Starrett 54379 O1 Tool Steel Flat Stock 1/4x10x36 in

Product Description

The STARRETT 54379 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, jig fabrication, and precision machining applications. Manufactured to AISI Type O1 material specification, this flat stock measures 0.25 inches thick, 10 inches wide, and 36 inches long, and weighs approximately 25.5 pounds. The tight thickness tolerance of plus or minus 0.001 inches makes this stock well-suited for applications where dimensional accuracy is critical before and after heat treatment. Licensed machinists, toolmakers, and die shops are the primary users of this material.

This flat stock is used in fabrication shops and tool rooms for producing punches, dies, gauges, and cutting tools. The O1 grade is a general-purpose oil-hardening tool steel valued for its machinability in the annealed state and its ability to hold a sharp edge after hardening. The 36-inch length provides a useful starting blank for common toolroom layouts, and the 10-inch width accommodates wide die plates and fixture components.

Key Features

• AISI Type O1 oil-hardening tool steel for reliable heat treat response
• Thickness: 0.25 inches with plus or minus 0.001 inches tolerance
• Width: 10 inches with tolerance of minus 0 to minus 0.015 inches
• Length: 36 inches with plus 0.015 inches tolerance
• Edge squareness held to 0.003 inches per inch on all edges
• 25.5-pound bar weight suitable for large die and fixture blanks

Compatibility

Designed as a standard O1 tool steel flat stock blank for use in toolroom, die making, and precision fabrication applications requiring oil-hardening material per AISI Type O1 specification.

Installation Notes

Cutting, grinding, and machining of tool steel flat stock should be performed by qualified machinists or toolmakers using appropriate metalworking equipment. Material should be handled in the annealed condition prior to heat treatment. Heat treating to final hardness requires controlled atmosphere or salt bath equipment and should follow established shop procedures for O1 tool steel. Always use appropriate personal protective equipment when cutting or grinding tool steel.