1-3/4" X 7/16" Pilot Hole HSS Straight Shank Counterbore BoltsandNuts.com Length Under Head: 2-1/2"

Length Under Head: 2-1/2"

Part Number DWC6MM-4FSE

Part Number: 75C450HCSL9Y

to ensure the highest standards of dimensional accuracy and consistency • 6150 Steel – We make our keys with 6150 chromium vanadium steel that's heat-treated to 44-50 HRC to produce tools that are hard

Part Number DWTSR112-91616

1-3/4" X 7/16" Pilot Hole HSS Straight Shank Counterbore BoltsandNuts.com Length Under Head: 2-1/2"Product 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