Mike is right on. This is what is commonly used in manufacturing by Machinists and Tool & Die Makers. You could also check out McMaster-Carr at https://www.mcmaster.com/#step-drill-bits/=1cxrncu
Mike is right on. This is what is commonly used in manufacturing by Machinists and Tool & Die Makers. You could also check out McMaster-Carr at https://www.mcmaster.com/#step-drill-bits/=1cxrncu
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Since MDF is mentioned, step drills for confirmat screws might partially fulfill the op's search. Hafele and Rockler have their own versions--at opposite extremes of the budget.
I would look at Confirmat screws as well. Search Amazon for "confirmat" to see the screws and links to the bits, which drill the pilot hole with a clearance hole for the smooth portion of the screw and a countersink for the head so the screwhole can be plugged. I've used them on MDF and particle board and they work extremely well.
Paul, I mis-read your post in my last reply thinking you were talking 3/4" diameter not depth. This may be a low-ish cost for something that is adjustable and is made for thousands and thousands of holes with a 3/8" bore but has much greater depth capacity and adjustable pilot depth.
https://www.amanatool.com/424000-fac...9mm-shank.html
I use a lot of Kreg Pocket Hole screws for what you are describing, with or without a pilot hole. If you are trying to use screws to pull two parts together, I would use a pocket hole screw first, to pull them together, then screw your finish screws in place, then replace that pocket hole screw with whatever you were using on the remainder of the project.
Doc
As Cort would say: Fools are the only folk on the earth who can absolutely count on getting what they deserve.
+1 on the type screws Glen Bradley recommends, but I do want to address your comment on the dulling of the countersink.
I had the same problem, using a lot of PB and MDF. You can sharpen the countersink with a diamond file, but I found a set of countersinks by (I think) Snappy that had carbide edges, and also take replaceable brad point drill bits. They last a really long time.
Rick Potter
DIY journeyman,
FWW wannabe.
AKA Village Idiot.