Starrett 54124 O1 Tool Steel Flat Stock 3/8x2-1/2x18 in

Product Description

The STARRETT 54124 is an O1 oil-hardening tool steel flat stock bar intended for toolmakers, machinists, and die makers who need a reliable, precision-ground blank for custom tooling, gauges, punches, and fixtures. Manufactured to AISI Type O1 specification, the bar measures 3/8 inch thick by 2-1/2 inches wide by 18 inches long and holds a thickness tolerance of plus or minus 0.001 inches. O1 tool steel offers excellent machinability in the annealed state and responds predictably to oil-quench hardening, making it a standard choice in tool and die shops as well as maintenance departments requiring shaped cutting or forming tools.

This flat stock is suited for light to medium tooling applications in job shops, production facilities, and maintenance shops. The annealed condition allows straightforward milling, grinding, and drilling before hardening. Typical applications include forming dies, blanking punches, drill jigs, wear pads, and precision fixtures. The 18-inch length provides enough material to yield multiple smaller blanks. A weight of approximately 4.78 pounds makes the bar easy to handle at the bench or bandsaw.

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 layout work
• Width tolerance of 0.0000 to 0.0050 inches under nominal
• Length tolerance of plus 0.250 inches, minus 0 inches
• Edge squareness held to 0.003 inches per inch on all edges
• Annealed condition supports machining, grinding, and drilling prior to hardening

Compatibility

Designed as a standard AISI O1 oil-hardening tool steel flat bar suitable for general toolmaking, die making, and precision fixture fabrication where O1 material specification is required.

Installation Notes

Cutting, grinding, and heat treatment of tool steel should be performed by a qualified machinist or tool and die maker familiar with O1 oil-quench hardening procedures. Secure the workpiece properly before any sawing or milling operation and use appropriate personal protective equipment. Heat treatment, including austenitizing and oil quenching, must follow established metallurgical guidelines for AISI O1 to achieve target hardness without cracking. Allow the bar to reach full ambient temperature before precise layout or grinding work.