Starrett 54057 O1 Tool Steel Flat Stock 3/16x10x18 in

Product Description

The STARRETT 54057 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, and precision machining applications. Manufactured to AISI Type O1 material specification, this flat stock measures 3/16 inches thick, 10 inches wide, and 18 inches long, with a weight of 9.56 pounds. Thickness tolerance is held to plus or minus 0.001 inches, making it suitable for applications where dimensional accuracy before hardening is critical. Machinists, toolmakers, and die shops rely on O1 flat stock for its predictable oil-quench hardening behavior and good machinability in the annealed state.

This flat stock is used in the fabrication of punches, dies, gauges, jigs, fixtures, and cutting tools across job shops, tool and die operations, and production machine shops. The 10-inch width and 18-inch length provide sufficient material for medium to large tool components without requiring initial saw reduction. O1 tool steel is a general-purpose grade well suited to applications that do not demand the elevated red-hardness or wear resistance of higher-alloy grades. It is commonly stocked and worked in annealed condition, then hardened and tempered to the desired service hardness by qualified heat-treat operations.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable, controlled hardening response
• Thickness tolerance of plus or minus 0.001 inches for tight pre-hardening dimensional control
• Width tolerance of 0.000 to minus 0.015 inches ensuring parts fall within undersized envelope
• Length tolerance of plus 0.250 inches providing adequate saw allowance
• Edge squareness held to 0.003 inches per inch on all edges
• Ships as a single piece at 9.56 pounds

Compatibility

Designed as a standard AISI O1 oil-hardening tool steel flat bar suitable for general toolmaking, die making, and precision fixture fabrication where O1 grade flat stock at this size is specified.

Installation Notes

O1 tool steel flat stock is worked by qualified machinists and toolmakers using conventional milling, grinding, and sawing equipment appropriate for tool steel. Material should be handled in the annealed condition during machining. Heat treating to final hardness requires oil quenching per AISI O1 procedures and should be performed by personnel familiar with tool steel heat treatment to avoid cracking or distortion. Always use appropriate personal protective equipment when cutting or grinding tool steel.