Buying 90 or 82 zero flute counter sinks.

COMachinist

Active User
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Went over to Amazon to look at a set zero flute counter sinks/deburring tools, found 60, 82 and 90 degree. I want to just to buy the most useful set for deburring holes. What do most of you use?
CH
 
82 degree fits flat head screws, 90 degrees is typical for deburring.

Honestly, for small chamfers you'll never notice the difference between 82 and 90, making the 82 more versatile when you need to countersink a hole for a screw.
 
Winegrower is right about the included angle for imperial (82*) vs. metric (90*) flat-head fasteners. You could buy the one which aligns with the system you use the most in case you ever have a need to sink a flat-head?

I use 90* for deburr/chamfer only because it results in an 'even' appearance (width and depth being the same).
 
Are the angles or live centers 60*?

Usually they are. But not for all bull centers & not sure about live centers with all the interchangeable tips. Regardless a countersink is not normally used to drill centers for use with a dead/live center. Countersinks need an existing hole in order to cut.
 
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