Starrett 54126 O1 Tool Steel Flat Stock 3/8x3-1/2x18 in

Product Description

The STARRETT 54126 is an O1 oil-hardening tool steel flat stock bar sized at 3/8 inch thick, 3-1/2 inches wide, and 18 inches long. O1 is an oil-hardening cold-work tool steel known for its fine grain structure, excellent machinability in the annealed state, and good dimensional stability during heat treatment. This flat stock is used by tool and die makers, machinists, and metalworking tradespeople to fabricate punches, dies, blades, gauges, and other precision tooling components. Thickness tolerance is held to plus or minus 0.001 inches, making it suitable for applications that require close dimensional control before and after hardening.

This flat stock is suited for job shop, maintenance, and production toolmaking environments. It is commonly used to produce custom cutting tools, forming dies, stripper plates, and wear-resistant components in both small-shop and industrial settings. The 18-inch length provides enough material for most single-piece tooling blanks or can be cut down for shorter applications. Machinists working in HVAC equipment manufacturing, electrical panel fabrication shops, and general metal fabrication will find this a practical tooling material.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable heat-treat response
• Thickness tolerance of plus or minus 0.001 inches for close dimensional control
• Width tolerance of 0.000 to minus 0.005 inches
• Length tolerance of plus 0.250 inches
• Squareness held to 0.003 inches per inch on all edges
• Annealed condition allows machining before hardening

Compatibility

Designed as a standard O1 oil-hardening tool steel flat stock blank suitable for general toolmaking and machining applications where AISI O1 material specification is required.

Installation Notes

Cutting, grinding, and machining should be performed in the annealed state prior to heat treatment. Oil hardening requires controlled heating to austenizing temperature followed by a quench in oil — this process should be performed by a qualified heat treater or tool and die professional following established metallurgical procedures. Use appropriate personal protective equipment when cutting or grinding tool steel. Deburr all edges before handling to prevent injury.