Starrett 54298 O1 Tool Steel Flat Stock 1/8x1/2x36 in

Product Description

The STARRETT 54298 is an O1 oil-hardening tool steel flat stock bar measuring 0.125 inches thick, 0.5 inches wide, and 36 inches long. Manufactured to AISI Type O1 material specification, this flat stock is used by machinists, toolmakers, and die makers who need a readily machinable steel that responds predictably to oil-quench hardening. Thickness tolerance is held to plus or minus 0.001 inches, making it suitable for precision tooling blanks, gauges, and fixture components where dimensional consistency before heat treat is critical. Edge squareness is maintained to 0.003 inches per inch across all edges.

O1 tool steel flat stock in this size range is a standard starting material for fabricating punches, dies, cutting tools, jigs, and general machine shop tooling. It ships in the annealed (soft) condition, which allows it to be sawed, milled, drilled, and ground before hardening. The 36-inch length provides flexibility for cutting multiple blanks from a single piece, reducing material waste. This stock is suited to small and medium machine shops, tool-and-die operations, and maintenance departments that perform in-house tooling work.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable hardening response
• Thickness held to plus or minus 0.001 inches for precision blank applications
• Width tolerance of 0.000 to minus 0.005 inches for consistent fit in close-tolerance setups
• Length tolerance of plus 0.015 inches, minus 0 inches
• Edge squareness maintained to 0.003 inches per inch on all edges
• Supplied in annealed condition — ready to machine before heat treatment

Compatibility

Designed as a general-purpose O1 oil-hardening tool steel flat stock suitable for use wherever AISI Type O1 annealed flat bar is specified in tooling, die-making, and precision machining applications.

Installation Notes

Cutting, grinding, and machining should be performed while the stock is in the annealed condition prior to any heat treatment. Oil-hardening heat treatment should be carried out by a qualified heat treater following established procedures for AISI O1 tool steel. Use appropriate personal protective equipment when cutting or grinding tool steel. Hardened tool steel components should be inspected for cracks or distortion before being placed into service.