Starrett 57644 A2 Tool Steel Flat Stock 7/8x5x18 in

Product Description

The STARRETT 57644 is an A2 air-hardening tool steel flat stock bar used in toolmaking, die making, and precision machining applications. Measuring 7/8 inch thick, 5 inches wide, and 18 inches long, this flat stock is manufactured from AISI Type A2 tool steel, a cold-work alloy known for its dimensional stability during heat treatment and good wear resistance after hardening. Thickness, width, and squareness tolerances run +0.010 to 0.015 inches, with a length tolerance of +0.250 inches. Machinists, tool-and-die makers, and metalworking shops stock this material for blanking dies, punches, gauges, and similar precision tooling work.

A2 air-hardening flat stock is suited for applications requiring moderate toughness and high wear resistance in cold-work tooling environments. This bar is commonly used in job shops, tool rooms, and manufacturing facilities where precise, pre-sized stock reduces setup time. The flat ground surface and tight tolerances make it ready for layout and machining without additional squaring. Typical applications include cutting dies, forming tools, trim dies, and wear plates in both production and prototype tooling scenarios.

Key Features

• AISI Type A2 air-hardening tool steel for dimensional stability during heat treat
• Thickness: 7/8 inch with +0.010 to 0.015 inch tolerance
• Width: 5 inches with +0.010 to 0.015 inch tolerance
• Length: 18 inches with +0.250 inch tolerance
• Squareness tolerance held to +0.010 to 0.015 inches
• Single-piece package quantity — no minimum case break required

Compatibility

Designed as a standard pre-sized flat stock blank for use in tool-and-die, machining, and metalworking applications requiring AISI A2 air-hardening tool steel material.

Installation Notes

Cutting and machining of tool steel flat stock should be performed by qualified machinists or tool-and-die makers using appropriate cutting fluids and tooling rated for hardened or pre-hardened steel. Heat treatment of A2 steel requires controlled atmosphere or vacuum furnace equipment to achieve proper hardness — consult the material data sheet for austenitizing and tempering parameters before processing. Always use appropriate personal protective equipment when cutting, grinding, or machining steel bar stock.