9/16" X 3/8" Pilots for Counterbore BoltsandNuts.com making it easy to store

making it easy to store and retrieve your tools • Tight Fit with Fasteners – We precisely manufacture our hex key geometry on the large end of the applicable range

Part Number DWRR53/64

Size 7/16"-40

Part Number T/A54741

Part Number KFD3F1INCH

9/16" X 3/8" Pilots for Counterbore BoltsandNuts.com making it easy to storeProduct 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