9/16" X 3/16" Pilots for Counterbore Quantity:1 Part Number D/A3F51/64

Part Number D/A3F51/64

Part Number D/AA/CX65/16

Part Number: Assortment Kit #143540 Pieces - Fine Thread

Part Number DWRRHDSP1-3/8

fill the gaps in incomplete size ranges

9/16" X 3/16" Pilots for Counterbore Quantity:1 Part Number D/A3F51/64Product 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