1-13/16" X 7/16" Pilot Hole HSS Taper Shank Counterbore Shopify Collective Grade 8 Hex Flange Bolts

Grade 8 Hex Flange Bolts IFI-111 Zinc Yellow

mirrors & very hard ceramic tile

Size 2-1/2"-4

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Pieces in Set 41

1-13/16" X 7/16" Pilot Hole HSS Taper Shank Counterbore Shopify Collective Grade 8 Hex Flange BoltsProduct 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