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		                        | National Stock Number:
 5133-01-294-4026
 
 Federal Supply Class:
 5133
 
 National Item Identification Number:
 012944026
 
 Description:
 COUNTERBORE,MACHINE
 
 Detail:
 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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 Manufacturer Information:
 
 | 23C4196 | 81755 | LOCKHEED MARTIN CORPORATION | 
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