www.jbj.co.uk/couplings.html #DriveLineHarmony 43 Features Composed of two tapered rings, it is suitable for applications that require smaller dimensions. The table shows performance data for the following tolerances: shaft d h6 - hub seat H7 for d ≤ 40 mm and shaft d h8 - hub seat H8 for d ≥ 42 mm 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 2 locking device is not self-centering so it requires a centring base between the shaft and hub. Where optimum concentricity is required, a centring base with a width ≥ H is recommended. Axial displacement Application 1: When tightening the ring nut, there is no hub to shaft axial displacement. The values in the table are valid for application 1. Application 2: When tightening the ring nut, there is hub to shaft axial displacement. The M, F , P and P values increase by 28% compared to the values t ax w n shown in the table. 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® 2 device Where two or more SIT-LOCK® 2 locking devices are mounted in a row, the total transmissible torque M is: t 1 device M = M indicated in catalogue t t 2 devices M = M indicated in catalogue ∙ 1.55 t t 3 devices M = M indicated in catalogue ∙ 1.86 t t 4 devices M = M indicated in catalogue ∙ 2.03 t t SIT-LOCK® 2 split version The SIT-LOCK® 2 is available in a split version on request. In this case, consider the table force P equal to 0. 0 ® Considering that using the SIT-LOCK 2 model requires tight tolerances, precise surface finishes, and additional accessory costs (flange, screw ® threads), we recommend using SIT-LOCK 3. Calculating transmissible torque Mt where: P = total force given by the screws P ∙ N° of screws tot v P = force required to deform rings without splits 0 tg α = tangent to the angle of the rings. tg α = 0.3 μ = coefficient of friction. Value found to be 0.12 d = shaft diameter ® SIT-LOCK 2 Internal Locking Device - Not Self-centring W Sf ≥2H I Dmin d D H H1 M = P - P tot ₀ tg α + 2μ μ d 2 t Table for determining the P v force depending on the M s value dg Axial force Pv in N Tightening torque Ms in Nm 8.8 10.9 12.9 8.8 10.9 12.9 M2,5 1.600 2.140 2.565 0,76 1,0 1,2 M3 2.210 3.110 3.730 1,3 1,9 2,2 M4 3.900 5.450 6.550 2,9 4,1 4,9 M5 6.350 8.950 10.700 6,0 8,5 10 M6 9.000 12.600 15.100 10 14 17 M8 16.500 23.200 27.900 25 35 41 M10 26.200 36.900 44.300 49 69 83 M12 38.300 54.000 64.500 86 120 145 M14 52.500 74.000 88.500 135 190 230 M16 73.000 102.000 123.000 210 295 355 M18 88.000 124.000 148.000 290 405 485 M20 114.000 160.000 192.000 410 580 690 M22 141.000 199.000 239.000 550 780 930 M24 164.000 230.000 276.000 710 1.000 1.200
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