Starrett 53935 O1 Tool Steel Flat Stock 1/32x1x18 in

Product Description

The STARRETT 53935 is an O1 oil-hardening tool steel flat stock bar intended for toolmakers, machinists, and die makers who need a precision-ground, ready-to-harden blank. Manufactured to AISI Type O1 specification, this flat stock measures 1/32 inch thick, 1 inch wide, and 18 inches long, with a thickness tolerance of plus or minus 0.001 inches. O1 tool steel is a general-purpose oil-hardening grade prized for its dimensional stability during heat treatment and its ability to hold a sharp cutting edge after hardening and tempering. The bar ships in a soft, machinable state, allowing it to be cut, drilled, or ground to final shape before heat treatment.

This flat stock is suited for fabricating punches, dies, gauges, blades, and small tools in both job-shop and production environments. The 1/32-inch thickness makes it a practical choice for thin shim-style tooling blanks, wear plates, and precision spacers. Machinists and tool-and-die trades working in shops with heat-treating capability will find this bar ready to machine and finish-grind prior to the oil-quench hardening cycle.

Key Features

• AISI Type O1 oil-hardening tool steel — general-purpose grade with good wear resistance after hardening
• Thickness tolerance of plus or minus 0.001 inches for precise blank stock
• Width tolerance of 0.000 to minus 0.005 inches
• Length tolerance of plus 0.250 inches
• Edge squareness held to 0.003 inches per inch across all edges
• Soft (annealed) condition as supplied — machinable before heat treatment

Compatibility

Designed as a standard O1 oil-hardening tool steel flat stock blank suitable for general toolmaking, die making, and precision machining applications requiring a thin, wide flat bar in annealed condition.

Installation Notes

Machining and grinding of O1 tool steel should be completed before the hardening cycle. Heat treatment requires oil quenching and is typically performed by a qualified heat treater or in-shop furnace following established AISI O1 hardening procedures. Use appropriate personal protective equipment and ventilation during any cutting, grinding, or heat-treating operations. Consult applicable shop safety standards and material data sheets before processing.