Starrett 54135 O1 Tool Steel Flat Stock 3/8x12x18 in

Product Description

The STARRETT 54135 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 3/8 inch thick, 12 inches wide, and 18 inches long, and weighs 22.94 pounds. Tight dimensional tolerances make it suitable for applications where dimensional accuracy is critical before and after heat treatment. It is supplied in an annealed condition ready for machining, then oil-quenched during hardening to achieve the desired hardness. Tool and die makers, machinists, and metalworking shops are the primary users of this material.

This flat stock is suited for fabricating punches, dies, gauges, cutting tools, and general toolroom components in both job shop and production environments. The 12-inch width and 18-inch length provide sufficient material for medium to large tooling blanks. O1 tool steel is widely used where good wear resistance and machinability in the annealed state are required, along with predictable oil-hardening response. The piece ships as a single unit and is intended for direct use or further machining to final part dimensions.

Key Features

• AISI Type O1 oil-hardening tool steel — reliable hardening response with minimal distortion during quench
• Thickness tolerance of plus or minus 0.001 inches for precise pre-machined fitment
• Width tolerance of 0.000 to 0.015 inches and length tolerance of plus 0.250 inches
• Squareness: edge all 0.003 per inch for consistent reference surfaces
• 3/8 inch thick by 12 inches wide by 18 inches long — suitable for medium to large tooling blanks
• Single-piece packaging; minimum order quantity of 1

Compatibility

Designed as a general-purpose O1 oil-hardening tool steel flat stock for use in toolroom, die making, and precision machining applications where AISI Type O1 material specification is required.

Installation Notes

Machining and heat treatment of tool steel flat stock should be performed by qualified machinists or tool and die makers using appropriate cutting tools rated for tool steel. All grinding, milling, and drilling operations should be completed in the annealed state prior to hardening. Oil hardening should follow the material manufacturer guidelines for AISI O1, including proper soak temperature and quench procedure. Appropriate personal protective equipment must be worn during all cutting and heat treatment operations.