19/32" X 1/8" HSS Aircraft Counterbore 1/4" Shank BoltsandNuts.com Part Number: 87BFW

Part Number: 87BFW

Part Number: Assortment Kit #366738 Pieces - Coarse Thread

Drill Size: 21mm

Part Number: 62F250HCSL9Y

Part Number GLBCOX1223

19/32" X 1/8" HSS Aircraft Counterbore 1/4" Shank BoltsandNuts.com Part Number: 87BFWProduct 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