Starrett 54396 O1 Tool Steel Flat Stock 5/16x1-1/2x36in

Product Description

The STARRETT 54396 is an O1 oil-hardening tool steel flat stock bar measuring 5/16 inch thick, 1-1/2 inches wide, and 36 inches long. Manufactured to AISI Type O1 specification, this flat stock is used by machinists, toolmakers, and die makers as raw material for cutting tools, punches, dies, and precision fixtures. O1 tool steel offers excellent machinability in its annealed state and responds predictably to oil-hardening heat treatment. Tight dimensional tolerances — plus or minus 0.001 inch on thickness — make this stock suitable for applications where precise pre-hardened dimensions are critical to final part geometry.

This flat stock is appropriate for job shops, tool and die operations, and maintenance machining environments where O1 tool steel is the specified material. Typical uses include blanks for hand tools, gauges, jigs, and small die components. The 36-inch length provides a standard working blank that can be cut to size on a horizontal band saw or surface grinder before heat treatment. Both light production and one-off prototype applications are common use cases for this bar stock format.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable heat treatment response
• Thickness tolerance of plus or minus 0.001 inch for precise pre-machining fitment
• Width tolerance of 0.000 to minus 0.005 inch ensures stock is never over-width
• Length tolerance of plus 0.015 inch provides clean usable length without undercut
• Edge squareness held to 0.003 inch per inch for consistent reference surfaces
• 36-inch length is a standard flat stock size compatible with common band saw and grinder setups

Compatibility

Designed as a standard O1 tool steel flat stock blank suitable for use in tool and die, maintenance machining, and general metalworking applications requiring AISI Type O1 oil-hardening material.

Installation Notes

Cutting and machining of tool steel flat stock should be performed by qualified machinists or toolmakers using appropriate metalworking equipment. Material is supplied in the annealed condition and should be hardened and tempered by a qualified heat treater following established procedures for AISI O1 tool steel. Always wear appropriate PPE when cutting, grinding, or handling tool steel bar stock. Follow applicable shop safety standards and equipment manufacturer guidelines during all machining operations.