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iglidur  M260                                                                                                                                                                                                           iglidur  M260
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         +120°C                                                                                                                                                                                                                   +120°C
          40MPa                                                                                                                                                                                                                   40MPa
                      Bearing technology | Plain bearings | iglidur  M260                                                           Technical data
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          Permissible surface speeds                         Installation tolerances                                                  100.0                                               0.25
          iglidur  M260 has been developed for low to medium   iglidur  M260 plain bearings are standard bearings for                  10.0                                               0.20
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          surface speeds. The maximum values shown in table   shafts with h tolerance (recommended minimum h9). The
          03 can only be achieved at low pressures. At the given   bearings are designed for press-fit into a housing machined          1.0                                               0.15
          speeds, friction can cause a temperature increase to   to a H7 tolerance. After being assembled into a nominal
          maximum permissible levels. In practice, though, this level   size housing, the inner diameter automatically adjusts to    Surface pressure [MPa]  0.1                        Coefficient of friction [µ]  0.10
          is rarely reached due to varying application conditions.  the D11 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      0.00
                                                             range table).                                                                                                                     0        10       20       30       40
          Temperature                                        Testing methods, page 61                                                 Surface speed [m/s]                                Load [MPa]
          The temperatures prevailing in the bearing system also have                                                               Diagram 01: Permissible pv values for iglidur  M260 with a   Diagram 05: Coefficient of friction as a function of the
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          an influence on the wear. With increasing temperatures,                                                                   wall thickness of 1mm dry operation against a steel shaft at   pressure, v = 0.01m/s
          the wear increases and this effect is significant when   Chemicals                   Resistance                           +20°C, mounted in a steel housing
          temperatures rise over +80°C. For temperatures over   Alcohols                        + up to 0
          +80°C an additional securing is required.           Diluted acids                         –                                   40                                                 3.0
          Application temperatures, page 53                   Diluted alkalines                 + up to 0                                                                                  2.5
          Additional securing, page 53                        Fuels                                 –                                   30
                                                              Greases, oils without additives   0 up to –                                                                                  2.0
          Friction and wear                                   Hydrocarbons                         +                                    20                                                 1.5         Free cutting steel   Cf53, hard chromed  304 stainless steel
          Similar to wear resistance, the coefficient of friction μ   Strong acids                  –                                   10                                                 1.0    H.a. aluminium       HR carbon steel  High grade steel
          also changes with the load. The coefficient of friction   Strong alkalines            + up to 0                                                                               Wear [µm/km]  0.5   Cf53 steel
          decreases considerably with increasing loads, whereas a   All data given at room temperature [+20°C]                       Load [MPa]  0                                         0.0
          slight increase in surface speed causes an increase of the   Table 02: Chemical resistance                                       20    30     40    50    60    70    80
          coefficient of friction (Diagram 04 and 05).       Chemical table, page 1170                                                Temperature [°C]
          Coefficient of friction and surfaces, page 51                                                                             Diagram 02: Maximum recommended surface pressure as a   Diagram 06: Wear, rotating with different shaft materials,
          Wear resistance, page 54                                             Rotating Oscillating   linear                        function of temperature (40MPa at +20°C)           pressure, p = 1MPa, v = 0.3m/s
                                                              Long-term  m/s      1.5       0.7        8.0
          Shaft materials                                     Short-term  m/s     2.0       1.4        4.0                               4                                                 120
          The friction and wear are also dependent, to a large degree,   Table 03: Maximum surface speeds                                                                                  100        rotating
          on the mating partner. Shafts that are too smooth increase                                                                     3                                                 80         oscillating
          both the coefficient of friction and the wear of the bearing.            Dry    Greases Oil  Water                                     +23°C
                                                                                                                                                 +60°C
          For iglidur  M260 a ground surface with an average surface   Coefficient of friction μ 0.08-0.16  0.09  0.04  0.04             2                                                 60
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          finish Ra = 0.8µm is recommended. Diagram 06 shows a   Table 04: Coefficient of friction against steel (Ra = 1μm,              1                                                 40
          summary of the results of tests with different shaft materials   50HRC)                                                    Deformation [%]                                    Wear [µm/km]  20
          executed with plain bearings made of iglidur  M260. It                                                                         0                                                  0
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          is important to notice that with increasing loads, the          Housing   Plain bearings   Shaft                                 0.0       12.5     25.0     37.5     50.0           0   5    10  15   20   25  30   35  40
          recommended hardness of the shaft increases. The "soft"   Ø d1 [mm]  H7 [mm]  D11 [mm]   h9 [mm]                            Load [MPa]                                         Load [MPa]
          shafts tend to wear more easily and thus increase the   0-3   +0.000 +0.010 +0.020 +0.080 -0.025 +0.000                   Diagram 03: Deformation under pressure and temperature  Diagram 07: Wear for oscillating and rotating applications
          wear of the overall system, if the loads exceed 2MPa. The   > 3-6  +0.000 +0.012 +0.030 +0.105 -0.030 +0.000                                                                 with shaft material Cf53 hardened and ground steel, as a
          comparison of rotating and pivoting movements in diagram    > 6-10  +0.000 +0.015 +0.040 +0.130 -0.036 +0.000                                                                function of the load
          07 makes it very clear that iglidur  M260 plain bearings   > 10-18  +0.000 +0.018 +0.050 +0.160 -0.043 +0.000                0.25
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          are most suited for rotating operation.             > 18-30   +0.000 +0.021 +0.065 +0.195 -0.052 +0.000
          Shaft materials, page 56                            > 30-50   +0.000 +0.025 +0.080 +0.240 -0.062 +0.000                      0.20
                                                              > 50-80   +0.000 +0.030 +0.100 +0.290 -0.074 +0.000
                                                              > 80-120  +0.000 +0.035 +0.120 +0.340 -0.087 +0.000                    Coefficient of friction [µ]  0.15
                                                              > 120-180  +0.000 +0.040 +0.145 +0.395 -0.100 +0.000
                                                             Table 05: Important tolerances for plain bearings according               0.10
                                                             to ISO 2795 after press-fit                                                   0.05  0.10   0.15  0.20  0.25  0.30  0.35

                                                                                                                                      Surface speed [m/s]
                                                                                                                 ASEAN 09/2023   ASEAN 09/2023  surface speed, p = 0.75MPa
                                                                                                                                    Diagram 04: Coefficient of friction as a function of the



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