Starrett 56986 O1 Tool Steel Flat Stock 1/4x8x18 in

Product Description

The STARRETT 56986 is an O1 oil-hardening tool steel flat stock blank sized at 0.25 inches thick, 8 inches wide, and 18 inches long. O1 tool steel is a general-purpose cold-work steel valued for its machinability in the annealed state and its ability to achieve high surface hardness after oil-quench heat treatment. This flat stock is used by toolmakers, machinists, and die shops as raw material for punches, dies, gauges, cutting tools, and precision fixtures. Thickness and width tolerances of +0.0100 to 0.0150 inches and a length tolerance of +0.2500 inches ensure consistent stock removal and predictable finished dimensions on the machine.

This flat stock is suited for job shops, tool and die operations, and maintenance departments that require a reliable pre-cut blank ready for layout and machining. The 8-inch width and 18-inch length provide enough material for a wide range of medium-sized tooling applications without excessive saw-down waste. Edge squareness is held to 0.003 inches per inch across all edges, which supports accurate setup on surface grinders and milling machines without requiring additional squaring passes on every piece.

Key Features

• AISI Type O1 oil-hardening tool steel construction for reliable heat-treat response
• Thickness and width tolerances of +0.0100 to +0.0150 inches for consistent stock
• Length tolerance of +0.2500 inches provides clean saw-cut ends with finish allowance
• Edge squareness of 0.003 inches per inch on all edges supports accurate machine setup
• Pre-cut flat stock format reduces material prep time versus full-length bar stock

Compatibility

Designed as a general-purpose O1 tool steel flat blank suitable for use in any toolmaking, die making, or precision machining application that calls for AISI Type O1 oil-hardening steel in flat stock form.

Installation Notes

O1 tool steel flat stock is machined and ground in the annealed condition before heat treatment. A licensed toolmaker or machinist should perform heat treating, as improper quench rates can cause warping or cracking. Always follow established shop safety practices when grinding or machining tool steel, including appropriate eye protection and dust controls. Allow the material to normalize to shop temperature before precision layout or measurement.