Starrett 54050 O1 Tool Steel Flat Stock 3/16x2-1/2x18 in

Product Description

The STARRETT 54050 is a flat stock bar of AISI Type O1 oil-hardening tool steel, supplied in a 3/16 inch thick by 2-1/2 inch wide by 18 inch length. O1 tool steel is a general-purpose oil-hardening grade widely used in toolmaking, die work, jigs, fixtures, and precision machining applications. It offers good machinability in the annealed state and achieves high hardness after oil quench heat treatment. Machinists, tool-and-die makers, and metalworking fabricators stock this material for producing punches, dies, gauges, and custom tooling components that require close dimensional tolerances and consistent metallurgical properties.

This flat stock is suited for machine shops, tool rooms, and fabrication environments where AISI O1 tool steel is the specified material. The 18 inch length and 3/16 inch by 2-1/2 inch cross section make it appropriate for smaller die components, thin punches, blades, and precision flat tooling. The pre-sized stock reduces raw material prep time, allowing machinists to work directly to layout and cut operations without extensive milling of oversize bar stock.

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 dimensional control
• Width tolerance of 0.000 to minus 0.005 inches
• Length tolerance of plus 0.250 inches, minus 0 inches
• Edge squareness held to 0.003 inches per inch on all edges
• Pre-cut flat stock minimizes raw material handling and setup time

Compatibility

Designed as a general-purpose O1 oil-hardening tool steel flat stock for toolmaking, die making, and precision machining applications requiring AISI Type O1 material specification.

Installation Notes

Machining and heat treatment of O1 tool steel should be performed by qualified tool-and-die makers or machinists familiar with oil-hardening procedures. Always follow established shop safety practices when cutting, grinding, or heat treating tool steel, including appropriate PPE and ventilation. Oil quench heat treatment requires controlled temperatures and a suitable quench medium; follow AISI O1 recommended heat treat parameters from a qualified metallurgical reference. Handle stock carefully to avoid surface nicks or deformation that could affect finished tool tolerances.