Material: Housing made of aluminium alloy with iridite NCP finish. Inner hub made of steel. As sliding hub for a driving wheel, for concentric arrangement. The driving wheel hasto be mounted and bonded by the customer on the outer diameter 21.97mm +0/-0,02mm. The construction is simple and basically consists of 4 or 6 clutch plates which are connected to the inner hub and held by the outer housing. Max. slip-speed 1000 rpm. Torsional backlash of the coupling below 2°. Torque range with 2 friction plates 2.4 Ncm to 53.8 Ncm. Torque range with 6 friction plates 7.8 Ncm to 132.4 Ncm. Maximum operating temperature 80°C. An adjusting ring - screwed to the outer body - serves to adjust the torque. Two sintered bearing sleeves serve as bearing housing to inner component. An O-ring seals the hub off against dirt.