1" X 3/8" Pilots for Counterbore BoltsandNuts.com Size 1"-18

Size 1"-18

the geometry of each opening contacts and applies force to the flat sides of fastener heads rather than the corners • No Skipped Sizes – This set contains every size from 1/4 inch to 1 - 1/4 inch

Part Number T/A54235

and square shapes

1" X 3/8" Pilots for Counterbore BoltsandNuts.com Size 1"-18Product 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