Starrett 54521 O1 Tool Steel Flat Stock 1-1/4x2x36 in

Product Description

The STARRETT 54521 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, jig construction, and precision machining applications. Manufactured from AISI Type O1 tool steel, this flat stock measures 1-1/4 inches thick, 2 inches wide, and 36 inches long, and weighs 25.5 pounds. O1 tool steel is a tungsten-alloyed oil-hardening grade known for its dimensional stability during heat treat and its ability to hold a sharp edge after hardening. Thickness and squareness tolerances are held to tight limits, making this bar suitable for work requiring consistent stock removal and predictable hardened dimensions. Machinists, tool and die makers, and toolroom technicians are the primary installers and users of this material.

This flat stock is suited for fabricating punches, dies, gauges, cutting tools, arbors, and general toolroom parts in both job shop and production environments. The 36-inch length provides sufficient material for multiple blanks from a single piece. O1 grade is appropriate for applications that do not require the extreme wear resistance of D2 or the toughness of A2, but demand good machinability in the annealed state and reliable oil-quench hardening response. This bar is sold as a single piece per package.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable heat treat response
• Thickness tolerance of plus or minus 0.001 inches for consistent stock dimensions
• Length tolerance of plus 0.015 inches, minus 0 inches
• Width tolerance of 0.0000 to minus 0.005 inches
• Squareness held to 0.003 inches per inch on all edges
• Annealed condition allows machining prior to hardening

Compatibility

Designed as a standard O1 oil-hardening tool steel flat bar for general toolroom, die making, and precision machining applications requiring AISI Type O1 material specification.

Installation Notes

Cutting, grinding, and machining of tool steel flat stock should be performed by qualified machinists or tool and die makers using appropriate metalworking equipment. Material should be handled in the annealed state prior to heat treatment; follow established oil-quench hardening procedures for O1 grade per applicable heat treat specifications. Wear appropriate PPE including eye protection and gloves when cutting or grinding. Do not attempt to cold-bend or straighten tool steel flat stock, as cracking may result.