49/64" X 1/4" Pilot Hole HSS Straight Shank Counterbore Shopify Collective Part Number: 2501-BDLP-126-1795

Part Number: 2501-BDLP-126-1795

Part Number: M16X90DPPOAPL

Part Number DWTHX1386

Part Number D/ARSD3/8X35/64

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49/64" X 1/4" Pilot Hole HSS Straight Shank Counterbore Shopify Collective Part Number: 2501-BDLP-126-1795Product 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