What does #6 #7 #8 s***w size mean?

Question

What does #6 #7 #8 s***w size mean?

Answer 1

its the diameter of the s***w,  as in thickness  the smaller the number the thinner it is.

Answer 2

It refers to the weight of the s***w. Basically an 8 is heavier than a 6. Go look at some in a hardware store such as LOWES and you'll be able to tell the difference.

If you had #6's and the holes became stripped, but the length could not be altered, you would go to #8's of the same length.

Answer 3

basicly it's the size of the shank of the s***w, how big around.

And it it's a robertson, it tells the size of screwdriver bit.