Starrett 54441 O1 Tool Steel Flat Stock 0.5x1.25x36 in

Product Description

The STARRETT 54441 is an O1 oil-hardening tool steel flat stock bar dimensioned at 0.5 inches thick, 1.25 inches wide, and 36 inches long. Made to AISI Type O1 specifications, this flat stock is produced from tool steel known for its consistent hardening response, good machinability in the annealed state, and dimensional stability through the heat-treat process. Tight tolerances are held across all three axes, making it suitable for toolmakers, die makers, and machinists who need reliable pre-stock for punches, dies, gauges, and custom tooling. The bar weighs approximately 6.37 pounds.

O1 tool steel flat stock in this size range is a standard raw material for tool and die shops, machine shops, and maintenance departments in manufacturing facilities. It is used to fabricate cutting tools, forming dies, jigs, fixtures, and precision wear components. The 36-inch length allows multiple blanks to be cut from a single bar, reducing material waste during layout and sawing operations. This stock is typically used in the annealed condition and hardened after final machining.

Key Features

• AISI Type O1 oil-hardening tool steel — consistent hardening response with minimal distortion
• Thickness tolerance of plus or minus 0.001 inches for close-tolerance tooling applications
• Width tolerance of 0.000 to minus 0.005 inches for predictable fit in milled pockets and fixtures
• Length tolerance of plus 0.015 inches, allowing clean cut-to-length operations
• Edge squareness held to 0.003 inches per inch on all edges
• 36-inch bar length yields multiple blanks per piece, reducing raw material cost per part

Compatibility

Designed as a general-purpose O1 oil-hardening tool steel flat stock suitable for use in tool and die fabrication, gauge making, punch and die sets, and precision fixture components where oil-hardening steel is specified.

Installation Notes

Cutting and machining of tool steel flat stock should be performed by a qualified machinist using appropriate metalworking equipment such as a band saw, surface grinder, or milling machine. The stock is supplied in the annealed state and must be heat treated by a qualified tool and die maker or heat-treat shop to achieve working hardness. Follow the material manufacturer guidelines for proper preheat, austenitizing temperature, and quench media when hardening O1 steel. Always wear appropriate personal protective equipment when cutting, grinding, or handling steel bar stock.