Starrett 54037 O1 Tool Steel Flat Stock 5/32x3.5x18in

Product Description

The STARRETT 54037 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die work, jig fabrication, and precision machining applications. Manufactured to AISI Type O1 specification, this flat stock measures 5/32 inches thick, 3-1/2 inches wide, and 18 inches long, weighing 2.79 pounds. O1 tool steel offers excellent machinability in the annealed state and responds well to oil-quench hardening, making it a go-to material for punches, dies, gauges, and cutting tools. Thickness tolerance is held to plus or minus 0.001 inches, supporting tight-tolerance work straight from stock.

This flat stock is suited for machine shops, tool-and-die operations, and maintenance facilities requiring pre-sized tool steel ready for layout, machining, and heat treatment. The 18-inch length provides practical blank sizes for a wide range of tooling applications without excess material waste. Machinists, toolmakers, and die makers working in both job-shop and production environments commonly stock this profile for on-demand fabrication.

Key Features

• AISI Type O1 oil-hardening tool steel for excellent machinability and hardening response
• Thickness held to plus or minus 0.001 inches for precise stock removal planning
• Width tolerance of 0.0000 to 0.0050 inches (minus 0 / minus 0.005 inches)
• Length tolerance of plus 0.250 inches / minus 0 inches
• Edge squareness: all edges held to 0.003 inches per inch
• Single-piece packaging — no minimum bundle commitment

Compatibility

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

Installation Notes

Cutting, grinding, and machining of tool steel flat stock should be performed by qualified machinists or toolmakers using appropriate carbide or high-speed steel tooling. Always anneal or verify annealed condition before heavy machining. Heat treatment — including oil quenching and tempering — should follow established metallurgical procedures for AISI O1 tool steel and be performed by personnel familiar with proper hardening protocols. Use appropriate personal protective equipment when cutting or grinding.