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H6 - Federal Item Name Directory
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05259
COUNTERBORE,MACHINE
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FIIG: A188A0
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Entry Date: Apr-01-1974
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Concept:
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Status: A
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Applicability: F
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Type: 0
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Definition: An end cutting tool having two or more cutting edges with flutes or grooves for the passage of cuttings, an integral or removable holder designed for adaption to the end of a machine spindle. The flutes or grooves are usually helical to give a positive rake at the cutting edges. It is designed to form a flat-bottomed enlargement of the mouth of a previously formed cylindrical hole. For items requiring a holder but the holder is not included, use CUTTER, COUNTERBORE.
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Corresponding NIINs: 155
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