National Item Identification Number
01-266-1929
012661929
5133-01-266-1929
5133012661929
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)
76301
Reference Numbers (Part Numbers)
SPT21-74D110174-5001TD
Required Categories
MATERIAL
HARDNESS RATING
CUTTING END STYLE
SHANK STYLE
WIDTH ACROSS FLATS
O
Required Description
STEEL OVERALL
NOT RATED
21 SOLID
91 HEXAGON
0.375 INCHES NOMINAL
1.800 INCH