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iglidur  J3                                                                                                                                                                                                              iglidur  J3
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          +90°C                                                                                                                                                                                                                   +90°C
          45MPa                                                                                                                                                                                                                   45MPa
                      Bearing technology | Plain bearings | iglidur  J3                                                             Technical data
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          Permissible surface speeds                         Installation tolerances                                                  100.0                                               0.25
          iglidur  J3 is also suitable for medium to high surface   iglidur  J3 plain bearings are standard bearings for shafts        10.0
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          speeds. The maximum values shown in table 03 can only   with  h-tolerance (recommended minimum  h9).  The                                                                       0.20
          be achieved at low pressures. At the given speeds, friction   bearings are designed for press-fit into a housing machined     1.0
          can cause a temperature increase to maximum permissible   to a H7 tolerance. After being assembled into a nominal                                                               0.15
          levels. In practice, though, this level is rarely reached due   size housing, the inner diameter automatically adjusts to   Surface pressure [MPa]  0.1                       Coefficient of friction [µ]
          to varying application conditions.                 the E10 tolerances. For particular dimensions the tolerance
          Surface speed, page 48                             differs depending on the wall thickness (please see product               0.01  0.001   0.01     0.1      1.0      10.0      0.10
                                                             range table). In relation to the installation tolerance, the                                                                      0        15       25       35       45
          Temperature                                        inner diameter changes with the absorption of humidity.                  Surface speed [m/s]                                Load [MPa]
          The temperatures prevailing in the bearing system also have   Testing methods, page 61                                    Diagram 01: Permissible pv values for iglidur  J3 plain   Diagram 05: Coefficient of friction as a function of the
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          an influence on the wear. With increasing temperatures,                                                                   bearing with a wall thickness of 1mm dry operation against    pressure, v = 0.01m/s
          the wear increases and this effect is significant when                                                                    a steel shaft at +20°C, mounted in a steel housing
          temperatures rise over +90°C. For temperatures over   Chemicals                      Resistance
          +60°C an additional securing is required.           Alcohols                             +                                    90                                                 1.6
          Application temperatures, page 53                   Diluted acids                     0 up to –                               80                                                 1.4
          Additional securing, page 53                        Diluted alkalines                    +                                    70                                                 1.2
                                                              Fuels                                +                                    60                                                 1.0
                                                                                                                                        50
          Friction and wear                                   Greases, oils without additives      +                                    40                                                 0.8         Free cutting steel   Cf53, hard chromed  304 stainless steel
          Similar to wear resistance, the coefficient of friction µ also   Hydrocarbons            +                                    30                                                 0.6    H.a. aluminium       HR carbon steel  High grade steel
                                                                                                                                                                                           0.4
          changes with the surface speed and load (diagrams 04   Strong acids                       –                                   20                                              Wear [µm/km]  0.2   Cf53 steel
                                                                                                                                        10
          and 05).                                            Strong alkalines                  + up to 0                            Load [MPa]  0                                         0.0
          Coefficient of friction and surfaces, page 51      All data given at room temperature [+20°C]                                    20    30   40   50   60    70   80   90
          Wear resistance, page 54                           Table 02: Chemical resistance                                            Temperature [°C]
                                                             Chemical table, page 1170                                              Diagram 02: Maximum recommended surface pressure as a   Diagram 06: Wear, rotating with different shaft materials,
          Shaft materials                                                                                                           function of temperature (45MPa at +20°C)           pressure, p = 1MPa, v = 0.3m/s
          The friction and wear are also dependent, to a large                 Rotating Oscillating   linear
          degree, on the mating partner. Shafts that are too smooth   Long-term  m/s  1.5   1.1        8.0                              10                                                 45
          increase both the coefficient of friction and the wear of the   Short-term  m/s  3.0  2.1   10.0                                                                                 40         rotating
                                                                                                                                                                                                      oscillating
          bearing. For iglidur  J3 a ground surface with an average   Table 03: Maximum surface speeds                                   8       +23°C                                     35
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                                                                                                                                                                                           30
          surface finish Ra = 0.1-0.3µm is recommended. Diagram                                                                          6       +60°C                                     25
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          06 shows that iglidur  J3 can be combined with various                   Dry    Greases Oil  Water                             4                                                 20
          shaft materials. Diagram 07 shows rotating and pivoting   Coefficient of friction μ 0.06-0.20  0.09  0.04  0.04                                                                  15
          applications in comparison. With higher load, the wear   Table 04: Coefficient of friction against steel (Ra = 1μm,        Deformation [%]  2                                 Wear [µm/km]  10
                                                                                                                                                                                            5
          increases more for rotating than for pivoting movements.  50HRC)                                                               0                                                  0
          Shaft materials, page 56                                                                                                         0   5    10  15  20  25  30  35  40  45             0   5   10  15  20  25  30  35  40  45
                                                                          Housing   Plain bearings   Shaft                            Load [MPa]                                         Load [MPa]
                                                              Ø d1 [mm]   H7 [mm]     E10 [mm]     h9 [mm]                          Diagram 03: Deformation under pressure and temperature  Diagram 07: Wear for oscillating and rotating applications
                                                              0-3       +0.000 +0.010 +0.014 +0.054 -0.025 +0.000                                                                      with shaft material Cf53 hardened and ground steel, as a
                                                              > 3-6     +0.000 +0.012 +0.020 +0.068 -0.030 +0.000                                                                      function of the load
                                                              > 6-10    +0.000 +0.015 +0.025 +0.083 -0.036 +0.000                      0.25
                                                              > 10-18   +0.000 +0.018 +0.032 +0.102 -0.043 +0.000
                                                              > 18-30   +0.000 +0.021 +0.040 +0.124 -0.052 +0.000                      0.20
                                                              > 30-50   +0.000 +0.025 +0.050 +0.150 -0.062 +0.000
                                                              > 50-80   +0.000 +0.030 +0.060 +0.180 -0.074 +0.000                    Coefficient of friction [µ]  0.15
                                                              > 80-120  +0.000 +0.035 +0.072 +0.212 -0.087 +0.000
                                                              > 120-180  +0.000 +0.040 +0.085 +0.245 -0.100 +0.000
                                                             Table 05: Important tolerances for plain bearings according               0.10  0.05  0.10  0.15  0.20  0.25  0.30  0.35
                                                             to ISO 3547-1 after press-fit                                            Surface speed [m/s]
                                                                                                                 ASEAN 09/2023   ASEAN 09/2023  Diagram 04: Coefficient of friction as a function of the

                                                                                                                                    surface speed, p = 0.75MPa

          190   3D-CAD, finder and service life calculation ... www.igus-asean.com/J3                                                                           Lubrication-free made easy ... from stock ... no minimum order quantity  191
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