1" X 5/16" Pilot Hole HSS Taper Shank Counterbore Quantity:1 Flute Length 3-1/4"

Flute Length 3-1/4"

Part Number: M12C80ASB12BO

Size: 3/16"

Part Number: 62C850WA2Z

Tap Drill Size 1-7/64"

1" X 5/16" Pilot Hole HSS Taper Shank Counterbore Quantity:1 Flute Length 3-1/4"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