Starrett 54204 O1 Tool Steel Flat Stock 7/8x1-1/4x18in

Product Description

The STARRETT 54204 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, and precision machining applications. Manufactured to AISI Type O1 specification, this flat stock measures 7/8 inch thick, 1-1/4 inches wide, and 18 inches long, with a finished weight of 5.58 pounds. Thickness tolerance is held to +/- 0.001 inches, making it suitable for applications where dimensional accuracy before heat treatment is critical. Machinists, tool and die makers, and precision fabricators work with this material when building punches, dies, gauges, and fixtures that require a steel capable of through-hardening in oil quench.

O1 tool steel flat stock is a staple in job shops, tool rooms, and maintenance departments handling precision fabrication work. This bar is supplied in the annealed condition, ready for machining to final dimensions before heat treatment. The 18-inch length suits a wide range of short-run tooling projects where a standard off-the-shelf bar eliminates material prep time. It is commonly used in both light industrial and heavy production toolroom environments wherever O1 is the specified grade.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable heat treatment response
• Thickness: 7/8 inch with +/- 0.001 inch tolerance
• Width: 1-1/4 inches with tolerance of 0.0000 to -0.005 inches
• Length: 18 inches with +0.250 inch length tolerance
• Edge squareness held to 0.003 inches per inch on all edges
• Supplied annealed for ease of machining prior to hardening

Compatibility

Designed as a standard O1 oil-hardening tool steel flat stock suitable for general toolroom use wherever AISI Type O1 material is specified for punches, dies, gauges, and similar precision tooling components.

Installation Notes

Cutting, drilling, and grinding of tool steel flat stock should be performed with tooling rated for hardened or semi-hard ferrous materials. Heat treatment, including oil quenching and tempering, should be carried out by qualified personnel following established metallurgical procedures for AISI O1 steel. Secure workpieces firmly during machining operations to maintain dimensional tolerances. Consult applicable shop safety standards when handling cutting fluids and quench oils.