Kreg Owners' Community

Just trying to get ready to start to make some items after the new year and was looking at getting a few different screw sizes. I noticed some listed by length, coarse or fine, then #8, #7, #2. I understand the length as difined by Kreg. To use course on soft woods and fine on hardwoods. Is the # size the square drive size or is this in reference to the diameter of the screw or what? I hope this is not a silly question.

Views: 11007

Reply to This

Replies to This Discussion

Thanks for the help.
Screws are categorized in 3 main ways - the type an size of the driver, the diameter (of the shank) and the length. The numbering system is similar and that may be causing the confusion.

First, is the size and style of the driver used for the screw. In case of Kreg screws, they are Square Head size #2. Square head drivers are available commonly in #1, #2 or #3 with #1 being the smallest. Phillips heads are specified the same way, #1, #2, #3. You can look at a kit of screwdrivers and see that the drivers are marked with a #1, #2, or #3 to indicate the size of the driver.

Next is the diameter of the screw itself - the diameter of the shank.. Typical sizes for drywall, pocket hole screws, machine screws, etc are #6, #7, #8, etc with larger numbers indicating larger diameters. Here's a link to a chart of wood screw diameters : www.mypianoshop.com/Screw_Chart.pdf

Last is the length of the screw as measured in inches, ie 1 1/4" screw.

For Kreg screws, most sizes are also available in either coarse or fine thread.

So for example, the most popular screw sold by Kreg for 3/4" wood is the 1 1/4" inch length, #2 square head drive, and #7 shank diameter. It is available in either coarse or fine thread.

You can go to the hardware store and look at drywall screws, and see how they are marked the same way, except that they typically use #2 phillips head drivers.

hope this helps
Diameter of the screw. Kind of like the penney size of nails.
Very nice description, this is very helpful.

They are similar to machine screws then having their diameters being called out by number sizes until they reach I believe 3/16" or 1/4". I should have known since I have worked with metal fasteners like socket head cap screws. Mostly work with metric fasteners now (European company). They are called out by their metric diameter and length.
Thanks again and the link is helpful. I will save it to my documents and print it off.

Mark Quo said:
Screws are categorized in 3 main ways - the type an size of the driver, the diameter (of the shank) and the length. The numbering system is similar and that may be causing the confusion.

First, is the size and style of the driver used for the screw. In case of Kreg screws, they are Square Head size #2. Square head drivers are available commonly in #1, #2 or #3 with #1 being the smallest. Phillips heads are specified the same way, #1, #2, #3. You can look at a kit of screwdrivers and see that the drivers are marked with a #1, #2, or #3 to indicate the size of the driver.

Next is the diameter of the screw itself - the diameter of the shank.. Typical sizes for drywall, pocket hole screws, machine screws, etc are #6, #7, #8, etc with larger numbers indicating larger diameters. Here's a link to a chart of wood screw diameters : www.mypianoshop.com/Screw_Chart.pdf

Last is the length of the screw as measured in inches, ie 1 1/4" screw.

For Kreg screws, most sizes are also available in either coarse or fine thread.

So for example, the most popular screw sold by Kreg for 3/4" wood is the 1 1/4" inch length, #2 square head drive, and #7 shank diameter. It is available in either coarse or fine thread.

You can go to the hardware store and look at drywall screws, and see how they are marked the same way, except that they typically use #2 phillips head drivers.

hope this helps

Reply to Discussion

RSS

Need Help?

For Technical Support, please call 800-447-8638 or send a message. Reps are available Monday through Friday from 8am to 5pm CST. 

Videos

  • Add Videos
  • View All

Forum

Jig settings for 2 ¾ x 1 ½ boards with 30 degree miters?

I making a hex ring out of 2x4s ripped to 2 ¾ inches wide with 30 degree miters.  What setting on the Jig should I used? 1 ½ is too much.  Thanks.Continue

Started by Patrick Halinski in Kreg Jig® Operation Dec 30, 2023.

40mm Cup Hinge Jig Question

Hi All.....I have the 35mm Kreg Jig hinge drill guide. The guide is great for 35mm Hinge Cups, but I have a speciality 40MM hinge cup to drill.Has anyone adapted the Kreg guide to work with 40mm Forsner drill bits? Or have a guide that works…Continue

Started by Ed Anderson in Beginners' Zone Oct 3, 2023.

Product Reviews

New Kreg 720Pro

I saw the video Kreg put out for this new jig and had high hopes for it.

I purchased one today and am very disappointed with it.

First the docking station is extremely cheap. The plastic is pathetic. A Lego has more…

Continue

Posted by Duke Leon on February 15, 2021 at 9:00pm

Not Pleased With Pocket Hole Construction

Several months ago, I purchased the Kreg K4MS so that I could build the Lego Table as outlined on the companion "buildsomething" web site which exclusively uses pocket hole construction.  I have considerable experience with conventional…

Continue

Posted by Robert Ringel on September 17, 2020 at 1:48pm — 9 Comments

© 2024   Created by KregRep.   Powered by

Badges  |  Report an Issue  |  Privacy Policy  |  Terms of Service

_