Starrett 57043 O1 Tool Steel Flat Stock 3/4x1x18 in

Product Description

The STARRETT 57043 is an O1 oil-hardening tool steel flat stock bar measuring 0.75 inches thick, 1 inch wide, and 18 inches long. O1 tool steel is a general-purpose oil-hardening grade known for its dimensional stability during heat treatment, good machinability in the annealed state, and ability to hold a sharp cutting edge after hardening. This stock is supplied in the annealed condition, ready for machining to final dimensions before hardening. It is used by tool and die makers, machinists, and skilled tradespeople who fabricate punches, dies, gauges, blades, and similar precision tooling components.

This flat stock suits job shop and toolroom environments where close-tolerance blanks are needed for custom tooling fabrication. The controlled thickness tolerance of plus 0.010 to 0.015 inches and width tolerance of plus 0.010 to 0.015 inches make it a reliable starting blank for components requiring finish grinding to final size. Edge squareness is held to 0.003 inches per inch, supporting accurate layout and setup work.

Key Features

• O1 oil-hardening tool steel (AISI Type O1) for stable, predictable heat treatment response
• Thickness: 0.75 inches with tolerance of plus 0.010 to 0.015 inches
• Width: 1 inch with tolerance of plus 0.010 to 0.015 inches
• Length: 18 inches with plus 0.25-inch length tolerance
• Edge squareness: 0.003 inches per inch on all edges
• Supplied annealed for ease of machining prior to hardening

Compatibility

Designed as a general-purpose O1 tool steel flat stock blank suitable for fabricating punches, dies, gauges, blades, and other precision tooling components in toolroom and job shop applications.

Installation Notes

Machining of O1 tool steel flat stock should be performed in the annealed condition using appropriate cutting tools and feeds for tool steel. Heat treatment, including oil hardening and tempering, should be performed by or under the supervision of a qualified heat treater following established metallurgical procedures for AISI O1 tool steel. Always use appropriate personal protective equipment when grinding, cutting, or heat treating tool steel. Handle with care to avoid nicks or surface damage that can lead to stress concentrations after hardening.