Starrett 54459 O1 Tool Steel Flat Stock 9/16x1.5x36 in

Product Description

The STARRETT 54459 is an O1 oil-hardening tool steel flat stock bar suited for toolmakers, machinists, and die makers who need a precision-ground blank ready for custom shaping, jig fabrication, or tooling applications. Manufactured to AISI Type O1 specification, it measures 9/16 inches thick, 1-1/2 inches wide, and 36 inches long. Thickness and squareness tolerances are held to plus or minus 0.001 inches, making it appropriate for applications where dimensional consistency before and after hardening is critical. At 8.61 pounds, this is a solid, full-length bar intended for bench stock or production use.

O1 tool steel flat stock is a standard material in machine shops, tool rooms, and fabrication environments. It is commonly used to produce punches, dies, gauges, fixtures, and cutting tools. The oil-hardening grade is favored where dimensional stability during heat treatment is important and where moderate toughness is needed alongside good wear resistance. Machinists and toolmakers typically cut, drill, mill, and grind this stock to final size before hardening and tempering to the target application hardness.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable heat-treat response and dimensional stability
• Thickness tolerance of plus or minus 0.001 inches for precision fitment in close-tolerance tooling work
• Width tolerance of 0.000 to minus 0.005 inches for consistent stock sizing
• Length tolerance of plus 0.015 inches to ensure full usable length
• Edge squareness held to 0.003 inches per inch across all edges
• Full 36-inch bar length provides flexibility for multiple cuts or single long-run tooling blanks

Compatibility

Designed as a general-purpose O1 oil-hardening tool steel flat stock suitable for machine shop, tool room, and die-making applications requiring AISI Type O1 material specification.

Installation Notes

Cutting, drilling, and grinding should be performed by a qualified machinist using appropriate tooling for tool steel hardness. Heat treatment — hardening and tempering — should follow established AISI O1 guidelines and be performed by personnel familiar with tool steel metallurgy. Secure the workpiece properly in a vise or fixture before machining to prevent movement. Allow the steel to reach ambient temperature before taking final dimensional measurements.