9/16" X 3/16" Pilots for Counterbore Quantity:1 Part Number D/AA/CX65/16

Part Number D/AA/CX65/16

Part Number DULSN1

Part Number D/A3F51/64

Part Number DWTSMR212-34X3

Grade 8 Lock Washers Zinc Yellow

9/16" X 3/16" Pilots for Counterbore Quantity:1 Part Number D/AA/CX65/16Product 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