A high-temperature, low-thermal expansion fastener for joining low thermal expansion refractory materials includes a pin with an inset portion on the shank of the pin that forms a head-facing shoulder, at least one shell insert which is seatable about the inset portion, and an internally threaded member...http://www.google.com.au/patents/US4975014?utm_source=gb-gplus-sharePatent US4975014 - High temperature low thermal expansion fastener
