I came across this site while searching other things. What caught my eye
was the "sex bolts". Apparently this is a "mating fastener". We have seen
them as a bolt thru type connector for furniture. But they have a huge
selection of this kind of fastener in various materials. As well as parts
for jigs, etc.
There are six different PDF catalogs listed on this page.
I am going to be looking these pages over carefully. I have a project
coming up that will require large DECORATIVE fasteners. Maybe a nice
shoulder bolt in stainless steel.....