Starrett 53981 O1 Tool Steel Flat Stock 3/32x1-1/4x18in

Product Description

The STARRETT 53981 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die work, punches, gauges, and precision machined components. Manufactured to AISI Type O1 specification, this flat stock measures 3/32 inches thick, 1-1/4 inches wide, and 18 inches long. Thickness tolerance is held to +/- 0.001 inches, supporting applications where dimensional consistency is critical before heat treatment. With a weight of 0.6 pounds per piece, it is sized for bench use or small fixture fabrication. Machinists, tool and die makers, and precision fabricators work with O1 stock because it machines cleanly in the annealed state and responds predictably to oil-quench hardening.

O1 tool steel flat stock is used in low-to-medium production tooling environments including jigs, fixtures, blanking dies, cutting tools, and wear components. This 18-inch length suits single-part or short-run applications where the blank is cut to final geometry before hardening. The material arrives in the annealed condition, ready for machining, grinding, and final heat treat. It is appropriate for both job shop and maintenance toolroom settings where precise, repeatable stock dimensions are required.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable heat treat response
• Thickness held to +/- 0.001 inches for consistent pre-grind stock removal
• Width tolerance of 0.000 to -0.005 inches provides close dimensional control
• Length tolerance of +0.250 inches allows for facing and squaring to final length
• Edge squareness specification of 0.003 inches per inch on all edges
• Annealed condition allows conventional machining and grinding prior to hardening

Compatibility

Designed as a standard O1 oil-hardening flat stock blank suitable for toolroom, die shop, and precision machining applications requiring AISI Type O1 tool steel in flat bar form.

Installation Notes

O1 tool steel flat stock is worked by machinists and tool and die makers using conventional milling, turning, drilling, and surface grinding equipment. Secure workholding is required due to the close tolerances of the finished stock. Heat treatment, including hardening and tempering, should follow established metallurgical procedures for AISI O1 and must be performed by qualified personnel using properly calibrated furnace equipment. Allow material to reach thermal equilibrium before quenching to avoid distortion.