precision machining applications requiring a pre-hardened or anneal-and-harden workflow.

Installation Notes

Cutting, grinding, and machining of tool steel flat stock should be performed by qualified machinists or toolmakers using appropriate coolant to prevent edge burning. Heat treatment should follow AISI O1 guidelines and be performed in a controlled atmosphere or with appropriate anti-scale compound to maintain surface integrity. Always allow the bar to reach ambient temperature before final dimensioning. Eye and hand protection are required when cutting or grinding tool steel stock.