www.jbj.co.uk/couplings.html #DriveLineHarmony 18 Features Composed of two tapered rings and one outer ring with a split. It is particularly suitable for applications that require high torque transmission. The table shows performance data for the tolerances: shaft d h8 - coupling seat on hub H8 Do not use molybdenum disulphide-based oils or greases that reduce the coefficient of friction . The values in the table are calculated with 0.12 m m Hub to shaft centring The SIT-LOCK® 4A locking device is self-centering so it does not require a centring base between the shaft and hub. This allows for hubs with reduced widths which saves on materials and leads to reduced costs. Installation with non-lubricated surfaces (dry) ® The SIT-LOCK 4A locking device is lubricated with oil before delivery to protect it from oxidation during storage. The values shown in the table have been calculated for applications with oiled contact surfaces. For dry installation, the values are: Mt , Fax +5% Pw , Pn -16% To get these values, the locking device must be completely disassembled and all component surfaces must be cleaned with solvent. The shaft and hub contact surfaces must also be completely dry. Axial displacement When tightening the screws there is no hub to shaft axial displacement. Radial loads ® The SIT-LOCK 4A locking device is suitable for applications subject to high radial loads. For further information, please contact the jbj Techniques Limited technical office, telephone: +44 (0)1737 767493 or email: info@jbj.co.uk Surface finish Normal surface finish is sufficient. The following values are recommended: R ≤ 3.2 μm - R ≤ 16 μm a t ® Applications with more than one SIT-LOCK 4 device ® Where two SIT-LOCK 4 locking devices are mounted in a row, the total transmissible torque M is: t 2 devices M = M indicated in catalogue ∙ 1.9 t t Installation The locking device is supplied ready to assemble. Clean the shaft contact surfaces thoroughly and apply oil. Mount the shaft, hub and locking device in the desired position. Screw tightening sequence: Tighten four screws crosswise until the locking device surfaces make contact with the shaft and hub. Tighten all screws to 50% of the screw tightening torque value Ms indicated in the table in a ‘criss-cross’ sequence. Repeat to 100% of the M tightening torque indicated in the table. In continuous sequence, check s that the tightening torque M has been achieved. Installation is complete when all screws are tightened to the M tightening torque indicated in the table. s s ® SIT-LOCK 4A Internal Locking Device - Self-centring D d Dmin D d H H1 H2
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