Starrett 54280 O1 Tool Steel Flat Stock 3/32x3/4x36 in

Product Description

The STARRETT 54280 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, jig and fixture fabrication, and precision machining applications. Manufactured to AISI Type O1 specifications, this flat stock measures 3/32 inches thick, 3/4 inches wide, and 36 inches long, with a thickness tolerance of plus or minus 0.001 inches. O1 tool steel offers good machinability in the annealed state and responds well to oil quench hardening, making it a standard choice for punches, dies, gauges, and custom tooling. This piece weighs 0.7 pounds and ships as a single bar.

This flat stock is suited for machine shops, tool and die operations, and maintenance departments that need a reliable, pre-dimensioned O1 bar for custom fabrication. The 36-inch length allows for multiple blanks to be cut from a single piece, reducing scrap and setup time. Its controlled tolerances support applications where dimensional consistency is required before and after heat treatment. Machinists, toolmakers, and die makers are the primary installers and fabricators of this material.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable heat treat response
• Thickness tolerance of plus or minus 0.001 inches for precision blanking
• Width tolerance of 0.000 to minus 0.005 inches
• Length tolerance of plus 0.015 inches
• Edge squareness held to 0.003 inches per inch on all edges
• Single 36-inch bar ready for layout and machining

Compatibility

Designed as a standard AISI O1 oil-hardening flat bar suitable for general toolmaking, die work, and precision fabrication applications where O1 tool steel stock is specified.

Installation Notes

O1 tool steel flat stock is worked by toolmakers and machinists using conventional milling, grinding, and sawing equipment. Material should be annealed prior to machining if maximum machinability is required. Heat treating to final hardness should be performed by qualified personnel following established oil-quench procedures for AISI O1 steel. Handle cut edges carefully, as ground surfaces can carry sharp burrs.