7/16" X 5/32" Pilot Hole HSS Taper Shank Counterbore Quantity:1 Part Number DWT54782

Part Number DWT54782

Cobalt screw machine drills (also know as stub or stubby drills) are manufactured to Aerospace Standard 907

Part Number DWRRU

Part Number D/ACT30

7/16" X 5/32" Pilot Hole HSS Taper Shank Counterbore Quantity:1 Part Number DWT54782Product 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