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Part Number: EZ-SK31115
Part Number: BIT-KFDC
Part Number DWRR11/64
Tap Size: M12-1
17/32" X 1/8" HSS Aircraft Counterbore 1/4" Shank BoltsandNuts.com Part Number: EZ-SK31115Product 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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