What size screws to use to pocket screw the top to the frame? I only had 1-1/4" (too short) and 2-1/2" (too long). I ended up using 2" wood screws instead.
For future reference, the standard sizes for Kreg screws are as follows: 3/4", 1", 1-1/4", 1-1/2", 2" and 2-1/2". Lowes carries a few of the common sizes, Woodcraft, Rockler, and others carry the full selection of Kreg screws (I keep at least a few hundred of every size on hand for various jobs).
Recommended Screw for given material thicknesses (assuming each section is of equal thickness):
Standard Blue Guide Block*
If thickness is 1/2" use 1" screw
If thickness is 5/8" use 1" screw
If thickness is 3/4" use 1-1/4" screw
If thickness is 7/8" use 1-1/2" screw
If thickness is 1" use 1-1/2" screw
If thickness is 1-1/8" use 1-1/2" screw
If thickness is 1-1/4" use 2" screw
If thickness is 1-3/8" use 2" screw
If thickness is 1-1/2" use 2-1/2" screw
*** Use
washer-head screws for all but 1" screw size ***
Black Micro Guide Block*
If thickness is 1/2" use 3/4" screw (but set jig at 5/8")
If thickness is 5/8" use 3/4" screw (with jig set at 5/8")
*** Otherwise use same as Blue Guide Block, Use
pan-head screws only ***
* Note: Use Fine threads in hardwoods, course threads in softwoods and hi-low threads in MDF and particle board. For screw lengths of 2" and 2-1/2" use coarse threads in all woods.