Drill Rod Tool Steels 66816 O1 Tool Steel Flat Stock

Product Description

The DRILL ROD TOOL STEELS 66816 is an O1 oil-hardening tool steel flat stock bar measuring 3/16 inches thick, 3/4 inches wide, and 36 inches long. Manufactured to AISI Type O1 specification, this flat stock is used in toolmaking, die making, punches, gauges, and other precision machined components that require a hardenable tool steel substrate. The O1 grade responds well to oil quenching and offers good dimensional stability through the hardening process. Thickness tolerance is held to plus or minus 0.001 inches, making it suitable for applications where close dimensional control in the pre-hardened or hardened state is required. Machinists, toolmakers, and precision fabricators typically work with this material.

This flat stock is suited for job shops, tool and die operations, and maintenance machining environments. It is commonly used to produce cutting tools, forming dies, jigs, fixtures, and wear components in both small-batch and one-off production. The 36-inch length provides a practical stock length for most bench and mill operations without requiring initial cutdown. Width and length tolerances allow for straightforward layout and rough machining before final hardening and grinding.

Key Features

• AISI Type O1 oil-hardening tool steel material specification
• Thickness held to 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: Edge 0.003 inches, End 0.004 inches per inch of thickness
• 36-inch stock length suitable for most toolroom and bench applications

Compatibility

Designed as a standard O1 oil-hardening tool steel flat bar for general toolroom, die making, and precision machining applications requiring AISI Type O1 material.

Installation Notes

Cutting and machining should be performed with appropriate metalworking tools rated for tool steel stock. Oil hardening should be carried out by a qualified heat treater following established procedures for AISI O1 tool steel, including proper soak temperature and quench technique. Always wear appropriate personal protective equipment when cutting, grinding, or heat treating tool steel. Allow material to reach ambient temperature before taking finish measurements after hardening.