Starrett 59157 O1 Tool Steel Flat Stock 3/16x3/16x36 in

Product Description

The STARRETT 59157 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, and precision machining applications. Manufactured to AISI Type O1 material specification, this flat stock measures 3/16 inches thick by 3/16 inches wide by 36 inches long and holds a thickness tolerance of plus or minus 0.001 inches. O1 tool steel is a general-purpose oil-hardening grade known for its dimensional stability after heat treatment, making it a standard choice for punches, dies, gauges, and custom tooling. The bar ships in a single piece at 0.36 pounds and is suitable for shop cutting to length.

This flat stock is used in machine shops, tool-and-die operations, and maintenance departments where precision steel bar stock must be machined or ground to final form before hardening. The 36-inch length provides enough material for multiple short blanks. Typical users include tool and die makers, machinists, and maintenance technicians who require consistent raw stock with tight dimensional tolerances. The square cross-section profile suits applications where uniform wall thickness on all four sides is required prior to grinding or EDM work.

Key Features

• AISI Type O1 oil-hardening tool steel material specification
• Thickness tolerance of plus or minus 0.001 inches for close-tolerance tooling blanks
• Width tolerance of 0.000 to minus 0.005 inches
• Length tolerance of plus 0.015 inches
• Edge squareness: all edges 0.003 inches per inch maximum
• Square cross-section profile — 3/16 inches by 3/16 inches — for uniform stock removal on all sides

Compatibility

Designed as a standard O1 oil-hardening flat stock bar for use in general tool and die, punch, gauge, and precision machining applications requiring AISI Type O1 material.

Installation Notes

This is raw tool steel bar stock intended for machining, grinding, or sawing prior to heat treatment. Use appropriate metal-cutting equipment and personal protective equipment when cutting or grinding. O1 steel should be hardened and tempered by a qualified heat treater following established procedures for oil-quench tool steels. Handle cut edges carefully, as burrs from sawing or shearing can be sharp.