Starrett 54489 O1 Tool Steel Flat Stock 0.75x10x36 in

Product Description

The STARRETT 54489 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, jig and fixture fabrication, and precision machining applications. Manufactured to AISI Type O1 specification, this flat stock measures 0.75 inches thick, 10 inches wide, and 36 inches long, and weighs 76.5 pounds. Thickness and squareness tolerances are held to plus or minus 0.001 inches, with edge squareness controlled to 0.003 inches per inch. O1 tool steel offers good machinability in the annealed state and responds well to oil-quench hardening, making it a standard choice for precision tooling blanks that require post-machining heat treatment.

This flat stock is suited for machine shops, tool and die shops, and maintenance departments that produce custom tooling, punches, dies, gauges, and wear components. The large 10 inches by 36 inches face provides substantial material for layout and blanking of multiple parts from a single piece. Its annealed condition allows conventional milling, drilling, grinding, and sawing prior to hardening. Machinists and tool and die makers working in both job-shop and production environments will find this size appropriate for medium to large tooling applications.

Key Features

• AISI Type O1 oil-hardening tool steel — machines freely in annealed state, hardens via oil quench
• Thickness tolerance of plus or minus 0.001 inches for precise stock removal planning
• Length tolerance of plus 0.015 inches, minus 0 inches — stock is never delivered short
• Width tolerance of 0 to 0.015 inches undersize
• Edge squareness held to 0.003 inches per inch across all edges
• Single-piece packaging at 76.5 pounds — ready for direct shop use

Compatibility

Designed as a standard AISI O1 oil-hardening tool steel flat stock for general toolmaking and die-making applications requiring precision-ground or precision-rolled flat bar in this thickness and width.

Installation Notes

Cutting, grinding, and machining of tool steel flat stock should be performed by qualified machinists or tool and die makers using appropriate cutting fluids and speeds for tool steel. Secure the workpiece properly before any cutting operation to prevent movement under load. Heat treatment — including hardening and tempering — should follow established metallurgical procedures for AISI O1 tool steel and be performed by qualified personnel. At 76.5 pounds, safe material handling practices and appropriate lifting equipment are recommended.