known and as stated under the heading u201c technical background of the invention u201d sub sea clamp connectors are applied for attaching sub sea assemblies a clamp connector 14 best shown in fig2 a of this kind has three arc shaped links 14 u2032 hingedly connected to each other each link 14 u2032 is made up by a pair arc shaped link pieces placed in parallel a distance apart from each other and connected by pivot pins providing the hingedly connection between the respective links 14 u2032 such clamp connectors when activated forces two pipe flanges axially towards each other the activation takes place by turning a jack screw by use of a conventional torque tool the jack screw 15 best shown in fig4 a is simply a heavy gauge bolt with external threads through most of its entire extension and terminates in a square or hexagon bolt head normally not wider than the bolt shaft as stated above such clamp connectors 14 are generally of a two hinged 14 u2033 construction with three links 14 u2032 and can be opened up to be withdrawn from a pipe joint or closed to be tightened around the pipe joint the connector 14 is able to retain a metal to metal seal intended to be located between the pipe flanges the jack screw 15 passes through a centrally located seal plate and transversally extending blocks arranged on respective clamp connector link ends with the blocks facing each other when the clamp connector is closing one of the blocks has internal left hand threads while the other is provided with internal right hand threads which engage with corresponding threads on the jack screw 15 the jack screw 15 is rotatable in the seal plate but still retained by the plate this is.