Starrett 56974 O1 Tool Steel Flat Stock 0.25x1x18 in

Product Description

The STARRETT 56974 is a precision-ground flat stock bar made from AISI Type O1 oil-hardening tool steel. It measures 0.25 inches thick, 1 inch wide, and 18 inches long, and weighs approximately 1.28 pounds. O1 tool steel is a versatile, carbon-manganese alloy widely used for tooling, dies, punches, gauges, and precision mechanical components. It machines well in the annealed state and responds consistently to oil-quench hardening. Thickness and width tolerances are held to +0.0100 to +0.0150 inches. Length tolerance is +0.2500 inches. Edge squareness is held to 0.003 inches per inch of height, making this stock suitable for applications where flat and square stock is critical before hardening operations begin.

This flat stock is used in machine shops, tool rooms, and fabrication environments where precision raw material is required for custom tooling manufacture. Typical applications include blanks for punches, forming dies, fixture components, wear plates, and small structural tooling elements. It is sold in single-piece quantity and is intended for professional machinists, tool-and-die makers, and maintenance technicians who need a reliable, dimensionally consistent starting material for subsequent machining and heat treatment.

Key Features

• AISI Type O1 oil-hardening tool steel for consistent hardening response in oil-quench heat treatment
• Precision-ground flat stock: 0.25 inches thick x 1 inch wide x 18 inches long
• Thickness and width tolerances held to +0.0100 to +0.0150 inches for dimensional consistency
• Edge squareness held to 0.003 inches per inch — suitable for precision tooling blanks
• Length tolerance +0.2500 inches — stock can be cut to final length after receipt
• Single-piece packaging with no minimum order beyond one unit

Compatibility

Designed as a general-purpose O1 oil-hardening tool steel flat stock blank for use in machine shop and tool room applications requiring AISI Type O1 material specification.

Installation Notes

This product is raw stock material worked by machinists and tool-and-die makers using conventional machining equipment such as mills, surface grinders, and band saws. All cutting, grinding, and heat treatment operations should be performed by qualified personnel following applicable shop safety practices. Oil-quench hardening should be performed in accordance with standard procedures for AISI Type O1 tool steel, including proper pre-heat, soak, and quench sequencing. Handle ground stock edges with care, as precision-ground surfaces can be sharp.