Drill Rod Tool Steels 57958 O1 Tool Steel Flat Stock

Product Description

The DRILL ROD TOOL STEELS 57958 is an O1 oil-hardening tool steel flat stock bar measuring 0.5 inches thick, 4.5 inches wide, and 36 inches long. Conforming to AISI Type O1 specifications, this flat stock is supplied in the annealed condition, ready for machining before hardening. It is designed for toolmakers, machinists, and die makers who require a predictable, fine-grained tool steel that responds reliably to oil-quench heat treatment. Thickness tolerance is held to plus or minus 0.001 inches, making it suitable for precision tooling applications where dimensional consistency matters before and after hardening.

O1 tool steel flat stock at this size is commonly used in the fabrication of dies, punches, gauges, jigs, and fixtures in both job-shop and production tooling environments. The 4.5-inch width and 0.5-inch thickness make it appropriate for medium-format die plates and blanking tools. Machinists and tool and die makers working in manufacturing, metal fabrication, and precision machining shops are the primary installers and end users of this material. It is cut, ground, and finished to final dimensions before heat treatment.

Key Features

• AISI Type O1 oil-hardening tool steel for predictable heat-treat response
• Thickness tolerance of plus or minus 0.001 inches for close dimensional control
• Width tolerance of plus 0.005 inches, minus 0.000 inches
• Length tolerance of plus 0.5 inches
• Squareness held to 0.003 inches on edges and 0.004 inches per inch of thickness on ends
• Weighs 23.2 pounds per piece at full 36-inch length

Compatibility

Designed as a standard AISI Type O1 oil-hardening tool steel flat bar suitable for general toolmaking, die making, and precision machining applications requiring oil-quench heat treatment.

Installation Notes

Cutting, grinding, and machining of tool steel flat stock should be performed by qualified machinists using appropriate metalworking equipment and personal protective equipment. Material should be machined to final dimensions before heat treatment, as distortion can occur during hardening and tempering. Follow established heat-treatment procedures for AISI O1 tool steel, including proper preheat, hardening temperature, oil-quench, and temper cycles. Consult material safety data and applicable shop safety standards before cutting or grinding.