Drill Rod Tool Steels 66728 O1 Tool Steel Flat Stock

Product Description

The DRILL ROD TOOL STEELS 66728 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die work, jig fabrication, and precision machining applications. Conforming to AISI Type O1 material specification, it measures 3/32 inches thick, 2 inches wide, and 18 inches long, with tightly controlled tolerances: thickness held to plus or minus 0.001 inches, width to plus 0.005 minus 0.000 inches, and length to plus 0.25 inches. Machinists, toolmakers, and metalworking professionals use this flat stock as raw material for punches, dies, gauges, and cutting tools that require a clean oil-quench hardening response.

This flat stock suits job shops, tool and die operations, and maintenance departments that work with oil-hardening grades for short-run tooling and precision fixtures. The 18-inch length provides a practical working blank for most bench and mill operations. Squareness is controlled to 0.003 inches on edges and 0.004 inches per inch of thickness on ends, supporting accurate setups without excessive pre-machining. Supplied in the annealed condition, the material is ready for machining prior to heat treat.

Key Features

• AISI Type O1 oil-hardening tool steel for reliable, controlled hardening response in oil quench
• Thickness tolerance of plus or minus 0.001 inches for precision stock removal planning
• Width tolerance of plus 0.005 minus 0.000 inches and length tolerance of plus 0.25 inches
• Edge squareness held to 0.003 inches; end squareness 0.004 inches per inch of thickness
• Annealed flat stock ready for machining, profiling, and subsequent heat treatment
• Individual piece packaging with a minimum order quantity of 1

Compatibility

Designed as a general-purpose O1 oil-hardening tool steel flat stock suitable for toolmaking, die making, gauge fabrication, and similar precision metalworking applications requiring AISI Type O1 material.

Installation Notes

Machining and heat treatment of tool steel flat stock should be performed by qualified toolmakers or machinists familiar with O1 oil-hardening grades. Always machine in the annealed condition before hardening. Oil quenching and tempering should follow established metallurgical procedures for AISI O1 to achieve target hardness without cracking. Handle flat stock with care to avoid nicks or burrs on precision-ground surfaces that could affect tolerance compliance.