Starrett 54476 O1 Tool Steel Flat Stock 3/4 X 3/4 X 36 in

Product Description

The STARRETT 54476 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, and precision machining applications. Manufactured to AISI Type O1 specification, this flat stock measures 0.75 inches thick, 0.75 inches wide, and 36 inches long, weighing 5.74 pounds. Thickness tolerance is held to plus or minus 0.001 inches, making it suitable for close-tolerance work. O1 tool steel is known for its machinability in the annealed state and its ability to achieve high hardness after oil quenching. Machinists, toolmakers, and die makers stock this material for fabricating punches, dies, gauges, and cutting tools.

This flat stock is used in job shops, tool rooms, and production environments where precise, repeatable blanks are required. The 36-inch length provides enough stock to cut multiple blanks from a single piece. The square cross-section with controlled squareness tolerances — edge squareness held to 0.003 inches per inch — makes it ready for layout and machining with minimal prep work. It suits both light-duty prototype tooling and higher-volume die and punch work in metalworking shops.

Key Features

• AISI Type O1 oil-hardening tool steel — machines cleanly in annealed condition, hardens with oil quench
• Thickness and squareness tolerance of plus or minus 0.001 inches for close-tolerance toolmaking
• Width tolerance of 0.000 to 0.005 inches, length tolerance of plus 0.015 inches
• Edge squareness held to 0.003 inches per inch on all edges
• 36-inch length yields multiple blanks per piece for efficient stock use
• Single-piece minimum order quantity for flexibility in low-volume or prototype work

Compatibility

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

Installation Notes

Cutting and machining of tool steel flat stock should be performed by qualified machinists using appropriate metalworking equipment. Always use cutting fluids when sawing or milling to maintain tool life and dimensional accuracy. Heat treatment, including oil quenching and tempering, should follow established metallurgical procedures for AISI O1 tool steel and should be performed by personnel familiar with shop safety requirements for quench operations. Allow material to reach ambient temperature before final inspection to verify dimensional compliance.