TRO Expansion speed nut
The TRO Expansion speed nut is a self-locking nut which is both
very safe and very resistant to vibration. It was designed specifically
for blind assemblies which are only accessible from one side and can
be mounted in the centre or around the edge of a panel.
It is also widely used in the assembly of rigid structures with open or
tubular frames. It can be front-mounted easily with a little pressure and
thanks to a slight step built into the body of the nut the distance between
panels is avoided.