R+W's BKC model series of torsion-proof coupling has established itself on the market. A shorter BKM model series will once again be available to users in 2009. The compactness of this model has been made possible by the 2-corrugation inside the metal bellows. The coupling’s small external diameter in relation to the torque transmission level is also new. This new development allows the size of the coupling housing to be reduced from 160 to 112mm.