Starrett 54048 O1 Tool Steel Flat Stock 3/16x1-3/4x18in

Product Description

The STARRETT 54048 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die work, and precision machining applications. Manufactured to AISI Type O1 specification, this flat bar measures 3/16 inches thick, 1-3/4 inches wide, and 18 inches long, with a weight of 1.68 pounds. Thickness tolerance is held to plus or minus 0.001 inches, making it suitable for applications that require consistent stock removal and predictable hardening response. O1 tool steel is a general-purpose grade that responds well to oil quenching and is widely used by machinists, tool and die makers, and metalworking shops.

This flat stock is intended for use in job shops, toolrooms, and production environments where precision ground or cold-drawn stock is required as a starting point for punches, dies, blades, gauges, and similar tooling components. The 18-inch length provides a practical workable piece for benchtop layout and machining. Sold as a single piece, it is suited for both one-off tooling projects and small-batch production runs where controlled dimensional accuracy is essential.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable heat treat response
• Thickness held to plus or minus 0.001 inches tolerance
• Width tolerance of 0.0000 to 0.0050 inches (negative side only)
• Length tolerance of plus 0.250 inches
• Edge squareness held to 0.003 inches per inch on all edges
• Single-piece packaging with no minimum order beyond one unit

Compatibility

Designed as a standard AISI O1 oil-hardening tool steel flat bar suitable for general toolroom and die-making applications requiring ground or precision-tolerance flat stock.

Installation Notes

Cutting and machining of tool steel flat stock should be performed by a qualified machinist using appropriate metalworking equipment. Eye protection and proper chip guards are required during sawing, milling, or grinding operations. Heat treatment, including oil quenching and tempering, should follow established metallurgical procedures for AISI O1 steel and comply with applicable shop safety standards. Allow the workpiece to reach ambient temperature before taking final measurements to avoid thermal expansion error.