Starrett 54123 O1 Tool Steel Flat Stock 3/8x2x18 in

Product Description

The STARRETT 54123 is an O1 oil-hardening tool steel flat stock bar ground and finished to close dimensional tolerances for toolmaking, die-making, and precision machining applications. Manufactured from AISI Type O1 tool steel, this flat stock measures 3/8 inches thick, 2 inches wide, and 18 inches long. Thickness tolerance is held to plus or minus 0.001 inches, and width tolerance runs from 0.000 to 0.005 inches on the minus side. Edge squareness is guaranteed to within 0.003 inches per inch across all edges. At 3.82 pounds per bar, this stock is ready for layout, machining, and heat treatment in the shop.

O1 tool steel flat stock is used in toolrooms, machine shops, and die shops where a stable, machinable steel is needed before hardening. Common applications include punches, dies, jigs, fixtures, cutting tools, and gauges. This bar ships in a single piece at 18 inches long, making it suitable for cutting multiple blanks or fabricating a single larger workpiece. Machinists and tool and die makers typically use this stock in the annealed condition before oil-quench hardening to final hardness.

Key Features

• AISI Type O1 oil-hardening tool steel for consistent hardenability
• Thickness tolerance of plus or minus 0.001 inches for precision fit-up
• Width tolerance of 0.000 to minus 0.005 inches
• Length tolerance of plus 0.250 inches, minus 0 inches
• Edge squareness held to 0.003 inches per inch on all edges
• Single-piece bar at 3.82 pounds — no cutting to length required for standard blanks

Compatibility

Designed as a standard O1 oil-hardening tool steel flat stock bar suitable for toolroom, die shop, and precision machining applications requiring close-tolerance ground stock in the annealed condition prior to heat treatment.

Installation Notes

Machining and heat treatment of tool steel flat stock should be performed by qualified machinists or tool and die makers familiar with O1 steel properties. Always anneal or stress-relieve the bar before finish machining when required by the application. Oil quench hardening should follow established heat treatment procedures for AISI O1 tool steel. Use appropriate personal protective equipment when cutting, grinding, or heat-treating steel stock.