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ship and engine builders
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13/16" X 1/2" Pilots for Counterbore - High Performance & Durable Cutting Tool | Drill America Pipe Equipment ship and engine buildersCounterboring is the enlargement of a portion of a hole that has previously been formed. If the counterbored portion is shallow (1 8" or less), the operations 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 counterboring. These counterbores are made of two piece construction, having an integral shank and counterbore cutter, and a