Starrett 54539 O1 Tool Steel Flat Stock 2x2x36 in

Product Description

The STARRETT 54539 is an O1 oil-hardening tool steel flat stock bar measuring 2 inches thick by 2 inches wide by 36 inches long and weighing 40.8 pounds. Made from AISI Type O1 tool steel, this flat stock is precision ground to tight dimensional tolerances, making it well suited for toolroom applications where accuracy and machinability before hardening are critical. The thickness tolerance holds to plus or minus 0.001 inches, and the squareness is held to 0.003 inches per inch on all edges. O1 tool steel offers good wear resistance and toughness after oil quench hardening, making it a common choice for dies, punches, gauges, and cutting tools.

This flat stock is used in industrial and toolroom environments by machinists, tool and die makers, and maintenance professionals who need reliable pre-hardened or anneal-state stock to machine and then harden in-shop. At 2 inches by 2 inches in cross section and 36 inches in length, this bar suits applications requiring larger stock removal or the fabrication of multiple smaller tool components from a single bar. It is commonly found in job shops, tool rooms, and production maintenance departments working with low-alloy oil-hardening grades.

Key Features

• AISI Type O1 oil-hardening tool steel for good machinability in the annealed state and wear resistance after hardening
• Thickness tolerance of plus or minus 0.001 inches for precise stock allowance planning
• Length tolerance of plus 0.015 inches, zero minus for predictable cut-to-length yield
• Width tolerance of 0.000 to minus 0.005 inches
• Squareness held to 0.003 inches per inch on all edges
• Full 36-inch length provides ample stock for multiple tool blanks

Compatibility

Designed as a general-purpose O1 oil-hardening flat stock suitable for toolroom machining, die making, punch fabrication, and gauge manufacture where AISI Type O1 tool steel is specified.

Installation Notes

Cutting, grinding, and heat treatment of tool steel should be performed by qualified machinists or toolmakers familiar with O1 oil-hardening procedures. Follow the material supplier heat treat guidelines for austenitizing temperature and oil quench sequence to achieve the intended hardness. Use appropriate personal protective equipment when cutting or grinding. Consult applicable shop safety standards before heat treating or machining.