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Pilot hole + countersink bit for #8 screws--am I crazy?

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Forum topic by deadherring posted 08-15-2017 06:57 PM 513 views 0 times favorited 6 replies Add to Favorites Watch
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deadherring

59 posts in 1479 days


08-15-2017 06:57 PM

Hey all,

I feel like I might be losing my mind. I’ve purchased the bits that have the countersink built in for #8 screws (what i use primarily in the shop) for years. I feel like they’ve always been 1/8” and have worked great for me.

Recently my bits were all dull so I went to restock. I looked at HD, Lowes, and Amazon and they all seem to be 11/64. I bought a few and when I use them at home, it seems to be creating a hole that is too big for #8 screws:

https://www.amazon.com/DEWALT-DW2711-Replacement-Drill-Countersink/dp/B0000DD6M1/ref=sr_1_3?ie=UTF8&qid=1502823229&sr=8-3&keywords=8+countersink+drill+bit

I tried a #6 countersink and it is 9/64, also too big:
https://www.amazon.com/DEWALT-DW2567-Countersink-64-Inch-Drill/dp/B0000225OV/ref=sr_1_5?s=hi&ie=UTF8&qid=1502823305&sr=1-5&keywords=6+countersink+drill+bit

I can’t seem to find a bit with a built in countersink that is 1/8.

Have i lost my mind? Did something change while i was asleep? Anyone have a link to a 1/8” countersink?

Thanks,

Nathan


6 replies so far

View Rick_M's profile (online now)

Rick_M

10614 posts in 2215 days


#1 posted 08-15-2017 08:07 PM

DeWalt had some very bad quality control issues on their countersinks right now, that could be part of it.

-- http://thewoodknack.blogspot.com/

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deadherring

59 posts in 1479 days


#2 posted 08-15-2017 08:43 PM

@Rick M: Just to clarify, what I’m saying is when I’ve purchased a #8 countersink/pilot hole combo bit it’s always been 1/8th. Now, they are 11/64 which makes a hole too big for a #8 screw.

View jerryminer's profile

jerryminer

800 posts in 1277 days


#3 posted 08-15-2017 09:15 PM

Lee Valley has these: Countersink bits

(I think they are made by Snappy)

-- Jerry, making sawdust professionally since 1976

View patcollins's profile

patcollins

1605 posts in 2700 days


#4 posted 08-15-2017 09:23 PM

Well 11/64 is the through hole size and not the size hole to use if you want the threads to catch any wood. It sounds like they are now designed for a through hole instead of a pilot hole.

Here is a chart that does a little explanation of the 11/64”, I suppose they assume you will use a screw that is long enough for the threads to engage?

https://www.boltdepot.com/fastener-information/Wood-Screws/Wood-Screw-Pilot-Hole-Size.aspx

View Nubsnstubs's profile (online now)

Nubsnstubs

1207 posts in 1565 days


#5 posted 08-15-2017 10:36 PM

If you are using a 2” screw, set you counter sink at 2” . If you’re using 1 1/4”, set it at 1 1/4”. That’s the way it’s designed to be used. It sounds like you are setting the countersink at the top of the bit instead of for the size of the screw your drilling for. Set properly, the taper allows the screw to get a bite, the straight portion allows for a through hole, and the countersink allows the screw head to be flush or hide below any surface you’re screwing into.

  • Drill, countersink and counterbore in one step *

That’s from the description in the second link you posted….............. Jerry (in Tucson)

-- Jerry (in Tucson) www.woodturnerstools.com

View AlaskaGuy's profile

AlaskaGuy

3645 posts in 2144 days


#6 posted 08-15-2017 10:39 PM

I don’t know for sure if this is any help but, the chart show 11/64 for tappered bits and 1/8 for straight bit for #8 screws.

https://www.jamestowndistributors.com/userportal/document.do?docId=279

-- Alaskan's for Global warming!

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