Drill America DEWA/CCBR21/32 21/32" X 3/16" HSS Aircraft Counterbore 1/4" Shank, DEWA/CCBR21/32 Shop By Category > Shop Equipment>Work Stands Brush Research 1EK 1-E Kit-

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Drill America DEWA/CCBR21/32 21/32" X 3/16" HSS Aircraft Counterbore 1/4" Shank, DEWA/CCBR21/32 Shop By Category > Shop Equipment>Work Stands Brush Research 1EK 1-E Kit-Drill America DEWA CCBR21 32 21 32" X 3 16" HSS Aircraft Counterbore 1 4" Shank, DEWA CCBR21 32 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 is designated as counterboring. These