Difference between different # screws?

[mojo_13]

I looking at gettin some screws for the kreg pocket system and I see they have different # screws say a #8 and a #2 but they are both 1 1/4 was just wondering if that had something to do with the threads on them or something completely differetn. Any help would be appreciated.

[reddog552]

Thread Sizes

http://en.wikipedia.org/wiki/Screw I was going to explain Try this

[mschrank]

If you had asked about #8 and #10, I might be able to help...are you sure you saw a #2? That would be a very very small screw. Screws are sized by guage, with the bigger the number, the larger the diameter of the screw.

I'm sure someone will chime in and explain how the numbers actually correlate to something real.

I use more #8 size than anything else, but occasionally use #10 for heavier applications and #6 for lightweight applications.

[mojo_13]

Thank you for the wikepdia link I had searched on the net for an answer but came up empty never even looked there.


Ya it's a #2 and it says on the kreg webite that it is there most popular screw.

http://www.amazon.com/Kreg-SML-C125-...6917817&sr=8-2

[Tequila]

The #2 means that it takes a #2 square drive bit to turn it. Similar to how phillips bits come in #0, #1, #2, etc.

[gsmittle]

I'm pretty sure it's a #2 square drive. That's the size of the bit to drive the screw. The screw size is #8. There are two different heads, though.

g.

[docrowan]

I haven't anything to back me up, but in my experience if you divide the screw size by 64, you come up with the right size drill bit to drill the pilot hole for a screw. Perhaps it's coincidence, but a 1/8" (8/64") drill bit is the perfect size for drilling a pilot hole for a #8 wood screw. A 3/32" (6/64") drill is perfect for a #6 wood screw. Has anyone else run across the same thing?

[thiggy]

McFeely's lists two sizes for Kreg pocket holes - #7 and #8.

[gsmittle]

At the risk of hijacking the thread....

McFeely's lists two sizes for Kreg pocket holes - #7 and #8.

Are the #7s the pan heads? I know, I could look it up myself, but I'm about to start teaching. That's my story and I'm sticking to it.

g.

[sacherjj]

The #2 has to be talking about the square drive. The pocket screws thread sizes can't vary too much, because all the holes are drilled with the same bit.

Both #7 and #8 sized thread come in washer or pan. So it doesn't tell the difference between that.

[Im A Little Petunia]

Hi Joe:
I use the Kreg System. I use #7 Course (soft woods), washer head and #7, fine (hard woods), washer head. #2 is the size driver for the screws. On 3/4" stock I use the 1-1/4". Hope this helps you.

Im A Little Petunia

[Im A Little Petunia]

O'ops - sorry, I should have said Mojo instead of Joe when I addressed the question regarding screw sizes!

Im A little Petunia

[LCHIEN]

#2 would be referring to the #2 robertson square drive.
#7, #8, and sometimes #6 are the diameters of pocket screw shanks, they compare to #6, #7 (Hardly ever seen) and #8 wood screw sizes, I'm pretty sure.
The lengths are 1", 1.25, 1.5, 2, 2.5" recommended for
1/2", 3/4", 1" etc. thick material respectively.
The reason is that as the material thickens, they want the screw to come out approx.in the middle of the thickness width of the wood. To do this the pocket is started farther from the end so the angle puts the hole exit in the middle. That then requires a longer screw to get the same penetration depth into the joined pice of wood.

On top of that Kreg (and McFeeley) offer two head styles, washer head and pan head, plus three thread types (fine, coarse, and hi-lo) and two finishes (regular and anti-corrosion).

You could spend a fortune preparing for any eventuality and the screws are not cheap either, running about 3 to 5 cents per screw depending on whether you buy 1000's or 100's at a time.

There is a partial solution, Both McFeeleys and Kreg (check Amazon) sell pocket screw assortments ranging from $6 to $15 or so. They'll have 25 or so of each of the the popular combinations of lengths and heads and thread types. comes in compartmented plastic storage boxes. Try combinations of search keywords kreg pocket screw kit set

[Jeffrey Schronce]

3/4" material = 1.25" Washer Head #8 - Fine Thread for Hardwood - Coarse Thread for Softwood

This will likely cover the majority of your needs. I have never come across the need for pan head. I bought a few thousand 1.25" Fine Washer Heads and use them all the time (oddly, rarely in projects?).

[mojo_13]

Thanks all for the help just bought the Kreg Master System and 1,000 of the 1 1/4 fine and coarse screws hope it works out