Starrett 54525 O1 Tool Steel Flat Stock 1-1/4x5x36 in

Product Description

The STARRETT 54525 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, jig fabrication, and precision machining applications. Manufactured to AISI Type O1 specifications, this flat stock measures 1-1/4 inches thick, 5 inches wide, and 36 inches long, and ships in a ready-to-machine condition before hardening. Thickness tolerance is held to plus or minus 0.001 inches, making this stock suitable for applications where dimensional consistency prior to heat treatment is critical. Machinists, tool and die makers, and metal fabricators rely on O1 flat stock for its predictable oil-quench hardening response and good wear resistance after heat treatment.

O1 oil-hardening tool steel flat stock is used in both job shop and production toolroom environments. Typical applications include punches, dies, gauges, blades, and custom tooling components. This bar is supplied in an annealed condition, allowing conventional machining before the heat-treat cycle. The 36-inch length is a standard toolroom size that accommodates most bench and mill setups without requiring additional material removal for rough stock preparation.

Key Features

• AISI Type O1 oil-hardening tool steel material specification
• Thickness held to plus or minus 0.001 inches for consistent pre-hardening machining
• Width tolerance of 0.000 to 0.005 inches under nominal
• Length tolerance of plus 0.015 inches over nominal
• Edge squareness held to 0.003 inches per inch on all edges
• Supplied in annealed condition — ready for machining prior to heat treatment

Compatibility

Designed as a standard AISI O1 oil-hardening tool steel flat stock suitable for general toolroom, die making, and precision fabrication applications requiring pre-hardened stock preparation.

Installation Notes

Cutting and machining of tool steel flat stock should be performed with appropriate carbide or high-speed steel tooling rated for tool steel. Secure the workpiece firmly before sawing or milling to maintain dimensional accuracy and operator safety. Heat treatment — including austenitizing, oil quenching, and tempering — should be performed by qualified personnel following established metallurgical procedures for AISI O1 steel. Always wear appropriate PPE when handling, cutting, or heat-treating tool steel stock.