Starrett 54503 O1 Tool Steel Flat Stock 1x2x36 in

Product Description

The STARRETT 54503 is an O1 oil-hardening tool steel flat stock bar used in precision toolmaking, die making, jig construction, and general metalworking applications. Manufactured to AISI Type O1 material specification, this flat stock measures 1 inch thick by 2 inches wide by 36 inches long and weighs 20.4 pounds. Thickness tolerance is held to +/- 0.001 inches, making it suitable for applications where dimensional accuracy is critical before and after heat treatment. Machinists and tool-and-die makers select O1 stock for its predictable oil-quench hardening response and good wear resistance in finished tooling.

O1 tool steel flat stock is a shop staple for fabricating punches, dies, gauges, bushings, and cutting tools in both job shop and production environments. The 36-inch length allows multiple blanks to be cut from a single piece, reducing material waste. This size is well suited to manual mills, surface grinders, and band saws commonly found in machine shops. The stock is supplied in the annealed condition, ready for rough machining prior to hardening and tempering by a licensed machinist or heat-treat professional.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable heat-treat response
• Thickness held to +/- 0.001 inches for precision blanking
• Width tolerance: 0.000 to -0.005 inches
• Length tolerance: +0.015 inches
• Squareness: edge squareness all faces 0.003 inches per inch
• 36-inch length yields multiple blanks from a single bar

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

Cutting, grinding, and machining of tool steel flat stock should be performed by qualified machinists using appropriate cutting fluids and personal protective equipment. Heat treatment — including hardening and tempering — must follow established metallurgical procedures for AISI O1 tool steel and should be carried out by personnel trained in heat-treat operations. Secure the workpiece firmly before any cutting or grinding operation. Always allow the bar to reach ambient temperature before taking precision measurements.