Starrett 57023 O1 Tool Steel Flat Stock 1/2x4x18 in

Product Description

The STARRETT 57023 is an O1 oil-hardening tool steel flat stock bar measuring 0.5 inches thick, 4 inches wide, and 18 inches long. Manufactured to AISI Type O1 specification, this flat stock is used by machinists, toolmakers, and die makers who need a reliable, machinable steel that responds well to oil quenching during heat treatment. The piece ships in an annealed (soft) condition, allowing it to be machined, ground, and shaped before hardening. Thickness and width tolerances are held to +0.010 to +0.015 inches, and length tolerance is +0.25 inches, making it suitable for precision tooling applications where close stock allowances matter.

This flat stock is suited to job shops, toolrooms, and maintenance machining environments where O1 tool steel is a standard material for punches, dies, gauges, cutting tools, and fixtures. The 0.5 by 4 by 18 inch bar size provides enough cross-section for medium-sized tooling blanks without the waste of larger stock. Its consistent squareness — held to 0.003 inches per inch on all edges — reduces setup time when laying out tooling profiles. Professionals working in general toolmaking, moldmaking, or custom fabrication will find this size practical for a wide range of projects.

Key Features

• AISI Type O1 oil-hardening tool steel — annealed condition for easy machining before heat treat
• Thickness: 0.5 inches with +0.010 to +0.015 inch tolerance
• Width: 4 inches with +0.010 to +0.015 inch tolerance
• Length: 18 inches with +0.25 inch tolerance
• Edge squareness held to 0.003 inches per inch on all edges
• Single-piece packaging with no minimum order beyond one unit

Compatibility

Designed as a standard AISI O1 oil-hardening flat stock blank suitable for general toolroom and die-shop applications requiring oil-quench heat treatment.

Installation Notes

Cutting, grinding, and machining of tool steel flat stock should be performed by qualified machinists or toolmakers using appropriate speeds, feeds, and coolant for the material grade. When heat treating O1 steel, follow established oil-quench procedures for the intended hardness range — consult material data sheets for proper austenitizing temperature and quench guidelines. Wear appropriate PPE when cutting or grinding tool steel. Secure the workpiece firmly before any machining operation.