Starrett 54555 A2 Tool Steel Flat Stock 0.125x5x36 in

Product Description

The STARRETT 54555 is an A2 air-hardening tool steel flat stock bar intended for toolmakers, machinists, and die makers who require tight dimensional tolerances straight from the supplier. The bar measures 0.125 inches thick, 5 inches wide, and 36 inches long, with 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 held to 0.003 inches per inch on all edges. At 7.33 pounds per bar, the stock ships ready for layout, rough machining, and heat treatment.

A2 tool steel is a general-purpose air-hardening grade commonly used for punches, dies, gauges, jigs, and cutting tools in production and toolroom environments. This flat stock format suits applications where a bar is cut to length and then machined or ground to final dimension before hardening. The air-hardening characteristic of A2 reduces distortion during heat treatment compared to oil-hardening grades, making it a preferred choice when dimensional stability after hardening is critical. This size is well suited to medium and large die components, precision fixtures, and wear plates.

Key Features

• AISI A2 air-hardening tool steel for reduced distortion during heat treat
• Thickness tolerance held to plus or minus 0.001 inches
• Width tolerance of plus 0.000 to 0.005 inches for consistent fits
• Squareness of 0.003 inches per inch on all edges
• 36-inch bar length with plus 0.25-inch length tolerance
• 7.33-pound bar weight suitable for medium to large tooling blanks

Compatibility

Designed as an OEM-style flat stock replacement and toolroom supply for applications requiring AISI A2 air-hardening tool steel in 0.125-inch by 5-inch cross-section.

Installation Notes

Cutting, grinding, and machining of tool steel flat stock should be performed by qualified machinists or toolmakers using appropriate metalworking equipment. Follow established heat treatment procedures for A2 tool steel, including proper austenitizing temperature ranges and controlled cooling, per your shop or metallurgical guidelines. Always wear appropriate PPE when cutting or grinding tool steel. Rough machine to near-net shape before hardening to minimize post-heat-treat grinding.