1-1/8" X 5/16" Pilot Hole HSS Taper Shank Counterbore BoltsandNuts.com Part Number D/AN9/16

Part Number D/AN9/16

Size 1/4"-48

Metric Hex Nuts Zinc Plated

Part Number: BIT-D/ACO3/8X1/2

Part Number DWRR58

1-1/8" X 5/16" Pilot Hole HSS Taper Shank Counterbore BoltsandNuts.com Part Number D/AN9/16Product 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