RADAX
On ESRANGE there are many starts of sounding rockets every year. Such sounding rockets consists of the nosecone, rocket motor and some rocket modules which are connected mechanically by using radax flanges on both sides. These flanges are working in radially and axially direction as well and they are fixed to the next flange by using many screws.
Every year in March we perform two sounding rocket starts as part of REXUS BEXUS programme (see rexusbexus.net and https://en.wikipedia.org/wiki/Rexus_and_Bexus)
Inside the cache box you will find such RADAX screws which are already used on REXUS missions. So please feel free to take a "space screw" which was already in space and back on earth.