Starrett 54003 O1 Tool Steel Flat Stock 1/8x1-1/4x18 in

Product Description

The STARRETT 54003 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, jig and fixture fabrication, punches, dies, and precision machined components. Manufactured from AISI Type O1 tool steel, this flat stock measures 0.125 inches thick, 1.25 inches wide, and 18 inches long, and weighs 0.8 pounds. Thickness and squareness tolerances are held to plus or minus 0.001 inches, making it suitable for applications where dimensional consistency is critical before heat treatment. Machinists, tool and die makers, and maintenance professionals working in industrial and manufacturing environments are the primary installers and users of this material.

This flat stock is suited for fabricating cutting tools, gauges, shims, mold components, and other toolroom applications that require a readily machinable steel capable of through-hardening with an oil quench. The controlled tolerances allow direct use in precision layout and machining operations. Its 18-inch length provides adequate stock for most small toolroom components, and the 1.25-inch width accommodates a range of flat tool profiles without excessive material removal.

Key Features

• AISI Type O1 oil-hardening tool steel for consistent heat treat response
• Thickness of 0.125 inches with plus or minus 0.001 inch tolerance
• Width of 1.25 inches with tolerance of 0.0000 to 0.0050 inches under nominal
• Length of 18 inches with a plus 0.250 inch length tolerance and zero minus allowance
• Squareness held to 0.003 inches per inch on all edges
• Ready to machine in the annealed condition prior to hardening

Compatibility

Designed as a standard O1 oil-hardening tool steel flat bar for general toolroom, die shop, and precision machining applications requiring AISI Type O1 material specification.

Installation Notes

Cutting and machining of tool steel flat stock should be performed with appropriate metalworking equipment by qualified machinists or tool and die makers. Parts should be finish-machined before heat treating, as hardening and oil quenching will alter final dimensions. Follow the steel supplier or heat treater recommendations for austenitizing temperature and quench procedures specific to O1 tool steel. Always wear appropriate personal protective equipment when cutting, grinding, or handling flat stock.