Starrett 54372 O1 Tool Steel Flat Stock 1/4x4x36 in

Product Description

The STARRETT 54372 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, jig fabrication, and precision machining applications. It measures 0.25 inches thick, 4 inches wide, and 36 inches long, and weighs 10.2 pounds. Manufactured to AISI Type O1 specification, this flat stock holds a thickness tolerance of plus or minus 0.001 inches, making it suitable for applications that demand tight dimensional accuracy before hardening. O1 tool steel is a widely used oil-hardening grade known for its machinability in the annealed state and its ability to achieve high hardness after heat treatment. Machinists, tool and die makers, and metalworking professionals install and machine this material.

This flat stock is suited for fabricating punches, dies, gauges, tools, and fixtures in both job shop and production environments. The 4-inch width and 36-inch length provide a workable blank for a wide range of toolroom applications. The material arrives in the annealed condition, ready for machining, grinding, and finishing prior to heat treatment. Edge squareness is held to 0.003 inches per inch across all edges, supporting accurate layout and machining setups.

Key Features

• AISI Type O1 oil-hardening tool steel for broad toolroom use
• Thickness tolerance of plus or minus 0.001 inches for dimensional accuracy
• Length tolerance of plus 0.015 inches for consistent blank sizing
• Width tolerance of 0.000 to 0.005 inches under nominal
• Edge squareness held to 0.003 inches per inch on all edges
• Supplied in annealed condition, ready for machining prior to heat treat

Compatibility

Designed as a standard O1 oil-hardening tool steel flat stock blank suitable for general toolroom, die making, and precision fabrication applications where AISI Type O1 material is specified.

Installation Notes

Machining, grinding, and cutting of tool steel flat stock should be performed by qualified machinists or tool and die makers using appropriate metalworking equipment. Always follow shop safety protocols when cutting or grinding tool steel. Heat treatment to harden O1 steel requires controlled furnace equipment and quenching in oil; this process should be performed by personnel with proper metallurgical training and equipment. Handle bar stock carefully to avoid edge damage that could affect tolerance-critical dimensions.