Starrett 54053 O1 Tool Steel Flat Stock 3/16 X 4 X 18 in

Product Description

The STARRETT 54053 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, and precision machining applications. Manufactured to AISI Type O1 specifications, this flat stock measures 3/16 inches thick, 4 inches wide, and 18 inches long, with a weight of 3.82 pounds. It holds a thickness tolerance of plus or minus 0.001 inches and a squareness tolerance of 0.003 inches per inch on all edges, making it well suited for applications requiring close dimensional accuracy before heat treatment. Machinists and tool and die makers rely on O1 tool steel for its machinability in the annealed state and its ability to achieve high hardness after oil quenching.

O1 oil-hardening flat stock is a standard material in tool and die shops, mold making, and general precision fabrication. It is used to produce punches, dies, gauges, cutting tools, jigs, and fixtures. This bar is supplied in the annealed condition, ready for machining and finish grinding to final dimensions prior to heat treatment. The 18-inch length provides sufficient stock for most single-component tooling applications. Machinists working in both production and prototype environments rely on this grade for its predictable response to heat treatment and its tight as-supplied tolerances.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable heat-treat response
• Thickness tolerance of plus or minus 0.001 inches for close-tolerance work
• Width tolerance of 0.000 to minus 0.005 inches
• Length tolerance of plus 0.250 inches, minus 0 inches
• Squareness on all edges held to 0.003 inches per inch
• Supplied in annealed condition, ready for machining and grinding

Compatibility

Designed as a standard O1 oil-hardening tool steel flat stock for use in tool and die making, punch and die fabrication, gauge making, and general precision toolroom applications requiring AISI Type O1 material.

Installation Notes

Machining and finishing of O1 tool steel flat stock should be performed in the annealed state prior to heat treatment. Oil quenching for hardening should be carried out by a qualified tool and die maker or heat treatment professional following established metallurgical procedures. Standard metalworking toolroom equipment is used for sawing, milling, and surface grinding. Always wear appropriate PPE when cutting or grinding tool steel, and follow shop safety protocols for handling sharp-edged flat stock.