Starrett 54031 O1 Tool Steel Flat Stock 5/32x1-1/4x18 in

Product Description

The STARRETT 54031 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die work, and precision machining applications. It measures 5/32 inch thick, 1-1/4 inches wide, and 18 inches long, with a thickness tolerance of +/- 0.001 inches and a length tolerance of +0.250 inches. Width tolerance runs from -0.000 to -0.005 inches. The tight dimensional tolerances make this bar suitable for applications where consistent stock removal and predictable heat-treat response are required. It is typically purchased by machinists, tool and die makers, and maintenance shops that machine, grind, and harden their own custom tooling components.

O1 oil-hardening tool steel is a general-purpose cold-work steel well-suited for punches, dies, gauges, blanking tools, and cutting tools that require a good balance of toughness and wear resistance after hardening. This flat stock format allows direct layout, machining, and grinding to finished dimensions before heat treatment. It is commonly used in job shops, toolrooms, and industrial maintenance environments where small-quantity bar stock in ready-to-machine sizes is required. The 18-inch length accommodates a range of short-run tooling blanks from a single piece.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable, controllable heat treatment
• Tight thickness tolerance of +/- 0.001 inches supports precision ground stock applications
• Width tolerance of -0.000 to -0.005 inches provides consistent fit in close-clearance tool setups
• Edge squareness held to 0.003 inches per inch across all edges
• 18-inch length yields multiple tooling blanks from a single bar
• Ready-to-machine flat stock format reduces prep time in the toolroom

Compatibility

Designed as a general-purpose O1 oil-hardening tool steel flat bar suitable for toolroom, die shop, and industrial maintenance applications requiring precision flat stock in this size range.

Installation Notes

Machining and grinding of O1 tool steel should be performed before hardening; heat treatment is typically carried out by a qualified heat-treat technician or tool and die maker following the steel manufacturer's recommended austenitizing and quench procedures. Use appropriate PPE when cutting, grinding, or handling bar stock with sharp edges. Follow applicable shop safety standards when operating machine tools. Store flat stock horizontally on a stable surface to prevent bowing or distortion.