Starrett 54242 O1 Tool Steel Flat Stock 1-1/2x2-1/2x18in

Product Description

The STARRETT 54242 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, and precision machining applications. Manufactured to AISI Type O1 material specification, this flat stock measures 1-1/2 inches thick, 2-1/2 inches wide, and 18 inches long, and weighs approximately 19.13 pounds. O1 tool steel is a general-purpose oil-hardening grade known for its dimensional stability during heat treatment, making it a dependable choice for jigs, fixtures, punches, and cutting tools. Machinists and toolmakers work with this stock in its annealed state before hardening to final application requirements.

This flat stock is suited to machine shops, tool and die operations, and fabrication environments where tight tolerances are required before and after heat treatment. The 18-inch length provides usable bar stock for a range of tooling projects without excessive material waste. With a thickness tolerance of plus or minus 0.001 inches and an edge squareness specification of 0.003 per inch, this bar arrives ready for layout and machining with minimal stock removal required on reference surfaces.

Key Features

• AISI Type O1 oil-hardening tool steel for reliable response to standard oil-quench heat treatment
• Thickness tolerance of plus or minus 0.001 inches for close-tolerance tooling work
• Width tolerance of 0.000 to minus 0.005 inches for consistent fit in precision setups
• Length tolerance of plus 0.250 inches to allow for facing and squaring to final length
• Edge squareness held to 0.003 inches per inch on all edges
• Annealed condition allows machining prior to hardening

Compatibility

Designed as a general-purpose O1 oil-hardening tool steel flat bar for use in toolmaking, die work, and precision fixture fabrication wherever AISI Type O1 material specification is required.

Installation Notes

Machining and heat treatment of tool steel should be performed by qualified machinists or toolmakers familiar with O1 oil-hardening procedures. Follow established shop safety practices when cutting, grinding, or milling tool steel stock. Heat treatment, including hardening and tempering, should follow the material manufacturer guidelines for AISI O1 and applicable shop safety codes. Always allow the workpiece to reach ambient temperature before taking final measurements.