Attention Zoro Customers! In observance of Memorial Day, all Zoro offices including customer service will be closed on Monday, May 28. We will resume normal business hours on Tuesday, May 29 at 6:00 a.m. CT. You can continue to place orders online, 24 hours a day, on We hope you have a fun and safe Memorial Day!

Countersink, 6 Fl, 60 Deg, 5/16, Cobalt

KEO| Zoro #: G0898353| Mfr #: 55503

$14.03 /ea

Orders over $50.00 ship free. Details.Standard ground shipping.
Overall Length (In.): 1-3/4Shank Dia. (In.): 1/4Included Angle (Deg.): 60
Save 15%. Sign up for Z-mail.


Zoro #: G0898353 Mfr #: 55503
Overall Length (In.): 1-3/4Shank Dia. (In.): 1/4
Included Angle (Deg.): 60Type: Single Ended
Number of Flutes: 6Item: Countersink
Shank Length (In.): 7/8Application: For Cast Iron, Heat-Treated Steels, Titanium Alloys, Plastic And Wood
Number of Pieces: 1Body Dia. (In.): 5/16
Material: Cobalt SteelFinish: Bright
Country of Origin (subject to change): United States


  • KEO 6-flute line of countersinks are companions to our single flute countersinks and our 3- and 4-flute center reamer line.
  • As a rule, the more edges per revolution, the greater amount of material that may be removed.~We have designed the 6-flute tools with staggered cutting edges.