Starrett 54101 O1 Tool Steel Flat Stock 5/16x5/16x18 in

Product Description

The STARRETT 54101 is an O1 oil-hardening tool steel flat stock bar intended for toolmakers, machinists, and die makers who need a reliable, machinable steel blank in the annealed condition. Manufactured to AISI Type O1 specification, this flat stock measures 5/16 inches thick by 5/16 inches wide by 18 inches long and holds a thickness tolerance of plus or minus 0.001 inches. O1 tool steel is widely used where good machinability in the soft state and predictable through-hardening in an oil quench are required. The piece weighs approximately 0.5 pounds.

This flat stock is suited for fabricating punches, dies, gauges, cutting tools, jigs, and fixtures in job shops, tool rooms, and production machine shops. The 18-inch length provides enough material for most single-piece tooling applications. Because it ships in the annealed state, it can be machined, ground, and shaped to final form before hardening. Machinists working on precision tooling regularly stock O1 flat bar in standard cross-section sizes like this 5/16-inch square profile for low-volume and prototype work.

Key Features

• AISI Type O1 oil-hardening tool steel in the annealed condition for full machinability before heat treatment
• Thickness tolerance of plus or minus 0.001 inches for close-tolerance layout work
• Width tolerance of 0.0000 to 0.0050 inches negative from nominal
• Length tolerance of plus 0.250 inches from nominal 18 inches
• Squareness held to 0.003 inches per inch on all edges
• Single-piece package quantity suits low-volume toolroom and prototype use

Compatibility

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

Installation Notes

O1 tool steel flat stock is typically cut, milled, and ground by machinists or toolmakers using conventional machine shop equipment. Follow your shop's established procedures for tool steel heat treatment, including proper soak temperatures and oil quench media, when hardening the finished part. Wear appropriate personal protective equipment when cutting or grinding tool steel. Consult applicable material safety and shop safety standards before performing heat treatment operations.