Starrett 54156 O1 Tool Steel Flat Stock 0.5x3.5x18 in

Product Description

The STARRETT 54156 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 0.5 inches thick, 3.5 inches wide, and 18 inches long, and weighs 8.93 pounds. O1 tool steel is known for its excellent machinability in the annealed state and its ability to achieve high hardness after oil quenching. Thickness tolerance is held to plus or minus 0.001 inches, making this stock suitable for applications where close dimensional control is required before heat treatment. It is typically stocked in the soft, annealed condition and ready for machining prior to hardening.

This flat stock is suited for fabricating punches, dies, gauges, jigs, fixtures, and cutting tools in job shops, tool rooms, and industrial maintenance environments. The 18-inch length provides enough material for most single-piece tooling applications. Machinists, tool and die makers, and maintenance technicians working in manufacturing or fabrication settings are the primary users of this product. The combination of width and thickness makes it practical for blanking dies, form tools, and wear plates that require post-machining heat treatment.

Key Features

• AISI Type O1 oil-hardening tool steel in flat bar form, supplied in annealed condition
• Thickness tolerance of plus or minus 0.001 inches for close-tolerance machining applications
• Width tolerance of 0.0000 to minus 0.005 inches
• Length tolerance of plus 0.250 inches
• Squareness held to 0.003 inches per inch on all edges
• Dimensions: 0.5 inches thick, 3.5 inches wide, 18 inches long

Compatibility

Designed as a standard AISI O1 oil-hardening tool steel flat stock suitable for general toolmaking, die work, and precision fixture fabrication where oil-quench heat treatment will be applied.

Installation Notes

This material is machined in the annealed state before heat treatment. Machinists and tool and die makers should follow standard tool steel machining practices and use appropriate cutting fluids. Heat treatment to final hardness should be performed by a qualified heat treater following established AISI O1 oil-quench procedures. Wear appropriate PPE when cutting, grinding, or handling raw stock.