Starrett 54373 O1 Tool Steel Flat Stock 0.25x4.5x36in

Product Description

The STARRETT 54373 is an O1 oil-hardening tool steel flat stock blank used in toolmaking, die making, jig fabrication, and precision machining applications. Manufactured from AISI Type O1 oil-hardening tool steel, this flat stock measures 0.25 inches thick, 4.5 inches wide, and 36 inches long, with a finished weight of 11.48 pounds. Thickness tolerance is held to plus or minus 0.001 inches, making it suitable for applications requiring close dimensional control before heat treatment. Licensed machinists, tool and die makers, and industrial maintenance professionals work with this material when fabricating custom tooling components that will be oil-quench hardened after machining.

This flat stock is suited for fabrication of punches, dies, gauges, forming tools, and similar precision components in job shop, production tooling, and maintenance environments. Its 36-inch length provides enough stock for multiple parts from a single piece. The oil-hardening O1 grade machines well in its annealed state, then responds predictably to heat treatment, making it a standard choice when dimensional stability after hardening is critical to the finished part.

Key Features

• AISI Type O1 oil-hardening tool steel construction for predictable heat-treat response
• Thickness tolerance of plus or minus 0.001 inches for close pre-machining dimensional control
• Length tolerance of plus 0.015 inches, zero minus
• Width tolerance of 0.000 to minus 0.005 inches
• Edge squareness held to 0.003 inches per inch across all edges
• 36-inch length provides flexibility for multiple part yields per piece

Compatibility

Designed as a general-purpose O1 oil-hardening tool steel flat stock for toolmaking, die making, and precision fabrication applications requiring an AISI Type O1 material specification.

Installation Notes

Material arrives in annealed condition and is intended to be machined prior to heat treatment. Sawing, milling, drilling, and surface grinding are performed before oil quenching and tempering. Follow established heat-treatment procedures and applicable shop safety protocols when hardening. Handle with appropriate lifting precautions given the 11.48-pound stock weight.