Starrett 54404 O1 Tool Steel Flat Stock 5/16x6x36 in

Product Description

The STARRETT 54404 is an O1 oil-hardening tool steel flat stock bar used in precision toolmaking, die making, and machine shop applications. Measuring 5/16 inches thick, 6 inches wide, and 36 inches long, this flat stock is manufactured to tight dimensional tolerances: plus or minus 0.001 inches on thickness, 0.000 to minus 0.005 inches on width, and plus 0.015 inches on length. Edge squareness is held to 0.003 inches per inch across all edges. At 19.13 pounds, this is a substantial piece suited for fabricating punches, dies, gauges, and tooling blanks requiring post-machining heat treatment.

O1 tool steel is a general-purpose oil-hardening grade widely used across job shops, tool and die operations, and precision machining environments. This flat stock is a starting-point workpiece — machinists and toolmakers cut, mill, grind, and drill it to net shape before oil-quench hardening and tempering. The 6-inch width and 36-inch length provide ample material for multiple blanks from a single piece. It is appropriate for both prototype and production tooling work in both light industrial and heavy manufacturing settings.

Key Features

• AISI Type O1 oil-hardening tool steel for excellent machinability in the annealed state and good wear resistance after hardening
• Thickness held to plus or minus 0.001 inches for consistent stock removal planning
• Width tolerance of 0.000 to minus 0.005 inches ensures the piece is never oversized on width
• Edge squareness of 0.003 inches per inch on all edges reduces setup time at the mill or surface grinder
• 36-inch length yields multiple blanks from a single bar with minimal material waste
• Ships as a single full-length piece with a minimum order quantity of 1

Compatibility

Designed as a general-purpose O1 tool steel flat stock blank for toolmaking, die making, and precision machining applications where oil-hardening tool steel is specified by drawing or process requirement.

Installation Notes

Cutting, drilling, and grinding of O1 tool steel flat stock should be performed by a qualified machinist or toolmaker using appropriate coolant to prevent localized heat buildup. Heat treatment — annealing, hardening, and tempering — should follow AISI O1 specifications and be performed by a qualified heat treat shop or trained personnel. Always use proper personal protective equipment when cutting or grinding tool steel. Follow applicable shop safety codes for metalworking operations.