For a bed I'm not sure I'd use those...beds can be subject to a lot of
stress. Kids jumping on them, adults.....lets not go there in public.

I'd suggest hardware designed for beds. This may give an idea of what's
available:

I agree - beds can take a lot of weight and stress - I wouldn't want
all that relying on some small bolts. For the queen style bed I just
completed, I basically made my own fastening system: two 3/4" dowels
on each end of each rail to take the weight, and a 1/2" bolt going
through the post into a nut set into the rail to tighten the thing
together. Very similar to:
http://www.rockler.com/product.cfm?O...Select=Details
except with bigger bolts and dowels.
I looked at the "bed rail fasteners" here
http://www.rockler.com/product.cfm?page=10
but wasn't too impressed. The LV ones mentioned earlier look better,
or
http://www.leevalley.com/hardware/pa...=3,40842,41269
is another possibility (although I don't like the little brass covers;
I made my own "plugs" out of wood drawer pulls)
Rockler also has a variety of other bed rail fastening options, many of
which weren't available even a year or 2 ago. Check out
http://tinyurl.com/y3dl3n. For instance, if http://tinyurl.com/y2hf7m
were available when I was putting together my bed, I probably would
have used them (with bigger dowels).
Good luck,
Andy