Starrett 56984 O1 Tool Steel Flat Stock 0.25x5x18 in

Product Description

The STARRETT 56984 is an O1 oil-hardening tool steel flat stock bar sized at 0.25 inches thick, 5 inches wide, and 18 inches long. O1 is an oil-quench tool steel valued for its dimensional stability during hardening, making it a reliable choice for dies, punches, gauges, and precision cutting tools. This flat stock ships in the annealed condition, ready for machining before heat treatment. Squareness is held to 0.003 inches per inch on all edges. Thickness and width tolerances run +0.010 to +0.015 inches. Length tolerance is +0.25 inches. Weighing 6.38 pounds, it suits machine shop, tool-and-die, and maintenance applications where accurate stock sizing is critical.

O1 flat stock at this cross-section is commonly stocked by tool-and-die shops, maintenance machinists, and industrial trades needing a machinable blank for custom tooling. The 5-inch width and 0.25-inch thickness make this bar suitable for fabricating die plates, fixture plates, wear strips, and straight edges. It is intended for shops with access to heat-treating equipment, as the material achieves full hardness only after oil-quench hardening and tempering cycles. This piece is sold and shipped as a single bar.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable heat-treat response
• Thickness and width tolerances of +0.010 to +0.015 inches for close-tolerance blanks
• Edge squareness held to 0.003 inches per inch on all edges
• Annealed condition — fully machinable before hardening
• Single-piece quantity — no minimum bundle requirement
• Length tolerance of +0.25 inches — plan cut allowance accordingly

Compatibility

Designed as a general-purpose O1 tool steel flat stock blank suitable for tool-and-die, punch, gauge, and precision fixture fabrication wherever AISI Type O1 oil-hardening material is specified.

Installation Notes

Machining and fabrication of tool steel should be performed by qualified machinists familiar with AISI O1 material properties. Heat treating — including oil quenching and tempering — must follow established metallurgical procedures appropriate for O1 tool steel; consult a qualified heat-treat facility if in-house capabilities are not available. Always use appropriate personal protective equipment when cutting, grinding, or machining tool steel stock. Inspect bar dimensions against print tolerances before committing to final machining operations.