Starrett 54590 A2 Tool Steel Flat Stock 1/8x1-1/4x18 in

Product Description

The STARRETT 54590 is an A2 air-hardening tool steel flat stock bar used in toolmaking, die work, and precision machining applications. It measures 0.125 inches thick, 1.25 inches wide, and 18 inches long, and ships at approximately 0.8 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 similar precision tooling components. Licensed machinists, tool-and-die makers, and industrial maintenance professionals work with this material regularly.

This flat stock is suited for fabricating custom tooling inserts, form dies, blanking punches, and precision fixtures in job shop and manufacturing environments. The air-hardening designation means it can be hardened in still air or with a controlled atmosphere, reducing the risk of distortion compared to oil-hardening grades. Its tight dimensional tolerances make it ready for layout and machining with minimal material removal before hardening. It is appropriate for both short-run prototype tooling and production die components.

Key Features

• AISI A2 air-hardening tool steel for excellent stability during heat treat
• Thickness tolerance of plus or minus 0.001 inches for precise stock sizing
• 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 0.125 inches thick by 1.25 inches wide by 18 inches long

Compatibility

Designed as a general-purpose A2 tool steel flat stock for use in toolmaking, die making, and precision machining applications requiring an air-hardening grade material.

Installation Notes

Cutting and machining of tool steel flat stock should be performed by qualified machinists using appropriate cutting tools and speeds for high-alloy steels. Heat treatment of A2 steel should follow established metallurgical guidelines for austenitizing temperature and air-quench procedures. Always wear appropriate PPE, including eye protection and heat-resistant gloves, when handling stock during or after thermal processing. Consult applicable shop safety standards before cutting or grinding.