Starrett 54088 O1 Tool Steel Flat Stock 0.25x12x18 in

Product Description

The STARRETT 54088 is an O1 oil-hardening tool steel flat stock blank used in toolmaking, die making, and precision machining applications. Manufactured to AISI Type O1 specification, this flat stock measures 0.25 inches thick, 12 inches wide, and 18 inches long, and weighs approximately 15.3 pounds. Thickness tolerance is held to plus or minus 0.001 inches, giving machinists and toolmakers a consistent starting dimension before hardening. O1 tool steel is a general-purpose oil-hardening grade valued for its machinability in the annealed state and its ability to achieve high hardness after heat treatment.

This flat stock is suited for fabricating punches, dies, gauges, cutting tools, and fixtures in job shops, tool rooms, and manufacturing facilities. The 12-inch width and 18-inch length provide enough material for medium to large tooling blanks, and the pre-toleranced thickness reduces setup time at the surface grinder. Machinists, tool and die makers, and precision fabricators working in both production and prototype environments will find this stock ready to machine and finish grind prior to heat treatment.

Key Features

• AISI Type O1 oil-hardening tool steel — machines cleanly in the annealed state
• Thickness held to plus or minus 0.001 inches for consistent starting dimensions
• Width tolerance of 0.0000 to 0.0150 inches (negative side only)
• Length tolerance of plus 0.250 inches, minus 0 inches
• Edge squareness held to 0.003 inches per inch on all edges
• Single-piece packaging — no minimum order beyond one piece

Compatibility

Designed as a standard O1 oil-hardening flat stock blank for use in tool and die, gauge, fixture, and general precision toolmaking applications requiring AISI Type O1 material specification.

Installation Notes

O1 tool steel flat stock is worked by qualified machinists and tool and die makers using conventional milling, grinding, and EDM equipment. Material should be stress relieved and fully annealed before precision machining where dimensional stability is critical. Heat treatment — including hardening and tempering — should be performed by personnel familiar with AISI O1 procedures; improper quench rates or tempering temperatures will affect final hardness and performance. Always use appropriate personal protective equipment when cutting, grinding, or heat treating tool steel.