Typically the screw should be 1/3 for the thickness of the material to be
attached, 2/3 for the material being attached to. for a 2x4 the thickness
is 1.5" your screw should 4.5".
If you countersink you can reduce the length by equal amounts. Counter sink
3/4" the screw could be 2.25"
If I'm understanding your design correctly......I would suggest using
2x8's with a taper cut on them.
or a 4x4 with two faces tapered
For a sturdy attachment of the legs to the 2x4 table perimeter, a 2x8
will allow for a much larger over lap than the 3.5" square between a
2x4 leg & the perimeter.
The tapered 4x4 can be screwed into through the perimeter 2x4's.
A horizontal plywood gusset / corner stiffener will go a long way to
strengthening the leg / table connection.
FWIW, if you design the legs like a door/window's header support, you
won't have to worry about the fasteners bearing the load.
You may know this already, but...
A header's framing uses a king and jack stud. The jack stud sits under
the header and holds all its weight. (I always think of it like a car
jack.) The king stud continues up the side of the header to the top of
In your situation-- legs consisting of two sistered 2x4's-- one could
act as a jack stud, sitting directly under your 2x4 "ribbon" that goes
around the perimeter, supporting all the weight; and the other could
continue up the side of the ribbon to the table top.
"Playing is not something I do at night, it's my function in life"
That's what I plan on using for the upright 2x4s (handrail) I'm attaching to
the step stingers on our deck. Zinc 3/8" thru bolts with fender washers. I
want some serious compression on that wood besides the actual fastener shear
strength. I'm a machanical type, so any advice is welcome in this new wood
Just curious, why? Esthetic reasons?
I actually prefer carriage bolts for this type of fastening. The head
bits into the wood, locking the bolt (I usually recess the head with a
shallow counterbore). And of course on the other end where the nut goes,
it doesn't make any difference.
Found--the gene that causes belief in genetic determinism
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