Starrett 54199 O1 Tool Steel Flat Stock 3/4x8x18 in

Product Description

The STARRETT 54199 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die work, jig fabrication, and precision machining applications. It measures 0.75 inches thick, 8 inches wide, and 18 inches long, and weighs 30.6 pounds. Manufactured to AISI Type O1 specifications, this flat stock ships in a ready-to-machine condition and is intended for hardening through an oil-quench heat treatment process. Machinists, tool-and-die makers, and metalworking professionals use O1 flat stock when they need a material that machines cleanly in the annealed state and achieves high hardness after heat treat. Tight dimensional tolerances are held at the mill to reduce prep time at the bench.

O1 tool steel flat stock in this size range is commonly used in shops producing punches, dies, gauges, cutting tools, and precision fixtures. The 8-inch width and 18-inch length provide sufficient stock for medium to large tooling blanks without requiring a full plate order. This piece is well suited for both prototype and production tooling environments where dimensional consistency and predictable heat-treat response are required.

Key Features

• AISI Type O1 oil-hardening tool steel — machines well in the annealed state and achieves high surface hardness after oil quench
• Thickness tolerance of plus or minus 0.001 inches for consistent stock removal calculations
• Width tolerance of 0.000 to 0.005 inches under nominal for predictable fit in vises and fixtures
• Length tolerance of plus 0.250 inches, minus 0 inches — stock arrives at or above specified length
• Edge squareness held to 0.003 inches per inch across all edges
• Single-piece packaging with a minimum order quantity of 1 for shop flexibility

Compatibility

Designed as a standard AISI Type O1 oil-hardening tool steel flat stock suitable for general toolmaking, die making, and precision machining applications where O1 material specification is required.

Installation Notes

Cutting, grinding, and machining of tool steel flat stock should be performed by qualified machinists or tool-and-die makers using appropriate metalworking equipment. O1 tool steel must be heat treated in a controlled atmosphere or salt bath furnace followed by an oil quench to achieve hardness — follow the material manufacturer heat-treat guidelines for soak temperature and quench procedure. Always wear appropriate PPE when cutting or grinding tool steel. Deburr all edges before handling to avoid injury.