WebA counterbore (symbol: ⌴) is a cylindrical flat-bottomed hole that enlarges another coaxial hole, or the tool used to create that feature.A counterbore hole is typically used when a fastener, such as a socket head cap screw … WebAircraft 1/4 Shank Counterbores. Counterboring 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 ...
Making CounterBores from drill rod in the home shop
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Cleveland Counterbores - Cutting Tool Supply
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