Starrett 54394 O1 Tool Steel Flat Stock 5/16x1x36 in

Product Description

The STARRETT 54394 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 5/16 inches thick, 1 inch wide, and 36 inches long, and weighs 3.19 pounds. Thickness and squareness tolerances are held to plus or minus 0.001 inches, making this bar suitable for applications that require tight dimensional control before and after heat treatment. Machinists, tool and die makers, and industrial fabricators typically work with this material when dimensional stability and consistent hardening response are required.

This O1 tool steel flat stock is used in job shops, machine shops, and toolrooms for producing punches, dies, gauges, bushings, and custom tooling components. O1 grade is favored for its predictable oil-quench hardening behavior and relatively straightforward machinability in the annealed state. It performs well in applications where moderate wear resistance and good edge retention are needed after hardening. This bar ships in the annealed (soft) condition, ready for machining prior to heat treatment.

Key Features

• AISI Type O1 oil-hardening tool steel — predictable hardening response with oil quench
• Thickness of 5/16 inches with plus or minus 0.001 inches thickness tolerance
• Width of 1 inch with a tolerance of 0.000 to minus 0.005 inches
• Length of 36 inches with a plus 0.015 inches length tolerance
• Squareness held to edge: all 0.003 per inch
• Supplied in annealed condition for pre-heat-treatment machining

Compatibility

Designed as a standard O1 oil-hardening tool steel flat bar suitable for toolmaking, die making, and general precision fabrication applications requiring AISI Type O1 material specification.

Installation Notes

Cutting, grinding, and machining of tool steel should be performed by qualified machinists or tool and die makers using appropriate metal-cutting equipment. All heat treatment operations, including hardening and tempering, should follow established metallurgical procedures for AISI O1 tool steel and should be performed by experienced personnel or a qualified heat treat facility. Proper eye protection, gloves, and machine guarding are required during all cutting and grinding operations. Do not attempt to heat treat this material without verified equipment and process controls.