Starrett 57031 O1 Tool Steel Flat Stock 5/8x3/4x18 in

Product Description

The STARRETT 57031 is an O1 oil-hardening tool steel flat stock bar measuring 0.625 inches thick, 0.75 inches wide, and 18 inches long. Manufactured to AISI Type O1 specification, this tool steel is designed for applications requiring a material that can be hardened through an oil-quench heat treatment process. The flat stock ships in an annealed, machinable condition and is held to close dimensional tolerances, making it suitable for fabricating punches, dies, gauges, knives, and other precision tooling components. Machinists, tool-and-die makers, and metalworking professionals are the primary users of this stock material.

This flat stock is well suited for job shop and production toolroom environments where O1 tool steel is the specified material. Its 18-inch length accommodates a wide range of short-run tooling blanks without excessive saw-off waste. The ground and close-tolerance surfaces reduce setup time when milling or grinding to final dimensions. Edge squareness is held to 0.003 inches per inch across all edges, supporting accurate layout and machining from the stock surface.

Key Features

• AISI Type O1 oil-hardening tool steel — good machinability in the annealed state, high hardness after oil quench
• Thickness tolerance of +0.010 to +0.015 inches ensures consistent stock removal allowance
• Width tolerance of +0.010 to +0.015 inches on the 0.75-inch dimension
• Length tolerance of +0.25 inches on the 18-inch length
• Edge squareness held to 0.003 inches per inch on all edges
• Ready-to-machine flat stock format — no additional surface preparation required before layout

Compatibility

Designed as a standard O1 oil-hardening tool steel flat stock blank for general toolroom and die-making applications where AISI Type O1 material is specified.

Installation Notes

Cutting, grinding, and heat treating of tool steel should be performed by qualified machinists or tool-and-die makers using appropriate metalworking equipment. Follow the material supplier heat-treat data sheet for proper austenitizing temperature, oil-quench procedure, and tempering cycles specific to O1 tool steel before placing any hardened component into service. Use appropriate personal protective equipment when cutting or grinding. Dispose of metalworking fluids and quench oil in accordance with applicable local environmental regulations.