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Tap Drill Size 49/64"
Part Number: BIT-DMS04-1051
Part Number: EZ-41320
Part Number: BIT-D/ACO3/8X31/64
Part Number: Assortment Kit #145378 Pieces - Fine Thread
1-1/8" X 5/16" Pilot Hole HSS Taper Shank Counterbore Quantity:1 Tap Drill Size 49/64"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
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