This specification covers the requirements for 95 KSI Fsu bimetal titanium rivets. Classification. Rivets furnished under this specification shall be of the followings types: Type I ?C Rivet@ titanium@ bimetal@ 95 KSI Fsu protruding head. Type II ?C Rivet@ titanium@ bimetal@ 95 KSI Fsu full flush crown head. Type III ?C Rivet@ titanium@ bimetal@ 95 KSI Fsu reduced flush crown head.