Starrett 54070 O1 Tool Steel Flat Stock 1/4x1/2x18 in

Product Description

The STARRETT 54070 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, jig fabrication, and precision machining applications. It measures 0.25 inches thick, 0.5 inches wide, and 18 inches long, weighing 0.64 pounds. The stock ships in an annealed (soft) condition, ready for machining to final form before oil-hardening heat treatment. Thickness tolerance is held to plus or minus 0.001 inches, giving machinists and tool and die makers a tight, reliable starting dimension. Squareness across all edges is maintained at 0.003 per inch. This is a standard-stock precision-ground flat bar intended for professional shop use.

O1 tool steel flat stock is used in machine shops, tool rooms, and fabrication environments wherever a machinable, oil-hardenable steel with predictable heat-treat response is required. Common applications include punches, dies, gauges, cutting tools, and small fixture components. The 18-inch length suits a wide range of bench and mill operations. This material is worked by machinists, tool and die makers, and skilled fabricators using conventional milling, drilling, and grinding equipment prior to hardening.

Key Features

• AISI Type O1 oil-hardening tool steel — predictable hardening response and good dimensional stability after heat treatment
• Thickness tolerance of plus or minus 0.001 inches for consistent stock removal calculations
• Width tolerance of 0.0000 to negative 0.005 inches
• Length tolerance of plus 0.250 inches, minus 0 inches
• Squareness held to 0.003 per inch on all edges
• Ships in annealed condition — fully machinable before hardening

Compatibility

Designed as a standard O1 oil-hardening tool steel flat bar for general toolroom and die shop use where AISI Type O1 material specification is required.

Installation Notes

Machining and heat treatment of tool steel should be performed by qualified machinists or tool and die makers familiar with O1 steel characteristics. Allow adequate stock for grinding after hardening, as minor dimensional changes occur during heat treatment. Follow established shop safety practices when handling freshly hardened or ground steel. Consult the material manufacturer or a heat-treat specialist for specific austenitizing temperature, quench media, and tempering guidelines appropriate to the finished tool geometry.