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The black oxide finish won't flake or chip off
Part Number D/ACT14
Part Number DWDRSD12
Part Number T/A54094
9/32" X 3/32" HSS Aircraft Counterbore 1/4" Shank BoltsandNuts.com The black oxide finish won'tProduct 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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