www.jbj.co.uk/couplings.html #DriveLineHarmony Introduction ® SIT-LOCK 30 Monolock 83 Features Composed of a single cylindrical ring in which a tapered hole is cut. A special screw with a tapered surface is inserted into the tapered hole. The screw is of quality 12.9 in order to allow the tightening torques indicated in the tables. By tightening the screw to the tightening torque M indicated in the table, a pressure is generated on the shaft and hub. This pressure allows to transmit s the torque Mt indicated in the table. The indicated and values are valid for dry surfaces. X M F t A Applications with simultaneous M torque and F axial force t ax In applications where and are simultaneously present, the value of transmissible torque decreases. Below is the formula for calculating the total X M F t A torque: 2 d 2 M = M + (F • ) tam t AXR 2000 M = total torque (Nm) tam M = required torque (Nm) t F = required axial force (N) AXR d = shaft diameter (mm) Axial displacement When tightening the screws there is no hub to shaft axial displacement. Surface finish Normal surface finish is sufficient. The following values are recommended: R ≤ 3,2 µm - R ≤ 16 µm. a t Tolerances The following tolerances are recommended: Shaft d h8 - hub seat D H8. Installation Clean the inner and outer contact surfaces of the locking device, shaft and hub contact surfaces thoroughly. Remove any traces of oil from the contact surfaces of the components. Mount the shaft, hub and locking device in the desired position and then tighten the screw to the M torque s shown in the table. Removal Loosen the clamping screw. No additional operations are necessary. Reusing the locking device When reusing the locking device, check all the surfaces are clean and show no obvious signs of deformation or seizing. Clean the surfaces of the locking device. Check the screw for deformation. Assemble the locking device in their original places. Benefits Quick and easy assembly and disassembly » Quick installation and removal » Economical » Compact dimensions. » Recommended for the connection of: Timing pulleys » Sprockets » Levers » Cams » Gears »
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