33UN11 Center Drills

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Hey-type center drills with a bell tip have flats on their end that accept carbide inserts. They can be used on Hey machines for facing a workpiece and creating center holes on it so it can be turned between centers on a lathe. The drills have a bell tip with an additional 120° chamfer that bevels the outer edge of the hole to help protect the hole from damage during machining applications. Bell-tip center drills are commonly used in applications where parts will go through multiple machining passes and there is risk of marring the edges of the center hole. These center drills have set screw flats for locking the center drills into the tool holder.