Starrett 57233 O1 Tool Steel Flat Stock 5/16x1-3/4x18in

Product Description

The STARRETT 57233 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, and precision machining applications. It measures 5/16 inches thick, 1-3/4 inches wide, and 18 inches long, weighing 2.79 pounds. Manufactured to AISI Type O1 material specification, this flat stock holds a thickness tolerance of plus or minus 0.001 inches and a squareness tolerance of 0.003 inches per inch on all edges. It is supplied in a ready-to-machine condition and is intended for use by tool and die makers, machinists, and metalworking professionals who require consistent dimensional accuracy before hardening.

O1 tool steel flat stock of this type is commonly used in the fabrication of punches, dies, gauges, jigs, and cutting tools. Its oil-hardening characteristic makes it well suited for applications requiring good wear resistance and moderate toughness after heat treatment. This bar size is a standard choice for small to medium tooling components in job shops, maintenance facilities, and production toolrooms where precise blanks are machined prior to hardening and finishing.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable heat-treat response
• Thickness tolerance of plus or minus 0.001 inches for dimensional consistency
• Width tolerance of 0.000 to 0.005 inches under nominal
• Length tolerance of plus 0.250 inches from nominal 18 inches
• Squareness held to 0.003 inches per inch on all edges
• Single-piece packaging with no minimum order beyond one piece

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 heat treatment of tool steel should be performed by qualified machinists or tool and die makers familiar with O1 steel properties. Always follow established shop safety practices when cutting, grinding, or milling tool steel, including use of appropriate personal protective equipment. Heat treatment, including oil quenching, should be carried out in accordance with the steel manufacturer's guidelines for AISI O1 and applicable shop procedures. Allow the workpiece to reach ambient temperature before taking final measurements.