13/16" X 1/4" Pilots for Counterbore BoltsandNuts.com Flute Length 4-1/8"

Flute Length 4-1/8"

Diameter/Pitch: 1"-12

Part Number: DUR367-95

Part Number DWTSH1-3/16-12

Shank Size 11/32"

13/16" X 1/4" Pilots for Counterbore BoltsandNuts.com Flute Length 4-1/8"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