1" X 3/16" HSS Aircraft Counterbore 1/4" Shank BoltsandNuts.com Part Number DWTSMR212-38X4

Part Number DWTSMR212-38X4

Part Number DEW112180

5 HRC for use on impact wrenches

Part Number D/AA/CX1219/64

1" X 3/16" HSS Aircraft Counterbore 1/4" Shank BoltsandNuts.com Part Number DWTSMR212-38X4Product 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