Starrett 54258 O1 Tool Steel Flat Stock 1/16x3/4x36 in

Product Description

The STARRETT 54258 is an O1 oil-hardening tool steel flat stock bar, ground to close tolerances for toolmaking, jig building, die work, and precision machining applications. It is manufactured from AISI Type O1 oil-hardening tool steel and measures 1/16 inch thick, 3/4 inch wide, and 36 inches long. Thickness tolerance is held to plus or minus 0.001 inches, giving machinists and tool and die makers a reliable, ready-to-use starting blank that requires minimal stock removal. At 0.48 pounds per piece, it ships as a single bar with a minimum order quantity of one.

This flat stock is suited for fabricating punches, dies, gauges, form tools, broaches, and similar precision components in tool and die, mold making, and general machine shop environments. The O1 grade responds well to conventional oil-quench heat treatment, making it a practical choice when a shop needs a tough, wear-resistant tool steel that is straightforward to harden without the complexity of high-speed or air-hardening grades. It is used by machinists, tool and die makers, and maintenance technicians working in manufacturing and industrial facilities.

Key Features

• AISI Type O1 oil-hardening tool steel for reliable, controllable heat treatment
• Thickness held to plus or minus 0.001 inches for close-tolerance toolmaking
• Length tolerance of plus 0.015 inches, minus 0 inches ensures full usable length
• Width tolerance of 0.000 to minus 0.005 inches for consistent fit in fixtures
• Edge squareness of 0.003 inches per inch across all edges
• Single-bar packaging with no minimum quantity commitment beyond one piece

Compatibility

Designed as a standard AISI O1 oil-hardening tool steel flat stock suitable for general toolmaking, die making, and precision fabrication applications requiring a ground, close-tolerance blank.

Installation Notes

Cutting, grinding, and machining should be performed by qualified machinists using appropriate tooling for hardened or pre-hardened tool steel stock. Heat treatment, including oil quenching and tempering, should follow established metallurgical procedures for AISI O1 grade steel and be performed by personnel experienced with tool steel processing. Always allow the bar to reach ambient temperature before taking final measurements, as thermal expansion will affect tolerance verification. Wear appropriate PPE when cutting or grinding tool steel.