Starrett 59140 O1 Tool Steel Flat Stock 1/64x2x36 in

Product Description

The STARRETT 59140 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die work, jig fabrication, and precision machining applications. Manufactured to AISI Type O1 specifications, this flat stock measures 1/64 inch thick, 2 inches wide, and 36 inches long. Thickness and squareness tolerances are held to plus or minus 0.001 inches, making it suitable for work requiring close dimensional control. The bar ships in an unhardened, annealed condition and can be oil-quenched after machining to achieve the hardness required for cutting tools, punches, and wear components. Machinists, tool-and-die makers, and skilled fabricators are the primary users.

O1 tool steel flat stock is used across job shops, maintenance departments, and toolrooms wherever a machinable blank is needed before heat treatment. Common applications include fabricating custom punches, dies, blades, gauges, and wear plates. The 36-inch length and 2-inch width make this bar practical for multiple shorter blanks cut from a single piece. The 1/64-inch thickness suits thin punch blanks, shim stock conversions, and precision flat components where material needs to be finished to a very close final dimension.

Key Features

• AISI Type O1 oil-hardening tool steel — machines cleanly in annealed state, hardens with oil quench
• Thickness held to plus or minus 0.001 inches for close dimensional work
• Width tolerance of 0.000 to minus 0.005 inches for consistent stock sizing
• Length tolerance of plus 0.015 inches, minus 0 inches — full usable length guaranteed
• Edge squareness held to 0.003 inches per inch across all edges
• Single-piece packaging — no minimum multi-bar commitment required

Compatibility

Designed as a standard AISI O1 oil-hardening tool steel flat stock blank suitable for general toolroom, die-making, and precision fabrication applications requiring a thin, wide flat profile before finish machining and heat treatment.

Installation Notes

Cutting and machining of O1 tool steel flat stock should be performed in the annealed condition using appropriate tooling for high-carbon steel. Secure the workpiece firmly before cutting to prevent deflection on thin stock. Heat treatment, including hardening and tempering, should follow established metallurgical procedures for AISI O1 steel and be performed by qualified personnel or a commercial heat treater. Handle finished, hardened pieces carefully — hardened O1 is brittle and susceptible to chipping from impact.