Starrett 56982 O1 Tool Steel Flat Stock 0.25x4x18 in

Product Description

The STARRETT 56982 is a precision-ground flat stock bar made from AISI Type O1 oil-hardening tool steel. It measures 0.25 inches thick, 4 inches wide, and 18 inches long, with a shipping weight of 5.1 pounds. O1 tool steel is a carbon-manganese alloy known for consistent hardening response in oil-quench heat treatment, good wear resistance after hardening, and machinability in the annealed state. This stock is used by toolmakers, machinists, and die makers who require tight-tolerance raw material for machining, grinding, or heat-treating into finished tooling components such as dies, punches, gauges, and jigs.

This flat stock is suited for job shops, tool-and-die operations, and maintenance machining environments where precision ground-to-size material reduces setup stock removal. The 0.25-inch thickness and 4-inch width make it practical for small die sections, fixture plates, and wear plates. Because the stock ships in an annealed condition, it can be machined with standard HSS or carbide tooling before oil-hardening heat treatment to final hardness. Edge squareness is held to 0.003 inches per inch across all edges, supporting accurate layout and fixturing directly from stock.

Key Features

• AISI Type O1 oil-hardening tool steel in annealed, ready-to-machine condition
• Thickness: 0.25 inches with a tolerance of +0.0100 to +0.0150 inches
• Width: 4 inches with a tolerance of +0.0100 to +0.0150 inches
• Length: 18 inches with a length tolerance of +0.2500 inches
• Edge squareness held to 0.003 inches per inch on all edges
• Consistent oil-quench hardening response for dies, punches, gauges, and cutting tools

Compatibility

Designed as a general-purpose O1 oil-hardening tool steel flat stock for toolmaking, die-making, and precision machining applications requiring annealed stock that will be hardened after rough machining.

Installation Notes

Cutting, grinding, and machining of tool steel flat stock should be performed by qualified machinists or toolmakers using appropriate metalworking equipment. Secure the workpiece firmly before any cutting or grinding operation. Heat treatment, including oil-quench hardening and tempering, should follow the material specification guidelines for AISI O1 and be performed by qualified personnel with proper equipment to avoid cracking or distortion. Consult applicable shop safety standards when handling tool steel and quench media.