31/32" X 5/16" Pilot Hole HSS Straight Shank Counterbore BoltsandNuts.com Part Number: BIT-DMS73-1090

Part Number: BIT-DMS73-1090

High Quality Black Front / Black Back Patch Vintage BoltsandNuts

Part Number DWDTS47/64-3MT

Part Number: BIT-KFDW

Part Number DWRR41/64

31/32" X 5/16" Pilot Hole HSS Straight Shank Counterbore BoltsandNuts.com Part Number: BIT-DMS73-1090Product 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