Starrett 57166 A2 Tool Steel Flat Stock 3/16x2-1/2x18 in

Product Description

The STARRETT 57166 is an A2 air-hardening tool steel flat stock blank used in toolmaking, die work, punch fabrication, and precision machining applications. It measures 3/16 inch thick, 2-1/2 inches wide, and 18 inches long, with a shipping weight of 2.4 pounds. A2 tool steel offers good dimensional stability during heat treatment and solid wear resistance, making it a reliable choice for cutting tools, blanking dies, and form tooling. This stock arrives in an annealed condition ready for machining prior to hardening. Machinists, tool and die makers, and maintenance shops are the primary users of this material.

This flat stock is suited for shop and industrial use where a medium-alloy, air-hardening tool steel is specified. Common applications include fabricating custom punches, dies, gauges, and fixtures. The 18-inch length provides sufficient stock for a range of tooling layouts, and the 3/16-inch thickness suits thin-profile die components and blades. It is appropriate for both one-off toolroom jobs and small-batch production setups.

Key Features

• A2 air-hardening tool steel (AISI Type A2) for stable, low-distortion heat treatment
• Thickness: 3/16 inch with a tolerance of +0.010 to +0.015 inches
• Width: 2-1/2 inches with a tolerance of +0.010 to +0.015 inches
• Length: 18 inches with a tolerance of +0.25 inches
• Square tolerance: +0.010 to +0.015 inches for consistent cross-section geometry
• Supplied in annealed condition, ready for machining and subsequent hardening

Compatibility

Designed as a standard A2 tool steel flat stock blank for use in toolroom, die shop, and precision machining environments where AISI A2 air-hardening material is specified.

Installation Notes

Machining and heat treatment of tool steel should be performed by qualified toolmakers or machinists familiar with A2 steel specifications. All grinding, milling, and EDM operations should be completed before hardening and tempering. Follow the material manufacturer's recommended heat treatment cycle for A2 steel. Proper personal protective equipment, including eye and hand protection, is required when cutting or grinding tool steel stock.