Starrett 57056 O1 Tool Steel Flat Stock 1x1.5x18 in

Product Description

The STARRETT 57056 is an O1 oil-hardening tool steel flat bar used in toolmaking, die making, and precision machining applications. Manufactured to AISI Type O1 specification, this flat stock measures 1 inch thick, 1.5 inches wide, and 18 inches long, with a shipping weight of 7.65 pounds. Thickness and width tolerances are held to +0.0100 to +0.0150 inches, and length tolerance is +0.2500 inches. Edge squareness is controlled to 0.003 inches per inch across all edges. O1 tool steel responds well to oil quench hardening, making it a practical choice for fabricating punches, dies, gauges, and cutting tools that require a reliable hardened working surface.

This flat stock is suited for machine shops, toolrooms, and fabrication environments where close-tolerance raw material is needed before heat treatment. Machinists and tool-and-die makers typically rough-cut and profile this stock prior to hardening. The 18-inch bar length provides practical workpiece sizing for most bench and mill operations. Its AISI O1 designation means it is compatible with standard oil-quench hardening procedures common in industrial toolroom practice.

Key Features

• AISI Type O1 oil-hardening tool steel for reliable hardness response after heat treatment
• Thickness: 1 inch with +0.0100 to +0.0150 inch tolerance
• Width: 1.5 inches with +0.0100 to +0.0150 inch tolerance
• Length: 18 inches with +0.2500 inch tolerance
• Edge squareness held to 0.003 inches per inch on all edges
• Ready for machining, profiling, and heat treatment in toolroom applications

Compatibility

Designed as a standard AISI Type O1 oil-hardening tool steel flat bar suitable for general toolroom, die making, and precision machining stock applications where oil-quench hardening is required.

Installation Notes

Machining and cutting of this stock should be performed prior to the hardening process. Qualified machinists and tool-and-die makers should handle all profiling, drilling, and finishing operations before oil quench. Follow applicable shop safety procedures and equipment manufacturer guidelines when operating mills, saws, and grinders on tool steel. Heat treatment should be carried out by personnel familiar with AISI O1 oil-hardening procedures using properly calibrated furnace equipment.