51/64" X 1/4" Pilot Hole HSS Straight Shank Counterbore Shopify Collective Part Number DWTSH1/4-40

Part Number DWTSH1/4-40

Part Number DWC5-530-213

Part Number DWTSMR1316-5

Grade 2 SAE Flat Washers Zinc

Part Number DWDA/CX121/2

51/64" X 1/4" Pilot Hole HSS Straight Shank Counterbore Shopify Collective Part Number DWTSH1/4-40Product 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