Starrett 54039 O1 Tool Steel Flat Stock 5/32x5x18 in

Product Description

The STARRETT 54039 is an O1 oil-hardening tool steel flat stock bar used in precision toolmaking, die making, and machining applications. Conforming to AISI Type O1 material specification, this flat stock measures 5/32 inches thick, 5 inches wide, and 18 inches long, and weighs approximately 3.99 pounds. Thickness tolerance is held to plus or minus 0.001 inches, making it suitable for applications that require tight dimensional control before hardening. Machinists and toolmakers rely on O1 tool steel for its predictable oil-quench hardening characteristics and good dimensional stability through heat treatment.

This flat stock is used in the fabrication of cutting tools, punches, dies, gauges, and fixture components in machine shops and tool rooms. The 5-inch width and 18-inch length provide enough material for medium-sized tooling blanks or multiple smaller parts cut from a single piece. Its edge squareness is held to 0.003 inches per inch, supporting accurate layout and machining without additional dressing on all four edges. Typical users include toolmakers, machinists, and die shop professionals working in both production and job-shop environments.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable heat treat response
• Thickness tolerance of plus or minus 0.001 inches for precision fitment
• Width tolerance of 0.000 to 0.005 inches under nominal
• Length tolerance of plus 0.250 inches, minus 0 inches
• Edge squareness held to 0.003 inches per inch on all edges
• Ready-to-machine flat stock format suitable for tooling blanks and die components

Compatibility

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

Installation Notes

Machining and heat treatment of O1 tool steel flat stock should be performed by qualified machinists or toolmakers familiar with tool steel handling procedures. Power down all machine tools and follow standard lockout procedures before securing or changing workpieces. Oil quenching should follow the steel manufacturer guidelines for AISI O1 to avoid distortion or cracking. Wear appropriate personal protective equipment when cutting, grinding, or heat treating tool steel.