www.jbj.co.uk/torque-limiting-couplings.html 30 #DriveLineHarmony Torque Limiting Couplings LF Torsional Coupling Supplement Assembly notes and instructions - important notes For optimum coupling performance and longevity, the radial and axial screws connecting the element to the hubs or adapter plate must be tightened to the torque given in the table below. It is recommended that a torque wrench be used. This is particularly important with larger couplings. Tightening "by feel" is normally not sufficient. Tightening torques which are too low will inevitably lead to slackening of the screws and consequently lead to undesirable results. In order to reduce friction between the screw head and the metal insert in the element, it is suggested that a small amount of grease be applied to the underside of the screw head before assembly. This also reduces the possibility of twisting the element (see diagrams below). It is important that the element be mounted correctly and not be twisted. Mounting screw data Correct radial Incorrect radial axial radial S-Style Axial Screw Standard Radial & Axial Screw Coupling size DELFLEX Radial and axial screws Screw size Thread pitch Quantity Torque [Nm] LF1 M6 1.00 4 10 LF2 M8 1.25 4 25 LF4 M8 1.25 6 25 LF8 M10 1.50 6 50 LF12 M10 1.50 8 50 LF16 M12 1.75 6 90 LF22 M12 1.75 8 90 LF25 M14 2.00 6 140 LF28 M14 2.00 8 140 LF30 M16 2.00 6 220 LF50 M16 2,00 8 220 LF80 M16 2,00 8 220 LF90 M20 2.50 6 500 LF140 M20 2.50 8 500 LF250 M20 2.50 12 500 Mounting screws Each radial and axial mounting screw is treated for corrosion resistance (minimum grade DIN 8.8, SAE Grade 8) and the threads are coated with micro-encapsulated adhesive. The adhesive is released at assembly and further enhances the performance and safety of the coupling. For adequate effect, the adhesive should be allowed to harden for 4 to 5 hours prior to operation. NOTE: Anaerobic adhesives (such as LoctiteTM, etc) should NOT be used, as they have a detrimental effect on the bond between the rubber and the insert if dripped or splashed to those areas. Recommended adhesives are 3MTM 2353 or Nylok Precote 80. Screws that we provide with this adhesive may be used up to 3 times. axial axial
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