1-3/4" X 7/16" Pilot Hole HSS Straight Shank Counterbore Quantity:1 Part Number: Gauges-BoltNutGauge-WallMount

Part Number: Gauges-BoltNutGauge-WallMount

Part Number DWRRW

Part Number DWDBL9/16

friction ring

1-3/4" X 7/16" Pilot Hole HSS Straight Shank Counterbore Quantity:1 Part Number: Gauges-BoltNutGauge-WallMountProduct 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