17/32" X 1/8" HSS Aircraft Counterbore 1/4" Shank Shopify Collective 5xDia): 20mm

5xDia): 20mm

Part Number: 50X300DPOSAPL

Part Number DWD13J-TN-SET

Part Number: assortment-kit-508304 Pieces - Coarse Thread

Part Number: M20C150HCS88Z

17/32" X 1/8" HSS Aircraft Counterbore 1/4" Shank Shopify Collective 5xDia): 20mmProduct 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