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Part Number D/ASTCO3/4
The all-steel construction is jacketed with a thick
One size arbor fits a range of sizes
M6 & M8 are Coarse Thread
Part Number: BIT-T/A54388
5/8" X 1/4" Pilots for Counterbore BoltsandNuts.com Part Number D/ASTCO3/4Product 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
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