Starrett 54191 O1 Tool Steel Flat Stock 3/4x2x18 in

Product Description

The STARRETT 54191 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die work, and precision machining applications. It is machined from AISI Type O1 tool steel, a general-purpose oil-hardening grade known for its dimensional stability during heat treatment and its ability to hold a sharp edge after hardening. This piece measures 0.75 inches thick, 2 inches wide, and 18 inches long, and weighs approximately 7.65 pounds. Thickness and squareness tolerances are held to plus or minus 0.001 inches, making it suitable for applications where close-tolerance blanks are required before finish grinding or hardening.

This flat stock is intended for use by tool and die makers, machinists, and metalworking professionals fabricating punches, dies, gauges, jigs, fixtures, and cutting tools. It ships in an annealed condition, allowing it to be machined, drilled, and shaped prior to oil hardening and tempering. The 18-inch length provides sufficient stock for a range of small to medium tooling projects in job shop and manufacturing environments.

Key Features

• AISI Type O1 oil-hardening tool steel — machinable in annealed state, hardenable by oil quench
• Thickness tolerance: plus or minus 0.001 inches for consistent fit in precision setups
• Width tolerance: 0.000 to minus 0.005 inches
• Length tolerance: plus 0.250 inches, minus 0 inches
• Squareness: edge squareness held to 0.003 inches per inch on all edges
• Ready to machine, grind, or cut to final dimensions before heat treatment

Compatibility

Designed as a standard O1 oil-hardening tool steel flat bar for use in general toolmaking, die making, and precision machining applications where AISI Type O1 material specification is required.

Installation Notes

Machining and cutting of this flat stock should be performed with tooling rated for tool steel in the annealed condition. Hardening requires oil quenching per the appropriate heat treatment procedure for AISI O1 tool steel — consult the material data sheet for austenitizing and tempering temperatures before processing. Wear appropriate PPE when grinding or cutting hardened tool steel. This material is not a finished component and requires fabrication before use in any tooling or fixture assembly.