Coupling description The POLY-NORM® coupling is a torsionally flexible, shear type shaft   coupling. It has an axial plug-in design with a unique short over all   length. The POLY-NORM® can be used in nearly all types of machinery and   is ideal for the pump industry. The POLY-NORM® coupling compensates for shaft misalignment of all kinds and safely transmits the torque. Function The coupling consists of two hubs, with fingers separated by   elastomeric elements. The hubs are assembled blindly plugging the hub   fingers into each other axially and the elastomer ring is trapped in a   groove between both coupling hubs. The compact POLY-NORM® coupling   transmits torque with the elastomer in compression. Shaft misalignments,   vibrations and shock loads are effectively absorbed by the POLYNORM ®. The coupling is maintenance-free and used in general machinery, the   pump industry and in compressors. Torques of up to 26,800 Nm are stocked   in 17 different sizes and 7 designs. In addition to the standard   coupling models, flange drop out center and spacer options are available   in many variations.   Explosion protection use POLY-NORM® couplings are suitable for the use in drives in   hazardous areas. The couplings are certified according to EC Standard   94/9/EC (ATEX 95) and belong to category 2G/2D, are confirmed and thus   suitable for the use in hazardous areas of zone 1, 2, 21 and 22. Please read our information in the respective Type Examination   Certificate and the operating and mounting instructions under   www.ktr.com.   Variaition of options The coupling can be adapted to many applications due to the many   options that are possible with the building block arrangement. The   POLY-NORM® components of a given model can be mixed and matched with   each other to obtain different shaft distances using the same basic   component. On request, we can provide customized variations of the POLY-NORM® to   fit your needs – for example, our POLY-NORM® overload coupling with   RUFLEX® torque limiter. Just ask us!