Starrett 54176 O1 Tool Steel Flat Stock 5/8x1-1/2x18 in

Product Description

The STARRETT 54176 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die work, punches, gauges, and precision fixtures. Manufactured to AISI Type O1 material specification, this flat stock measures 5/8 inches thick, 1-1/2 inches wide, and 18 inches long, and weighs approximately 4.78 pounds. O1 tool steel offers excellent machinability in the annealed state and achieves high hardness after oil-quench heat treatment, making it a dependable choice for fabricating custom tooling components. Machinists, tool-and-die makers, and maintenance professionals work with this material to produce close-tolerance parts that require a hardened working surface.

This flat stock is suited for job-shop and production toolroom environments where custom tooling, jigs, punches, or wear components are cut, machined, and heat-treated in-house. The 18-inch length provides enough material for most single-piece tooling applications without the waste associated with longer bar stock. It is stocked in the annealed condition, ready for machining prior to oil-hardening heat treatment. Typical users include tool-and-die shops, maintenance departments, and precision machine shops that require small quantities of ground flat stock for prototype or replacement tooling.

Key Features

• AISI Type O1 oil-hardening tool steel — machines cleanly in the annealed state and hardens with an oil quench
• Ground flat stock with tight thickness tolerance of plus or minus 0.001 inches for close-tolerance tooling applications
• Width tolerance of 0.000 to minus 0.005 inches ensures predictable material removal during finish grinding
• Length tolerance of plus 0.250 inches, minus 0 inches — stock is never shorter than the nominal 18 inches
• Edge squareness held to 0.003 inches per inch across all edges
• Weighs 4.78 pounds — appropriate for manual handling and standard milling or surface-grinding setups

Compatibility

Designed as a general-purpose O1 oil-hardening tool steel flat stock suitable for custom toolmaking, die components, punches, and precision fixtures in any shop equipped to machine and heat-treat tool steel.

Installation Notes

Cutting and machining of tool steel flat stock should be performed by qualified machinists or tool-and-die professionals using appropriate cutting fluids and carbide or high-speed steel tooling. Heat treatment to final hardness requires controlled furnace equipment and proper oil-quench procedures — consult AISI O1 heat-treat guidelines for soak temperatures and quench media. Always allow the bar to reach ambient temperature before taking final tolerance measurements. Secure the workpiece firmly in a vise or fixture before any cutting or grinding operation.