Starrett 54279 O1 Tool Steel Flat Stock 3/32x1/2x36 in

Product Description

The STARRETT 54279 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, jig fabrication, die making, and precision machining applications. Manufactured to AISI Type O1 specifications, this flat stock measures 3/32 inches thick, 1/2 inch wide, and 36 inches long, with a thickness tolerance of plus or minus 0.001 inches. The O1 grade offers good machinability in the annealed state and responds well to oil-quench hardening, making it a go-to material for tool and die shops that need consistent, predictable results from raw stock.

This flat stock is suited for fabricating cutting tools, punches, blanking dies, gauges, and similar precision components in both small-shop and production toolroom environments. The 36-inch length allows for efficient cut-to-size work with minimal waste. Machinists, tool and die makers, and metal fabricators working in industrial or maintenance-repair settings are the primary users of this material. Each piece ships individually, with a minimum order quantity of one.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable heat-treat response
• Tight thickness tolerance of plus or minus 0.001 inches for precision fitment
• Width tolerance of 0.000 to 0.005 inches for consistent stock sizing
• Length tolerance of plus 0.015 inches ensures full usable length
• Edge squareness held to 0.003 inches per inch on all edges
• Ready-to-machine annealed condition straight from stock

Compatibility

Designed as a standard AISI O1 oil-hardening tool steel flat bar suitable for general toolroom use wherever O1 grade flat stock in 3/32 x 1/2 x 36-inch dimensions is specified.

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. When hardening, follow established oil-quench procedures for O1 tool steel and allow parts to temper immediately after quench to reduce the risk of cracking. Always wear appropriate PPE including safety glasses and heat-resistant gloves during any heat-treating operations. Consult applicable shop safety standards and material data sheets before processing.