Starrett 54465 O1 Tool Steel Flat Stock 5/8 X 1-1/2 X 36 in

Product Description

The STARRETT 54465 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die work, and precision machining applications. Manufactured from AISI Type O1 tool steel, this flat stock measures 0.625 inches thick, 1.5 inches wide, and 36 inches long, with a weight of 9.56 pounds. Thickness and squareness tolerances are held to plus or minus 0.001 inches, making it suitable for applications where dimensional accuracy is critical before and after heat treatment. Machinists, tool and die makers, and metalworking professionals select O1 flat stock for its consistent pre-hardened geometry and predictable response to oil-quench hardening.

This flat stock is used in the fabrication of punches, dies, gauges, jigs, fixtures, and cutting tools in both job shop and production environments. The 36-inch length accommodates a wide range of blanking and machining operations before final profiling and heat treatment. Width tolerance runs from negative 0 to negative 0.005 inches, and length tolerance is plus 0.015 inches, consistent with standard stock material allowances for finish machining. Edge squareness is held to 0.003 inches per inch across all edges, supporting reliable layout and setup work without additional truing.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable hardening response in oil quench
• Thickness of 0.625 inches with plus or minus 0.001 inch tolerance for close-tolerance blanks
• Width of 1.5 inches with a tolerance of negative 0 to negative 0.005 inches
• Length of 36 inches with a plus 0.015 inch tolerance to allow for finish cuts
• Edge squareness held to 0.003 inches per inch on all edges
• Single-piece quantity suitable for prototype, repair, and low-volume tooling work

Compatibility

Designed as a standard AISI Type O1 oil-hardening tool steel flat stock suitable for general toolmaking, die making, and precision machining applications requiring oil-quench heat treatment.

Installation Notes

O1 tool steel flat stock is worked by machinists and tool and die makers using conventional milling, grinding, and sawing equipment. Always anneal or verify material condition before machining to critical dimensions. Heat treatment should be performed by qualified personnel following established oil-quench procedures for O1 tool steel; improper quench rate or temperature control can result in distortion or cracking. Use appropriate personal protective equipment when cutting, grinding, or heat-treating tool steel.