Starrett 54083 O1 Tool Steel Flat Stock 0.25x5.5x18 in

Product Description

The STARRETT 54083 is an O1 oil-hardening tool steel flat stock bar intended for toolmakers, machinists, and die makers who need a reliable, machinable blank for cutting tools, punches, dies, gauges, and similar toolroom applications. Manufactured to AISI Type O1 specification, this flat stock measures 0.25 inches thick, 5.5 inches wide, and 18 inches long, and weighs 7.02 pounds. Thickness tolerance is held to plus or minus 0.001 inches, giving fabricators a predictable starting point before heat treatment. O1 is a general-purpose oil-hardening grade known for good machinability in the annealed state and consistent response to hardening.

This flat stock is suited for toolroom and job shop use in both production and prototype environments. It is a standard choice for fabricating small dies, fixture components, straight edges, and form tools where dimensional accuracy before hardening is critical. The 18-inch length and 5.5-inch width provide enough material to yield multiple smaller tool blanks from a single piece. Metalworkers and tool-and-die shops will find this stock ready for sawing, milling, and grinding prior to oil-quench hardening.

Key Features

• AISI Type O1 oil-hardening tool steel — consistent hardening response with oil quench
• Thickness tolerance of plus or minus 0.001 inches for precise pre-hardening stock removal planning
• Width tolerance of 0.000 to minus 0.005 inches for predictable fit in fixture setups
• Length tolerance of plus 0.25 inches, minus 0 inches — stock never comes up short
• Edge squareness held to 0.003 inches per inch on all edges
• Single-piece minimum order quantity — no forced multi-pack purchasing

Compatibility

Designed as a standard AISI O1 oil-hardening tool steel flat stock suitable for general toolroom fabrication of dies, punches, gauges, and tool blanks requiring oil-quench heat treatment.

Installation Notes

Machining and grinding of O1 tool steel flat stock should be performed in the annealed condition before heat treatment. Follow standard toolroom safety practices when sawing or milling: secure the workpiece firmly and use appropriate cutting fluids. Heat treatment including hardening and tempering should be performed by qualified personnel following established metallurgical procedures for AISI O1 oil-hardening steel. Allow the part to reach ambient temperature before final grinding to finished dimensions.