On Sun, 08 Feb 2015 14:36:23 +0000, MM wrote:

I have a domestic paper guillotine (BABS Premier 14) that I want to fix
to a wooden shelf. There is a flange each side with a hole on each
corner. Previously, I just used M6 bolts and nuts through the holes and
the shelf, but now I want to hang drawers underneath the shelf and the
bolts/nuts would get in the way.

Hence my idea of using spire nuts like the ones used extensively in the
auto industry. I'd drive Posidrive screws from underneath the shelf into
the spire nuts. If the screw heads were countersunk, they would not get
in the way of the drawers at all.

But thinking back to my days as a motor fitter, these spire nuts were
intended for *body panel* steel, which isn't very thick. The steel
flanges on the guillotine are 2.5mm thick. Is that too thick for a spire
nut?

I had to do something similar recently. I used (in my case M8) coach
bolts from underneath, a slight recess being necessarily to clear the
dome of the head. Then M8 nuts on the top.

Had to cut the coach bolts down as most of them come in a good deal
longer.
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