a guest wrote:
I am trying to fasten the sink to a 2" granite tile counter.
I have a 3/4" plywood, one 1/2" and one 1/4" hardiback under
the granite tiles. All 4 layers have the same size opening.
So the opening is 2" thick.

Now the fasteners that come with the sinks are designed for
1" or less thick counters. I can't seem to fasten the sink
to the counter. Is there a way around this? I can't find longer
fasteners for the sink.

Now if I do this again, I would cut the granite tiles 1/2" less
so fasteners can attach to them at the edge.
If you cannot find the proper clips then you MAY be able to cut a rebate
(rabbet) into the lowest layer of supporting material with a router to
allow the existing clips to fit. This will weaken the mounting just a
bit but since a top-mount sinks will be pretty well glued into place by
the caulking that shouldn't be too much of a problem.

Actually I'm surprised that there is a problem though -- the coutertops
I built have 3/4" ply sandwiched with 1/2" ply sandwiched with
backerboard and then covered with ceramic tile and the standard clips
that came with the Koehler cast iron sink fit with no problem.
--
John McGaw
[Knoxville, TN, USA]
http://johnmcgaw.com