Starrett 53986 O1 Tool Steel Flat Stock 3/32x4x18 in

Product Description

The STARRETT 53986 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, jig and fixture fabrication, and precision machining applications. Manufactured to AISI Type O1 specifications, this flat stock measures 3/32 inches thick, 4 inches wide, and 18 inches long and weighs 1.91 pounds. It ships in the annealed (soft) condition, ready for machining, then can be oil-quench hardened to achieve high surface hardness. Thickness tolerance is held to plus or minus 0.001 inches, making it suitable for close-tolerance toolroom work where dimensional consistency is critical before and after heat treatment.

This flat stock is used in tool and die shops, machine shops, and maintenance departments for fabricating punches, dies, gauges, blades, and custom tooling components. The 4-inch width and 18-inch length provide a workable blank for a wide range of toolroom applications. It is commonly stocked in toolrooms for on-demand machining of replacement tooling components. Machinists, tool and die makers, and maintenance technicians all work with this material regularly in both job-shop and production environments.

Key Features

• AISI Type O1 oil-hardening tool steel — machines well in annealed state and hardens predictably with oil quench
• Thickness tolerance of plus or minus 0.001 inches for consistent stock removal calculations
• Width tolerance of 0.000 to minus 0.005 inches ensures stock is never over nominal width
• Length tolerance of plus 0.250 inches provides extra material for facing and squaring
• Edge squareness held to 0.003 inches per inch across all edges
• Single-piece packaging allows procurement of exact quantities needed for toolroom projects

Compatibility

Designed as a standard AISI O1 oil-hardening tool steel flat bar suitable for general toolroom, die-making, and precision machining applications requiring a machinable, oil-quench-hardenable steel stock in 3/32 x 4 x 18 inch format.

Installation Notes

O1 tool steel flat stock is machined and ground by toolmakers and machinists using standard carbide or HSS tooling in the annealed condition before heat treatment. Heat treating should be performed by qualified personnel following established AISI O1 hardening procedures, including proper preheat, austenitizing, and oil-quench sequences to avoid warping or cracking. Always allow the part to reach ambient temperature before finish grinding to final dimensions. Personal protective equipment appropriate for machining and heat-treating operations should be used at all times.