Starrett 54042 O1 Tool Steel Flat Stock 3/16 X 3/16 X 18 in

Product Description

The STARRETT 54042 is an O1 oil-hardening tool steel flat stock bar sized at 3/16 inches thick by 3/16 inches wide by 18 inches long. Manufactured to AISI Type O1 specification, this flat stock is used by machinists, toolmakers, and die makers who need a precision-ground blank ready for layout, grinding, and heat treatment. The thickness tolerance is held to plus or minus 0.001 inches, and the width tolerance runs from 0.000 to 0.005 inches, making it suitable for close-tolerance tooling applications. At 0.18 pounds, it is lightweight and easy to handle on the bench or at a surface grinder.

O1 tool steel flat stock is a standard material in job shops, maintenance departments, and tooling rooms. This bar is appropriate for fabricating punches, dies, cutting tools, gauges, and general-purpose tooling where oil-quench hardening is required. The 18-inch length provides practical stock for single-piece tooling or can be cut down to shorter lengths as the application demands. Edge squareness is held to 0.003 inches per inch across all edges, supporting accurate layout and grinding work.

Key Features

• AISI Type O1 oil-hardening tool steel for consistent hardening response in oil quench
• Thickness tolerance of plus or minus 0.001 inches for close-tolerance tooling blanks
• Width tolerance of 0.000 to 0.005 inches
• Length tolerance of plus 0.250 inches, minus 0 inches
• Edge squareness held to 0.003 inches per inch on all edges
• Compact 0.18-pound weight supports easy bench handling and setup

Compatibility

Designed as a standard O1 oil-hardening tool steel flat stock blank for use in toolmaking, die making, and general machining applications requiring AISI Type O1 material specification.

Installation Notes

Cutting, grinding, and heat treating of tool steel flat stock is typically performed by qualified machinists or toolmakers using appropriate metalworking equipment. Always wear proper personal protective equipment when cutting or grinding tool steel. Follow established shop practices and material safety data sheet guidance when handling tool steel and quench oils. Heat treatment should follow AISI O1 recommended preheat, hardening, and tempering temperature cycles using calibrated equipment.