Starrett 54395 O1 Tool Steel Flat Stock 5/16x1-1/4x36 in

Product Description

The STARRETT 54395 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 5/16 inches thick, 1-1/4 inches wide, and 36 inches long, weighing approximately 3.99 pounds. Thickness tolerance is held to +/- 0.001 inches, making it suitable for applications requiring close dimensional control. Licensed machinists and toolmakers work with this stock to fabricate punches, dies, gauges, jigs, and fixtures that will later be hardened in oil-quench heat treatment processes.

O1 tool steel flat stock is used across job shops, toolrooms, and manufacturing facilities for both prototype and production tooling. The 36-inch length provides a full bar suitable for multiple blanks per piece. The controlled tolerances on thickness and squareness support accurate layout and machining before heat treat. This bar is appropriate for applications where intermediate machinability and good wear resistance after hardening are required, such as cutting tools, forming dies, and precision mechanical components.

Key Features

• AISI Type O1 oil-hardening tool steel material specification
• Thickness held to +/- 0.001 inches for close tolerance fitment
• Width tolerance of 0.000 to -0.005 inches
• Length tolerance of +0.015 inches
• Edge squareness: 0.003 inches per inch on all edges
• Full 36-inch bar length suitable for multiple blank cuts

Compatibility

Designed as a standard O1 oil-hardening tool steel flat bar for general toolroom and machining use where AISI Type O1 material specification is required.

Installation Notes

Cutting and machining of tool steel flat stock should be performed by qualified machinists using appropriate metalworking equipment. Wear appropriate personal protective equipment when sawing or grinding. O1 tool steel requires an oil-quench heat treatment process to achieve hardness — follow established metallurgical procedures for austenitizing temperature, quench media, and tempering cycles. Do not attempt to weld or flame-cut without proper knowledge of preheat and post-heat requirements for tool steel.