Starrett 54677 A2 Tool Steel Flat Stock 5/8x3x36 in

Product Description

The STARRETT 54677 is an A2 air-hardening tool steel flat stock bar intended for toolmakers, die makers, and machinists who require tight dimensional tolerances right off the shelf. Measuring 0.625 inches thick, 3 inches wide, and 36 inches long, this bar is held to a thickness tolerance of plus or minus 0.001 inches, a width tolerance of plus 0.000 to 0.005 inches, and a length tolerance of plus 0.25 inches. Squareness is controlled to 0.003 inches per inch on all edges. At 21.99 pounds, the bar ships as a single piece and is ready for layout, machining, and subsequent heat treatment in a shop or tool room environment.

A2 tool steel flat stock at this cross-section is commonly used to fabricate punches, dies, cutting tools, gauges, and fixtures that will be hardened after rough machining. The air-hardening characteristic of A2 minimizes distortion during the hardening cycle compared to oil-hardening grades, making it a preferred choice where dimensional stability after heat treat is critical. This bar is suited for tool rooms, job shops, and maintenance departments working on medium-to-high production tooling.

Key Features

• A2 air-hardening tool steel per AISI designation — minimizes distortion during heat treatment
• Thickness tolerance of plus or minus 0.001 inches for precise pre-machined fits
• Width tolerance of plus 0.000 to 0.005 inches held across the full 3-inch width
• Squareness controlled to 0.003 inches per inch on all edges for reliable reference surfaces
• Single 36-inch length ships as one piece — no joining or splicing required
• UNSPSC Code 31231200 for procurement and cataloging compliance

Compatibility

Designed as a general-purpose A2 air-hardening tool steel flat bar for use in tool and die fabrication, fixture building, and precision machining applications where subsequent hardening is required.

Installation Notes

Cutting and machining of tool steel flat stock should be performed by qualified machinists using appropriate coolant and carbide or high-speed tooling. Heat treatment, including hardening and tempering of A2 steel, must be performed by a qualified heat treater following established metallurgical procedures for AISI A2 tool steel. Always wear appropriate PPE when cutting, grinding, or handling bar stock. Secure the workpiece properly before any machining operation to prevent movement.