Starrett 57170 A2 Tool Steel Flat Stock 0.25x1.25x18 in

Product Description

The STARRETT 57170 is an A2 air-hardening tool steel flat stock blank used in toolmaking, die making, and precision machining applications. Manufactured to AISI A2 specification, this flat stock measures 0.25 inches thick, 1.25 inches wide, and 18 inches long, weighing 1.59 pounds. A2 tool steel is known for its excellent dimensional stability during heat treatment and good wear resistance after hardening, making it a reliable choice for punches, dies, gauges, and cutting tools. Machinists and tool and die makers rely on stock like this for fabricating custom tooling to tight tolerances.

This flat stock is suited for shop-floor and toolroom use in both job shop and production environments. The pre-cut 18-inch length allows efficient layout and minimal material waste when machining shorter tool blanks. The +0.010 to 0.015 inch thickness, width, and square tolerances provide consistent stock dimensions that simplify setup. A length tolerance of +0.25 inch is standard for this product type. It is appropriate for applications requiring moderate to high wear resistance combined with good toughness, including cold-work tooling made from A2 tool steel.

Key Features

• AISI A2 air-hardening tool steel for stable, predictable heat treatment
• Thickness: 0.25 inches with +0.010 to 0.015 inch tolerance
• Width: 1.25 inches with +0.010 to 0.015 inch tolerance
• Length: 18 inches with +0.25 inch tolerance
• Square tolerance: +0.010 to 0.015 inch for consistent flatness and squareness
• Ready-to-machine flat stock at 1.59 pounds

Compatibility

Designed as a standard A2 tool steel flat stock blank suitable for toolroom fabrication of punches, dies, gauges, and other cold-work tooling components requiring air-hardening steel.

Installation Notes

Machining and heat treatment of A2 tool steel should be performed by qualified tool and die makers or machinists familiar with cold-work tool steel handling. Always use appropriate cutting fluids and speeds when machining to prevent work hardening at cut edges. Heat treatment, including hardening and tempering, should follow established procedures for AISI A2 steel and be performed in controlled atmosphere or vacuum furnaces where applicable. Allow the workpiece to reach ambient temperature before precision grinding after heat treatment.