Starrett 54508 O1 Tool Steel Flat Stock 1x4.5x36 Inches

Product Description

The STARRETT 54508 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 1 inch thick, 4.5 inches wide, and 36 inches long, and weighs 45.9 pounds. It holds a thickness tolerance of plus or minus 0.001 inches, a length tolerance of plus 0.015 inches, and a width tolerance of 0.000 to minus 0.005 inches. Squareness on all edges is held to 0.003 inches per inch. O1 tool steel offers good machinability in the annealed state and responds well to oil quench hardening, making it a standard choice for punches, dies, gauges, and cutting tools.

This flat stock is suited for job shops, tool rooms, and manufacturing facilities that need precision ground tool steel ready for further machining or hardening. It is commonly used to fabricate blanks for punches, die sections, forming tools, and gauge blocks. The 36-inch length provides sufficient stock for multiple part blanks from a single piece. This material ships in annealed condition and must be heat treated before use in hardened tooling applications.

Key Features

• AISI Type O1 oil-hardening tool steel for reliable hardening response with oil quench
• Tight thickness tolerance of plus or minus 0.001 inches for consistent stock removal calculations
• Squareness held to 0.003 inches per inch on all edges
• Width tolerance of 0.000 to minus 0.005 inches supports close-fit blank preparation
• 36-inch length yields multiple blanks per bar in typical toolroom use
• Ships in annealed condition for full machinability prior to heat treat

Compatibility

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

Installation Notes

Machining and heat treatment of O1 tool steel should be performed by qualified toolmakers or machinists familiar with tool steel processing. Always anneal or verify annealed condition before machining. Heat treatment, including hardening and tempering, requires controlled furnace equipment and should follow established metallurgical procedures for AISI O1 specifications. Use appropriate personal protective equipment when cutting, grinding, or handling heavy flat stock.