Starrett 57528 A2 Tool Steel Flat Stock 5/16x1/2x18 in

Product Description

The STARRETT 57528 is an A2 air-hardening tool steel flat stock bar used in toolmaking, die work, and precision machining applications. Measuring 0.3125 inches thick, 0.5 inches wide, and 18 inches long, this flat stock is ground to tight dimensional tolerances, making it suitable for fabricating punches, dies, gauges, and other precision tooling components. The A2 grade designation indicates an air-hardening, medium-alloy cold-work tool steel with good wear resistance and dimensional stability through the hardening process. It ships in a ready-to-use condition, typically worked by machinists, tool-and-die makers, and industrial maintenance technicians.

This flat stock is suited for job shops, tool rooms, and maintenance departments that require accurately sized raw material for custom tooling fabrication. Common applications include blanks for cutting tools, forming dies, fixture components, and wear parts. The 18-inch length accommodates most bench and machine work without further breakdown. The air-hardening characteristic of A2 steel reduces distortion during heat treatment compared to oil-hardening grades, which is a practical advantage when dimensional accuracy of the finished part is critical.

Key Features

• A2 air-hardening tool steel for reduced distortion during heat treat
• Thickness tolerance of plus or minus 0.001 inches for precise fit in tooling applications
• Width tolerance of plus 0.000 to 0.005 inches
• Length tolerance of plus 0.250 inches
• Square tolerance of plus or minus 0.001 inches
• Weighs 0.8 pounds per piece

Compatibility

Designed as a general-purpose A2 tool steel flat stock blank for use in toolmaking, die fabrication, and precision machining wherever A2 air-hardening material is specified.

Installation Notes

Cutting, grinding, and heat treatment of tool steel should be performed by qualified machinists or tool-and-die makers using appropriate equipment and personal protective equipment. A2 steel is air-hardened — quenching in oil or water is not required and may cause cracking. Follow the material manufacturer's recommended austenitizing and tempering temperatures for the intended hardness range. Always allow the workpiece to reach ambient temperature before taking final measurements.