Starrett 57059 O1 Tool Steel Flat Stock 1x3x18 in

Product Description

The STARRETT 57059 is an O1 oil-hardening tool steel flat stock bar used in precision toolmaking, die making, jig fabrication, and general machine shop work. Measuring 1 inch thick, 3 inches wide, and 18 inches long, this flat stock is manufactured to AISI Type O1 specification, a general-purpose oil-hardening tool steel known for its dimensional stability during heat treatment. Thickness and width tolerances are held to +0.0100 to 0.0150 inches, and length tolerance is +0.2500 inches. Squareness is controlled to 0.003 inches per inch on all edges, making this stock suitable for precision layout and machining operations before hardening.

O1 tool steel flat stock at this size is commonly used in tool and die shops, maintenance and repair operations, and prototype fabrication environments. It is well suited for applications requiring a blank that will be machined, ground, or EDM-cut to final form and then oil-quench hardened. Machinists and tool makers working in both job shop and production environments select this size for punch blanks, wear plates, gauges, and small die components where close-tolerance annealed stock is required prior to heat treat.

Key Features

• AISI Type O1 oil-hardening tool steel material specification
• Thickness and width tolerances of +0.0100 to +0.0150 inches for predictable stock removal during machining
• Length tolerance of +0.2500 inches provides sufficient extra material for facing operations
• Squareness controlled to 0.003 inches per inch on all edges for accurate layout reference
• Annealed condition allows machining before oil-quench hardening
• Single-piece package quantity supports low-volume tool room and prototype applications

Compatibility

Designed as a standard AISI O1 oil-hardening flat stock blank for use in tool and die, jig and fixture, and general precision machining applications where pre-hardened or anneal-and-harden workflow is required.

Installation Notes

Material handling and cutting should be performed by qualified machinists or tool makers using appropriate metalworking equipment. Always wear appropriate PPE when cutting, grinding, or heat-treating tool steel. Heat treatment, including annealing, hardening, and tempering, should follow AISI O1 guidelines and should be performed by personnel familiar with tool steel metallurgy. Secure stock properly in a vise or fixture before any cutting or grinding operation to prevent movement.