Starrett 57566 A2 Tool Steel Flat Stock 5/32x3x18 in

Product Description

The STARRETT 57566 is an A2 air-hardening tool steel flat stock bar used in toolmaking, die work, fixture fabrication, and precision machining applications. Measuring 5/32 inch thick, 3 inches wide, and 18 inches long, this flat stock is manufactured to tight dimensional tolerances: +0.010 to 0.015 inches on thickness, width, and squareness, and +0.25 inch on length. A2 tool steel offers excellent wear resistance and dimensional stability during heat treatment, making it a preferred choice for toolmakers and machinists who need consistent stock that holds tolerance through hardening cycles. Weighing 2.38 pounds per piece, this bar ships as a single unit.

This flat stock is suited for fabricating punches, dies, gauges, templates, and other precision tooling components in machine shops, tool-and-die operations, and maintenance shops. The air-hardening A2 grade is selected when distortion during heat treatment must be minimized. It is commonly worked by milling, grinding, and EDM before hardening, then finish-ground to final dimensions after the hardening cycle.

Key Features

• A2 air-hardening tool steel for minimal distortion during heat treatment
• Tight tolerance: +0.010 to 0.015 inches on thickness, width, and squareness
• Length tolerance of +0.25 inch for predictable stock yield
• Flat stock profile ready for milling, grinding, and EDM operations
• Single-piece package quantity with no minimum order beyond one unit

Compatibility

Designed as a general-purpose A2 air-hardening tool steel flat stock suitable for toolmaking, die fabrication, and precision fixture work where controlled distortion during hardening is required.

Installation Notes

Machining and heat treatment of A2 tool steel should be performed by qualified toolmakers or machinists following established shop procedures. All grinding, milling, or EDM operations should be completed before the hardening cycle to reduce finish stock requirements. Follow the material manufacturer's recommended austenitizing and quench parameters for A2 grade; do not substitute a water or oil quench for the air-hardening process. Appropriate personal protective equipment must be worn when cutting, grinding, or heat-treating tool steel stock.