Starrett 54220 O1 Tool Steel Flat Stock 1x5x18 Inch

Product Description

The STARRETT 54220 is an O1 oil-hardening tool steel flat stock bar measuring 1 inch thick, 5 inches wide, and 18 inches long. O1 is a general-purpose, cold-work tool steel valued for its excellent machinability in the annealed state and its ability to achieve high hardness after oil quenching. This flat stock ships in the annealed condition, ready for machining, grinding, and final heat treatment. It is commonly used by toolmakers, die makers, machinists, and maintenance shops to fabricate punches, dies, gauges, jigs, and cutting tools. The piece weighs approximately 25.5 pounds and holds tight dimensional tolerances straight from the mill.

This flat stock is suited for toolroom and production applications where close dimensional accuracy is required before heat treat. It is appropriate for both short-run prototype work and production tooling in job shops, maintenance facilities, and manufacturing environments. The annealed O1 material allows conventional milling, turning, and surface grinding prior to hardening and tempering. Stock length of 18 inches makes it practical for a wide range of die and fixture components without excessive remnant waste.

Key Features

• AISI Type O1 oil-hardening tool steel in annealed flat stock form
• Thickness tolerance of plus or minus 0.001 inches for precise fit in tooling applications
• Width tolerance of 0.000 to minus 0.005 inches
• Length tolerance of plus 0.250 inches, minus 0 inches
• Squareness held to 0.003 inches per inch on all edges
• Ready for machining, grinding, and subsequent oil-quench heat treatment

Compatibility

Designed as a standard AISI Type O1 oil-hardening tool steel flat stock suitable for fabricating punches, dies, gauges, cutting tools, and general toolroom components requiring oil-quench hardening.

Installation Notes

Cutting, grinding, and machining of tool steel flat stock should be performed by a qualified machinist or toolmaker using appropriate coolant to avoid surface overheating. Heat treatment, including hardening and tempering of O1 steel, must be performed by qualified personnel following established metallurgical procedures and applicable shop safety codes. Always wear appropriate PPE including eye protection and heat-resistant gloves when cutting or heat treating tool steel. Secure the workpiece properly before any machining operation to prevent movement or injury.