National Item Identification Number
01-050-6039
010506039
5133-01-050-6039
5133010506039
National Stock Number
Item Name
COUNTERBORE,MACHINE
Federal Supply Class
5133
Description
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.
Commercial and Government Entity Code (Supplier Data)
Reference Numbers (Part Numbers)
Required Categories
MATERIAL
HARDNESS RATING
CUTTING END STYLE
SHANK STYLE
SHANK DIAMETER
OVERA
Required Description
STEEL OVERALL
40.0 ROCKWELL C MINIMUM AND
53.0 ROCKWELL C MAXIMUM
22 INTERCHA