Starrett 57520 A2 Tool Steel Flat Stock 3/16x1-3/4x18 in

Product Description

The STARRETT 57520 is an A2 air-hardening tool steel flat stock bar used in toolmaking, die work, and precision machining applications. Manufactured to AISI A2 material specification, this flat stock measures 3/16 inches thick, 1-3/4 inches wide, and 18 inches long, weighing 1.67 pounds. A2 tool steel offers good dimensional stability during heat treat and resists distortion better than oil-hardening grades, making it a reliable choice for punches, dies, gauges, and forming tools. Thickness and squareness tolerances are held to plus or minus 0.001 inches, supporting accurate layout and machining before hardening.

This flat stock is suited for job shops, tool and die makers, and maintenance machinists working on press tooling, fixtures, and precision blanks. The 18-inch length provides a practical starting cut for a wide range of tooling applications. Width tolerance is held to plus 0.000 to 0.005 inches, and length tolerance is plus 0.250 inches, consistent with standard stock allowances that leave material for finishing. It is sold individually with a minimum order quantity of one piece.

Key Features

• AISI A2 air-hardening tool steel for dimensional stability during heat treatment
• Thickness tolerance of plus or minus 0.001 inches for consistent stock removal
• 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
• Ready-to-machine flat stock at 3/16 x 1-3/4 x 18 inches

Compatibility

Designed as a standard A2 air-hardening tool steel flat stock suitable for toolmaking, die making, and precision fixture fabrication applications requiring controlled tolerances and predictable heat-treat response.

Installation Notes

Cutting, grinding, and heat treatment of A2 tool steel should be performed by qualified machinists or tool and die makers familiar with hardening and tempering procedures. Always use appropriate personal protective equipment when sawing, grinding, or handling tool steel stock. Consult a heat-treat reference or the material manufacturer for austenitizing and tempering temperature ranges before processing. Secure the workpiece properly during machining operations to maintain dimensional accuracy.