Starrett 54419 O1 Tool Steel Flat Stock 3/8x5x36 in

Product Description

The STARRETT 54419 is an O1 oil-hardening tool steel flat stock bar measuring 3/8 inch thick, 5 inches wide, and 36 inches long, weighing 19.12 pounds. Manufactured to AISI Type O1 specifications, this flat stock is ground and toleranced for precision toolmaking applications. Thickness tolerance is held to plus or minus 0.001 inches, ensuring consistent stock removal and predictable heat-treat response. Machinists, tool and die makers, and metalworking shops use this material as a starting point for punches, dies, gauges, fixtures, and cutting tools that require a clean oil-quench hardening process.

O1 tool steel flat stock of this size is suited to job shops, production toolrooms, and maintenance departments that fabricate or repair tooling in-house. The 36-inch length provides sufficient stock for multiple blanks per bar on most common tooling profiles. Edge squareness is held to 0.003 inches per inch on all edges, supporting layout and machining setups that depend on a reliable reference surface. This bar is sold as a single piece with a minimum order quantity of one.

Key Features

• AISI Type O1 oil-hardening tool steel construction for predictable hardening response
• Thickness tolerance: plus or minus 0.001 inches for precise fit in tooling applications
• Width tolerance: 0.000 to minus 0.005 inches
• Length tolerance: plus 0.015 inches, minus 0 inches
• Edge squareness held to 0.003 inches per inch on all edges
• Single-piece packaging with no minimum order beyond one bar

Compatibility

Designed as a general-purpose O1 oil-hardening tool steel flat bar suitable for fabricating punches, dies, gauges, fixtures, and other tooling requiring oil-quench heat treatment.

Installation Notes

Cutting and machining of tool steel flat stock should be performed by qualified machinists using appropriate metalworking equipment and personal protective equipment including eye protection and gloves. Always de-burr cut edges before handling or further machining. Heat treatment of O1 tool steel requires controlled atmosphere or salt-bath furnace equipment and should be performed by personnel familiar with oil-quench hardening procedures. Follow applicable shop safety standards and equipment manufacturer guidelines when cutting or heat-treating this material.