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iglidur® J260 - material data

Table of contents

    The most important specifications at a glance

    Similar to the classic, iglidur J, iglidur J260 is an endurance runner with outstanding wear behaviour, but provides increased reserves at its long-term application temperature of +120°C.

    Descriptive technical specifications
    Wear resistance at +23°C- 🟧 🟧 🟧 ⬜️ ⬜️ +More information on wear resistance
    Wear resistance at +90°C- 🟧 🟧 🟧 ⬜️ ⬜️ +
    Wear resistance at +150°C- 🟧 🟧 ⬜️ ⬜️ ⬜️ +
    Slide property- 🟧 🟧 🟧 🟧 ⬜️ +Coefficient of friction, dynamic, against steel: µ 0.06 - 0.20
    Wear resistance under water- 🟧 🟧 ⬜️ ⬜️ ⬜️ +
    Media resistance- 🟧 🟧 🟧 ⬜️ ⬜️ +More information on media resistance
    Resistant to edge pressures- 🟧 🟧 🟧 ⬜️ ⬜️ +
    Resistant to shock and impact loads- 🟧 🟧 🟧 ⬜️ ⬜️ +
    Dirt resistance- 🟧 🟧 🟧 ⬜️ ⬜️ +

    When do I use this material?

    • When plastic shafts are used
    • If the temperature resistance of iglidur J is not sufficient
    • When a plain bearing with good coefficients of friction is sought
    • When high wear resistance up to medium loads is desired
    • When good universal media resistance is required

    When do I use a different material?

    • When high surface pressures occur -> iglidur Z
    • When temperatures permanently higher than +120°C occur -> iglidur J350
    • When the best possible universal wear resistance is required -> iglidur J

    Temperatures

    The temperatures prevailing in the bearing system also have an influence on bearing wear. Wear increases with rising temperatures, and the effect is particularly noticeable from a temperature of +80°C upwards. Additional protection is required at temperatures higher than +80°C.

    Temperatures, coefficient of thermal expansion

    min. application temperatureUpper application temperature, long-termUpper application temperature, short-termIn addition secure axially from
    -100°C+120°C+140°C+80°C

    Permissible surface speeds

    iglidur J260 has been developed for low to medium surface speeds. The maximum values specified in the table can only be achieved at low pressure loads. At the specified speeds, friction can lead to an increase up to the limit of the permanently permissible temperature. In practice, these limit values cannot always be achieved.

    Surface speeds of various iglidur materials

    Maximum surface speeds [m/s]RotatingOscillatinglinear
    Long-term1.00.73.0
    Short-term2.01.44.0

    Permissible pv values

    Diagram 01: Permissible pv values for iglidur® J260 plain bearing
    Diagram 01: Permissible pv values for iglidur® J260 plain bearing

    Diagram 01: Permissible pv value for iglidur J260 plain bearing with 1mm wall thickness in dry operation against a steel shaft, at +20°C, installed in a steel housing

    X = surface speed [m/s]
    Y = pressure [MPa]

    pv value, max. (dry)

    MPa - m/s

    0,35

    Information on pv value and lubrication

    Mechanical specifications

    The maximum recommended surface pressure is a mechanical material parameter. Conclusions about the tribology cannot be drawn from this. The compressive strength of iglidur J260 plain bearing decreases with increasing temperatures. Diagram 02 illustrates this relationship. Diagram 03 shows the elastic deformation of iglidur J260 under radial load. Under the maximum recommended surface pressure of 40MPa, the deformation is less than 2.5%. Possible plastic deformation depends, among other things, on the duration of the impact.

    Diagram 02: Maximum recommended surface pressure as a function of temperature (40MPa at +20°C)

    X = temperature [°C]
    Y = pressure [MPa]

    Diagram 03: Deformation under load and temperatures

    X = load [MPa]
    Y = deformation [%]

    Friction and wear

    Like the wear resistance, the coefficient of friction μ also changes with the load. Interestingly, the coefficient of friction decreases with increasing load, while an increasing surface speed causes a slight increase in the coefficient of friction (diagrams 04 and 05).

    Coefficients of friction against steel (Ra = 1μm, 50HRC):

    iglidur J260dryGreasesOilWater
    Coefficient of friction μ0.06 - 0.200.090.040.04

    Diagram 04: Coefficient of friction as a function of the surface speed, p = 0.75MPa

    X = surface speed [m/s]
    Y = coefficient of friction μ

    Diagram 05: Coefficients of friction as a function of the load, v = 0.01m/s

    X = load [MPa]
    Y = coefficient of friction μ

    Shaft materials

    Friction and wear are also highly dependent on the shaft material. Shafts that are too smooth increase both the coefficient of friction and the wear of the bearing. For iglidur J260, a ground surface with an average surface finish Ra = 0.8μm is best suited. Diagram 06 shows the results of the tests of various shaft materials with plain bearings from iglidur J260. In this context, it is important to note that the recommended hardness of the shaft increases with increasing load. The "soft" shafts are more prone to self-wear and thus increase the wear of the overall system when the load exceeds 2MPa. The comparison of rotation and pivoting in diagram 07 makes it very clear that iglidur J260 plain bearings show their strengths above all in rotational operation.

    Further information on shaft materials

    Diagram 06: Wear, rotating application with different shaft materials, p = 1MPa, v = 0.3m/s

    X = shaft material
    Y = wear [μm/km]

    A = aluminium, hard-anodised
    B = free cutting steel
    C = Cf53
    D = Cf53, hard-chromed
    E = HR carbon steel
    F = 304 SS
    G = high grade steel

    Diagram 07: Wear in oscillating and rotating applications with steel, Cf53, hardened, ground as a function of load

    X = pressure [MPa]
    Y = wear [μm/km]

    Chemical resistance

    iglidur J260 plain bearings are resistant to diluted alkalis, hydrocarbons and alcohols. The very low moisture absorption also allows its use in wet or damp environments.

    All data at room temperature [+20 °C],      + resistant      0 conditionally resistant      - non-resistant

    ChemicalsResistance
    Alcohols+ up to 0
    Greases, oils without additives0 to -
    Hydrocarbons+
    Fuels-
    Strong alkalines+ up to 0
    Strong acids-
    Diluted alkalines+ up to 0
    Diluted acids-

    Moisture absorption

    Influence of moisture absorption

    Diagram 10: Influence of moisture absorption

    X = moisture absorption [Gew.-%]
    Y = reduction of inner ø [%]

    The moisture absorption of iglidur J260 plain bearings is around 0.2% in a normal climate. The saturation limit in water is 0.4%. These values are so low that swelling due to moisture absorption can be disregarded.

    Maximum moisture absorption at +23°C/50% room humidity.
    0.2% weight.

    Maximum total moisture absorption
    0.4% weight.

    Installation tolerances

    iglidur J260 plain bearings are standard bearings for shafts with h-tolerance (recommended minimum h9). The bearings are designed for press-fit into a housing machined to a H7 tolerance. After installation in a housing with nominal dimensions, the inner diameter of the bearings with E10 tolerance adjusts automatically. For certain dimensions, the tolerance deviates from this depending on the wall thickness (see product range).

    Important tolerances according to ISO 3547-1 after press-fit:

    Diameter d1 [mm]Housing H7 [mm]iglidur J260 plain bearing E10 [mm]Shaft h9 [mm]
    up to 3+0.000 +0.010+0.014 +0.054-0.025 +0.000
    > 3 up to 6+0.000 +0.012+0.020 +0.068 -0.030 +0.000
    > 6 up to 10+0.000 +0.015+0.025 +0.083-0.036 +0.000
    > 10 up to 18+0.000 +0.018+0.032 +0.102-0.043 +0.000
    > 18 up to 30+0.000 +0.021+0.040 +0.124-0.052 +0.000
    > 30 up to 50+0.000 +0.025+0.050 +0.150-0.062 +0.000
    >50 to 80+0.000 +0.030+0.060 +0.180-0.074 +0.000
    >80 to 120+0.000 +0.035+0.072 +0.212-0.087 +0.000
    > 120 up to 180+0.000 +0.040+0.085 +0.245-0.100 +0.000

    Thermal conductivity

    [W/m · K] 0.24

    ASTM C 177

    Coefficient of thermal expansion

    (at +23°C) [K-1 · 10-5] 13

    DIN 53752

    Compressive strength

    50MPa

    Vacuum

    Any moisture present will degas in a vacuum. Use in a vacuum is only possible for dry bearings made from iglidur J260.

    Radioactive radiation

    Resistant up to a radiation intensity of 3 · 102Gy.

    Free sample box

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    Buy iglidur J260 products in the online shop

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    Go to igus online shop

    Typical application areas

    • Automation
    • Plant engineering
    • Test engineering and quality assurance
    • Robotics industry
    • Electrical industry

    Consulting

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