Countersink bits question?

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  #1  
Old 07-29-20, 07:37 AM
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Countersink bits question?

Guy's, I'm exposing my ignorance, and I feel very foolish. But I've forgotten more things that use to be 2nd nature to me before.

Anyhow I've got these two counter sink tool bits. I need to know what the difference between them are and where one is used as opposed to the other. I do know I bought them specifically for a particular reason and use many years ago.

Their both Craftsman bits. The one on the right is 1/2" p/n 9-671061. The one on the left is not mark in size but I believe to be 1/2 also with p/n 9-4205

The angles are different. I need the correct one to countersink a hole in an aluminum angle that will be screwed down into a wood threshold using deck screws. This is going to be a temporary runner for a sliding screen for the lower wheels. So the screw heads must be flush and not protrude up.



The one on the right is 9/16" if measured with a caliper but if I do a Google check it says it's 1/2 for that P/N
 

Last edited by Norm201; 07-29-20 at 07:44 AM. Reason: Correction again
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Old 07-29-20, 07:54 AM
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Use the one that most closely matches the profile of the screw head you are using.
 
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Old 07-29-20, 08:07 AM
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Yea, I did some sample drilling and it appears the 90 vs 82 is the better of the two.
 
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Old 07-31-20, 12:23 PM
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Check out "Zero Flute Countersinks". They leave an extremely smooth finish and I think they are quicker. I used them to prep aluminum storefronts.for security hardware. They work very well in wood.
 
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Old 07-31-20, 05:04 PM
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Funny you should mention al and wood. It's exactly what I needed it for. Made new temporary bottom guide from al angle for sliding screen door at cabin.
 
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