Countersink drill bits are used to bevel the outer-facing edge of a previously drilled hole. 60° Countersinks are used for centering. 82° Countersinks are used for Countersinking flat head screws. 90° Countersinks are used for chamfering and deburring. 100° Countersinks are used to make screw and rivet holes.
SINGLE FLUTE COUNTERSINK:
Single Flute Countersinks should be used when multi-flute countersinks chatter or the hole is too small for a multi-flute countersink to enter.
3 FLUTE CENTER REAMER COUNTERSINK:
Center Reamers are designed for countersinking holes for flathead screws and rivets, in portable drilling applications.
4 FLUTE MACHINE COUNTERSINK:
Four Flute Machine Countersinks have a longer shank to use in Turret lathes and for screw machine work.
6 FLUTE CHATTERLESS COUNTERSINK:
Six Flute Chatterless Countersinks are designed for fast shearing cuts.
Fluteless Deburring Tool:
Fluteless Deburring Tools are used to remove burrs from the edge of a countersunk hole.
Sources: Drillco Cutting Tools Product Catalog 2013, Champion Cutting Tools 2011 Product Catalog, Norseman/CTD Product Catalog 2013
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