Starrett 54230 O1 Tool Steel Flat Stock 1-1/4x1-1/4x18in

Product Description

The STARRETT 54230 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, fixture building, die making, and precision machining applications. Manufactured to AISI Type O1 specifications, this flat stock measures 1-1/4 inches thick by 1-1/4 inches wide by 18 inches long and weighs approximately 7.97 pounds. Thickness and squareness tolerances are held to plus or minus 0.001 inches, making it suitable for applications requiring tight dimensional control before hardening. It ships in an annealed, machinable condition and is intended for heat treatment by a qualified machinist or toolmaker.

O1 tool steel flat stock is used in job shops, tool and die operations, and maintenance machining environments. Typical applications include punches, dies, gauges, lathe centers, knives, and custom tooling components. The 18-inch length provides practical stock for multiple smaller parts or a single mid-size tool blank. This material is processed by machinists and toolmakers who rough-machine the blank, then oil-quench harden and temper it to the required service hardness.

Key Features

• AISI Type O1 oil-hardening tool steel — machines well in annealed state, oil-quenches to high hardness
• 1-1/4 x 1-1/4 x 18 inch section — square cross-section blank ready for layout and machining
• Thickness and squareness tolerance: plus or minus 0.001 inches for tight pre-hardening dimensional control
• Width tolerance: 0.0000 to 0.0050 inches (minus 0 / minus 0.005 inches)
• Length tolerance: plus 0.250 inches / minus 0 inches
• Edge squareness: 0.003 inches per inch on all edges

Compatibility

Designed as a standard AISI O1 oil-hardening tool steel flat stock blank suitable for general toolmaking, die making, and precision machining applications requiring an oil-hardening grade tool steel.

Installation Notes

O1 tool steel flat stock is machined and shaped by qualified machinists or toolmakers using conventional milling, turning, and grinding equipment. Heat treatment — including austenitizing, oil quenching, and tempering — should be performed by personnel familiar with tool steel processing per the material manufacturer's guidelines. Always wear appropriate PPE when machining or heat-treating tool steel. Follow your shop's established procedures for handling and storing pre-hardened tool steel stock to prevent corrosion or damage to machined surfaces.