Starrett 54431 O1 Tool Steel Flat Stock 7/16x1-1/2x36in

Product Description

The STARRETT 54431 is an O1 oil-hardening tool steel flat bar supplied in an annealed, ready-to-machine condition. Conforming to AISI Type O1 material specification, this flat stock measures 7/16 inches thick, 1-1/2 inches wide, and 36 inches long, and weighs 6.69 pounds per piece. Thickness tolerance is held to plus or minus 0.001 inches, making it suitable for precision toolmaking applications where dimensional consistency is critical before heat treatment. Machinists, tool and die makers, and maintenance professionals rely on this stock for fabricating punches, dies, gauges, jigs, and other hardened tooling components.

O1 tool steel flat stock is used in job shops, tool rooms, and maintenance departments for creating custom tooling that requires a balance of toughness and wear resistance after oil quenching and tempering. The 36-inch length provides enough material to yield multiple blanks from a single piece, reducing setup changes. This size is well suited to applications in both light industrial and precision manufacturing environments where close-tolerance ground stock is specified.

Key Features

• AISI Type O1 oil-hardening tool steel construction for dependable heat-treat response
• Thickness held to plus or minus 0.001 inches for consistent machining stock
• Width tolerance of 0.000 to minus 0.005 inches ensures snug fit in fixture slots
• Length tolerance of plus 0.015 inches provides full usable material on every piece
• Edge squareness held to 0.003 inches per inch across all edges
• 36-inch length yields multiple blanks per bar, reducing material waste

Compatibility

Designed as a general-purpose O1 oil-hardening tool steel flat bar for use in tool and die fabrication, fixture building, and precision machining applications requiring AISI Type O1 material specification.

Installation Notes

Cutting and machining of tool steel flat stock should be performed with appropriate metalworking equipment using coolant to prevent work hardening at cut edges. Heat treatment — including oil quenching and tempering — should be performed by qualified personnel following established metallurgical procedures for AISI O1 tool steel. Wear appropriate PPE when cutting, grinding, or handling this material. Store flat to prevent warping prior to machining.