Starrett 54089 O1 Tool Steel Flat Stock 1/4x14x18 in

Product Description

The STARRETT 54089 is an O1 oil-hardening tool steel flat stock bar measuring 0.25 inches thick, 14 inches wide, and 18 inches long. Manufactured to AISI Type O1 specification, this flat stock is a high-carbon, oil-quench tool steel commonly used for dies, punches, gauges, and cutting tools where moderate toughness and good wear resistance are required. Thickness tolerance is held to plus or minus 0.001 inches, making it suitable for precision toolroom work. At 17.85 pounds, this is a substantial piece intended for professional machining, grinding, and fabrication operations. Machinists, tool-and-die makers, and industrial maintenance technicians are the primary users.

O1 tool steel flat stock is used in applications demanding close dimensional control before heat treatment. This piece is commonly machined or ground to final shape, then oil-hardened and tempered to achieve target hardness. Typical uses include blanking dies, forming dies, drill jigs, bushings, and precision gauging fixtures in both production shops and toolrooms. The 14-inch width and 18-inch length provide sufficient material for medium-to-large tooling blanks without the need for welding or joining multiple pieces.

Key Features

• AISI Type O1 oil-hardening tool steel — good machinability in the annealed state, hardens with an oil quench
• Thickness tolerance of plus or minus 0.001 inches for tight dimensional control
• Width tolerance of 0.000 to 0.015 inches (minus side only)
• Length tolerance of plus 0.250 inches, minus 0 inches
• Squareness held to 0.003 inches per inch on all edges
• Ready for machining, grinding, or EDM operations prior to heat treatment

Compatibility

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

Installation Notes

Machining and grinding should be performed in the annealed condition prior to heat treatment. Heat treatment of O1 tool steel requires controlled atmosphere or salt-bath equipment to avoid decarburization; this work is typically performed by a qualified heat treater or in a properly equipped tool shop. Follow AISI O1 manufacturer heat-treatment guidelines for austenitizing temperature, oil-quench medium, and tempering cycle. Personal protective equipment including safety glasses and appropriate gloves should be used when handling and cutting this material.