Starrett 57523 A2 Tool Steel Flat Stock 0.25x0.25x18 in

Product Description

The STARRETT 57523 is an A2 air-hardening tool steel flat stock bar intended for toolmakers, die makers, and machinists who require tight dimensional tolerances in raw stock before heat treatment. Measuring 0.25 inches thick by 0.25 inches wide by 18 inches long, this flat stock is produced to AISI A2 material specification with a thickness tolerance of plus or minus 0.001 inches, a width tolerance of plus 0.000 to 0.005 inches, a length tolerance of plus 0.250 inches, and a squareness tolerance of plus or minus 0.001 inches. At 0.32 pounds, it is sized for bench-scale tooling work where dimensional consistency is critical going into the hardening process.

A2 air-hardening tool steel is a common choice for punches, dies, gauges, and precision tooling components in job shops and manufacturing facilities. The air-hardening characteristic of AISI A2 reduces distortion during heat treatment compared to oil-hardening grades, making it well suited for thin cross-sections and precision profiles. This flat bar stock is supplied in the annealed condition and is intended to be machined to final geometry before hardening and tempering by a qualified heat treater or toolroom professional.

Key Features

• AISI A2 air-hardening tool steel — reduced distortion during heat treat compared to oil-hardening grades
• Thickness tolerance of plus or minus 0.001 inches for consistent stock removal in machining
• Width tolerance of plus 0.000 to 0.005 inches
• Length tolerance of plus 0.250 inches
• Squareness tolerance of plus or minus 0.001 inches
• Compact 18-inch length suitable for small tooling and die components

Compatibility

Designed as a standard AISI A2 air-hardening tool steel flat stock suitable for toolroom, die shop, and precision machining applications requiring tight pre-hardened dimensional tolerances.

Installation Notes

Machining and heat treatment of tool steel flat stock should be performed by qualified toolmakers or machinists following established shop practices. Secure workpieces properly before cutting or grinding, and use appropriate personal protective equipment when working with steel stock. Heat treatment to final hardness should follow the material supplier recommendations for AISI A2 and be performed by personnel experienced with tool steel hardening and tempering procedures.