Drill America qualtech decor series aircraft counter bore. Counter boring is the enlargement of a portion of a hole that has previously been formed. If the counter bored portion is shallow (1/inches or less), the operation is usually known as spot-facing; for example, a flat Seat for a bolt head or nut. If, on the other hand, the hole is enlarged to a considerable depth, it is designated as counter boring. This counter bore is made of two-piece construction, having an integral shank and counter bore-cutter, and a pilot that is interchangeable, which provides flexibility in the use of the tool. High-speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance. Round shanks allow use with a wide variety of tool holding systems.
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