13/32" X 1/8" HSS Aircraft Counterbore 1/4" Shank Quantity:1 Part Number D/ACO57/64

Part Number D/ACO57/64

Part Number DWTH112-1220LH

Part Number DWTHSHEX5818

1/4" x 4”

Part Number DWDTLCO3/8

13/32" X 1/8" HSS Aircraft Counterbore 1/4" Shank Quantity:1 Part Number D/ACO57/64Product 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