57/64" X 1/4" Pilot Hole HSS Straight Shank Counterbore Quantity:1 Size 5/8"-40

Size 5/8"-40

A4-70 Stainless Split Lock Washers

Trade Size AL-16C6

Part Number DEWCCD8

Part Number TSC7/16-30

57/64" X 1/4" Pilot Hole HSS Straight Shank Counterbore Quantity:1 Size 5/8"-40Product 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