Starrett 54259 O1 Tool Steel Flat Stock 1/16x1x36 in

Product Description

The STARRETT 54259 is an O1 oil-hardening tool steel flat stock bar designed for toolmakers, machinists, and die makers who need a reliable, pre-cut blank ready for hardening. Manufactured to AISI Type O1 specification, this flat stock measures 1/16 inch thick, 1 inch wide, and 36 inches long, with tight dimensional tolerances held across all four faces. The O1 alloy offers good machinability in the annealed state and responds well to oil-quench hardening, making it a standard choice for punches, dies, gauges, and cutting tools in both job-shop and production environments.

This flat stock bar suits applications in tool and die shops, maintenance and repair operations, and precision fabrication settings. It ships in the soft-annealed condition, allowing conventional machining, grinding, and drilling before heat treatment. The 36-inch length provides a standard working blank that can be cut to final length on a cold saw or abrasive cutoff. Thickness and squareness tolerances are held to precision levels appropriate for gauge and tooling blanks.

Key Features

• AISI Type O1 oil-hardening tool steel for consistent heat-treat response
• Thickness: 1/16 inch with tolerance of +/- 0.001 inches
• Width: 1 inch with tolerance of -0.000 to -0.005 inches
• Length: 36 inches with tolerance of +0.015 inches
• Edge squareness held to 0.003 inches per inch on all edges
• Ships in annealed condition — machines and grinds before hardening

Compatibility

Designed as a standard O1 oil-hardening tool steel flat stock blank suitable for punch, die, gauge, and general tooling fabrication where AISI Type O1 material is specified.

Installation Notes

Cutting and machining should be performed in the annealed state prior to heat treatment. Oil-quench hardening of O1 tool steel should be performed by a qualified heat treater or toolroom professional following established AISI O1 processing guidelines. Use appropriate personal protective equipment when cutting, grinding, or handling tool steel stock. Secure the bar firmly in a vise or fixture before any machining operation to prevent movement and maintain dimensional accuracy.