5/8" X 1/8" HSS Aircraft Counterbore 1/4" Shank Quantity:1 Part Number DAM18X3/8

Part Number DAM18X3/8

Part Number DAM18X5/16

Drill Bit Size: 6

Part Number DWTT1-1/8-12

Part Number: DUR115-95

5/8" X 1/8" HSS Aircraft Counterbore 1/4" Shank Quantity:1 Part Number DAM18X3/8Product Description 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 counterbores are made of two piece construction, having an integral shank and