Starrett 54266 O1 Tool Steel Flat Stock 1/16x3.5x36in

Product Description

The STARRETT 54266 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die work, jig fabrication, and precision machining applications. Manufactured to AISI Type O1 specifications, this flat stock measures 1/16 inch thick, 3-1/2 inches wide, and 36 inches long, and weighs 2.23 pounds. Thickness tolerance is held to plus or minus 0.001 inches, making it suitable for applications requiring close dimensional control before hardening. Machinists, tool and die makers, and metal fabricators work with this material to produce punches, dies, gauges, and custom cutting tools. O1 tool steel machines readily in the annealed state and responds well to oil-quench heat treatment to achieve high hardness.

This flat stock is suited for job shop and production toolroom environments where O1 tool steel is the specified material. Typical applications include blanking dies, trim dies, form tools, arbors, and precision fixtures in both one-off and short-run manufacturing. The 36-inch bar length allows multiple blanks to be cut from a single piece, reducing material waste. Machinists and tool and die makers working in metalworking shops, maintenance departments, and manufacturing facilities are the primary users of this material in both manual and CNC machining operations.

Key Features

• AISI Type O1 oil-hardening tool steel for consistent heat-treat response
• Thickness held to plus or minus 0.001 inches for close-tolerance machining
• Width tolerance of 0.000 to minus 0.005 inches for predictable stock removal
• Length tolerance of plus 0.015 inches ensures full nominal length
• Edge squareness of 0.003 inches per inch across all edges
• 36-inch bar length suitable for cutting multiple tool blanks

Compatibility

Designed as a standard AISI O1 oil-hardening tool steel flat bar suitable for general toolroom use wherever O1 flat stock at 1/16 x 3-1/2 x 36 inches is specified.

Installation Notes

Cutting, grinding, and machining of tool steel flat stock should be performed by qualified machinists or tool and die makers using appropriate metalworking equipment. Wear appropriate personal protective equipment when sawing, milling, or grinding this material. Heat treatment, including hardening and tempering, should follow AISI O1 guidelines for oil quenching and should be performed in a controlled environment by personnel familiar with tool steel metallurgy. Allow the workpiece to cool properly between machining operations to avoid altering material properties prior to heat treatment.