Cleveland C12227 Taper Shank Drill Bit 51/64 in 3MT Hss

Product Description

The CLEVELAND C12227 is a taper shank twist drill bit designed for precision hole-making in metal, wood, and general-purpose materials. Built from high-speed steel with an oxide finish, it delivers reliable performance in production and maintenance drilling applications. The bit features a 51/64 inch (0.7969 inch) diameter, a 118-degree standard point angle with web thinning for easier penetration, and a right-hand spiral flute for efficient chip evacuation. With a 6.125-inch flute length and 10.75-inch overall length, this bit is suited for deeper bores in machines that accept a No. 3 Morse taper spindle. Licensed machinists, tool-and-die technicians, and maintenance professionals are the typical installers.

The C12227 is built for use in drill presses, lathes, milling machines, and other machine tools equipped with a No. 3 Morse taper socket. It handles general-purpose drilling in steel, cast iron, aluminum, and similar workpiece materials. The oxide finish provides mild corrosion resistance and reduces friction during cutting. This bit is appropriate for both job-shop and production environments where a reliable, standard-geometry taper shank drill is needed for medium-to-large diameter bores.

Key Features

• 51/64 inch diameter (0.7969 inch decimal) for precise bore sizing within ASME B94.11M tolerances
• No. 3 Morse taper shank for direct mounting in compatible machine tool spindles without a chuck
• 118-degree standard point angle with web thinning for reduced thrust and cleaner entry
• Right-hand regular spiral flute promotes efficient chip clearing during drilling
• High-speed steel construction handles a wide range of general-purpose workpiece materials
• Oxide finish reduces surface friction and provides light corrosion protection

Compatibility

Designed as an OEM-style replacement or standard tooling selection for machine tools equipped with a No. 3 Morse taper spindle socket, consistent with ASME B94.11M specifications for taper shank twist drills.

Installation Notes

Installation is performed by machinists or qualified machine tool operators. Before inserting the taper shank, ensure the machine spindle and taper shank are clean and free of chips or oil that could prevent full seating. Drive the taper shank firmly into the spindle socket by hand or with a soft mallet until seated, and use a drift and knockout slot to remove safely when changing tooling. Always power down and lock out the machine before installing or removing drill bits.