Starrett 57191 A2 Tool Steel Flat Stock 3/8x3.5x18 in

Product Description

The STARRETT 57191 is an A2 air-hardening tool steel flat stock bar used in toolmaking, die work, and precision machining applications. Manufactured to AISI A2 specification, this flat stock measures 0.375 inches thick, 3.5 inches wide, and 18 inches long, with a shipping weight of 6.69 pounds. A2 tool steel offers good dimensional stability during heat treatment and balanced wear resistance, making it a reliable choice for punches, dies, gauges, and similar components. Machinists and tool-and-die professionals work with this material in both job shop and production environments.

This flat stock is suited for fabricating custom tooling, fixtures, and wear components where air-hardening steel is specified. The 18-inch length provides workable stock for a range of part sizes without excessive waste. The controlled tolerances on all dimensions make it appropriate for precision applications where close fits are required before and after hardening. It is used in both small-shop and industrial toolroom settings.

Key Features

• AISI A2 air-hardening tool steel for good dimensional stability during heat treatment
• Thickness: 0.375 inches with tolerance of +0.010 to 0.015 inches
• Width: 3.5 inches with tolerance of +0.010 to 0.015 inches
• Length: 18 inches with tolerance of +0.25 inches
• Square tolerance: +0.010 to 0.015 inches for consistent cross-section geometry
• Supplied as flat stock bar ready for machining and heat treatment

Compatibility

Designed as standard AISI A2 air-hardening tool steel flat stock compatible with conventional toolroom machining, grinding, and heat-treating processes specified for A2 tool steel.

Installation Notes

Machining and heat treatment of A2 tool steel should be performed by qualified machinists or tool-and-die professionals familiar with tool steel handling procedures. Always follow the steel manufacturer's recommended preheat, hardening, and tempering cycles for AISI A2 material. Use appropriate cutting fluids and feeds during machining to prevent work hardening of the surface. Wear proper PPE when cutting, grinding, or handling flat stock with sharp edges.