33/64" X 3/16" Pilot Hole HSS Straight Shank Counterbore BoltsandNuts.com Point Angle: 135°

Point Angle: 135°

Part Number DWDTS1-3/4-4MT

Flute Length: 4-3/8"

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

33/64" X 3/16" Pilot Hole HSS Straight Shank Counterbore BoltsandNuts.com Point Angle: 135°Product 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