Starrett 57033 O1 Tool Steel Flat Stock 5/8x1-1/4x18 in

Product Description

The STARRETT 57033 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 0.625 inches thick, 1.25 inches wide, and 18 inches long. Thickness and width tolerances run +0.0100 to +0.0150 inches, and length tolerance is +0.2500 inches. Edge squareness is held to 0.003 inches per inch across all edges. At 3.99 pounds, this bar is sized for bench-scale tool and fixture work. Machinists, tool and die makers, and industrial maintenance technicians are the primary users of this material.

O1 tool steel flat stock is used when a readily machinable steel is needed that can be oil-hardened to high hardness after rough machining. Typical applications include punches, dies, gauges, bushings, fixture components, and small cutting tools. The 18-inch length suits common bench and mill operations without requiring additional cut-down before use. This stock is suited for shop environments where close-tolerance ground stock simplifies final fitting and layout work.

Key Features

• AISI Type O1 oil-hardening tool steel for reliable heat-treat response
• Thickness: 0.625 inches with +0.0100 to +0.0150 inch tolerance
• Width: 1.25 inches with +0.0100 to +0.0150 inch tolerance
• Length: 18 inches with +0.2500 inch tolerance
• Edge squareness held to 0.003 inches per inch on all edges
• Ready for layout, machining, and subsequent oil-hardening heat treatment

Compatibility

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

Installation Notes

Machining and heat treatment of tool steel flat stock is typically performed by machinists or tool and die makers using conventional milling, grinding, and turning equipment. Always rough machine to near-final dimensions before oil-hardening heat treatment, as post-hardening grinding is required to reach final tolerances. Follow the material supplier heat-treat guidelines for O1 steel; improper quench technique can cause warping or cracking. Wear appropriate PPE when machining or handling heat-treated steel.