Starrett 54393 O1 Tool Steel Flat Stock 5/16x3/4x36 in

Product Description

The STARRETT 54393 is an O1 oil-hardening tool steel flat stock bar intended for toolmaking, die making, and precision machining applications. Manufactured to AISI Type O1 specification, this flat stock measures 5/16 inches thick, 3/4 inches wide, and 36 inches long, with a weight of 2.39 pounds per piece. Thickness tolerance is held to plus or minus 0.001 inches, and squareness is maintained at an edge deviation of no more than 0.003 inches per inch. These tight tolerances make it a dependable choice for fabricating punches, dies, gauges, and small tooling components that require consistent stock dimensions before heat treating.

O1 tool steel is widely used in job shops, toolrooms, and maintenance departments across manufacturing environments. This flat bar form is suited for applications where stock is cut to length, profiled, and then hardened in an oil quench process to achieve the desired working hardness. Machinists and tool and die makers working in both production and prototype settings regularly specify O1 flat stock for its predictable heat-treat response and good dimensional stability. The 36-inch length allows for multiple part blanks from a single piece with minimal waste.

Key Features

• AISI Type O1 oil-hardening tool steel for consistent, predictable hardening response
• Thickness held to plus or minus 0.001 inches for reliable fitment in precision tooling setups
• Length tolerance of plus 0.015 inches ensures full usable length on every piece
• Width tolerance of 0.000 to minus 0.005 inches for controlled stock sizing
• Edge squareness deviation no greater than 0.003 inches per inch across all edges
• Single-piece packaging with a minimum order quantity of one for flexible purchasing

Compatibility

Designed as a standard O1 oil-hardening tool steel flat bar suitable for general toolroom and die-making applications requiring AISI Type O1 material specification.

Installation Notes

Machining and finishing of O1 tool steel flat stock should be completed prior to heat treating. Oil quenching and tempering operations should be performed by qualified personnel following established metallurgical procedures for AISI O1 tool steel. Appropriate personal protective equipment and ventilation are required during heat-treat operations. Consult applicable shop safety standards and material data sheets before processing.