Starrett 54221 O1 Tool Steel Flat Stock 1x6x18 Inch

Product Description

The STARRETT 54221 is an O1 oil-hardening tool steel flat stock bar measuring 1 inch thick, 6 inches wide, and 18 inches long. O1 is an AISI-classified oil-hardening tool steel valued for its consistent dimensional tolerances and machinability in the annealed state. This flat stock is used by machinists, toolmakers, and die makers who need a reliable, ready-to-machine blank for cutting tools, punches, dies, gauges, and other precision tooling applications. Thickness tolerance is held to plus or minus 0.001 inches, and squareness is maintained to within 0.003 inches per inch on all edges, making this stock suitable for close-tolerance work without additional surface grinding in many applications.

This flat stock is suited for job shops, tool rooms, and production environments where custom tooling is fabricated in-house. It is commonly used in the manufacture of blanking dies, forming dies, cutting blades, and similar hardened-tool components. The O1 grade machines well in the soft-annealed condition and responds predictably to oil-quench hardening, making it a standard choice for general-purpose tool steel applications in both small-batch and one-off tooling projects. This piece ships as a single bar at 30.6 pounds.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable heat-treat response
• Thickness tolerance of plus or minus 0.001 inches for close-tolerance blanks
• Width tolerance of 0.000 to minus 0.005 inches
• Length tolerance of plus 0.250 inches, minus 0 inches
• Edge squareness held to 0.003 inches per inch on all edges
• Supplied in annealed condition, ready for machining prior to hardening

Compatibility

Designed as a general-purpose O1 tool steel flat stock blank for use in tool room, die shop, and precision machining applications requiring oil-hardening grade material to AISI Type O1 specification.

Installation Notes

Machining and heat treatment of tool steel flat stock is performed by qualified machinists and tool and die makers. Work the material in the annealed condition before hardening. Oil quenching and tempering should follow established heat-treatment procedures for AISI O1 tool steel and be performed by personnel familiar with applicable shop safety requirements. Use appropriate personal protective equipment when cutting, grinding, or handling steel stock of this size and weight.