iglidur® K - Material data

The most important specifications at a glance

iglidur® K is characterised by its good wear characteristics at low moisture absorption and good thermal and mechanical specifications. This supports a very universal application spectrum.

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: 0.06 - 0.21µ
Wear resistance under water	- 🟧 🟧 ⬜️ ⬜️ ⬜️ +
Media resistance	- 🟧 🟧 🟧 ⬜️ ⬜️ +	More information on media resistance
Resistant to edge pressures	- 🟧 🟧 🟧 ⬜️ ⬜️ +
Resistant to shock and impact loads	- 🟧 🟧 🟧 ⬜️ ⬜️ +
Dirt resistance	- 🟧 🟧 🟧 🟧 ⬜️ +

When should I use it?

If you are looking for a cost-effective all-round plain bearing
If it is to be used in a damp environment
When good wear resistance up to medium loads is required

When should I not use it?

When the highest wear resistance is required -> iglidur W300
When the highest media resistance is required -> iglidur X6
When a high-temperature bearing is required -> iglidur H

Download data sheet

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 +100°C upwards. Additional protection is required at temperatures higher than +70°C.

min. application temperature	Upper application temperature, long-term	Upper application temperature, short-term	In addition secure axially from
-40°C	+170°C	+240°C	+70°C

Permissible surface speeds

iglidur K has been developed for low to medium surface speeds. The maximum values specified in the table can only be achieved with low pressure loads. At the given speeds, friction can cause a temperature increase to maximum permissible levels. In practice, though, this level is rarely reached due to the interactions of varying conditions.

Sliding speeds of different iglidur materials

Information on the pv value and lubrication

Maximum surface speeds [m/s]	Rotating	Oscillating	linear
Permanent	1.0	0.7	3.0
Short-term	2.0	1.4	4.0

Permissible pv values

pv value, max. (dry):

0.3 [MPa·m/s]

Mechanical properties

The compressive strength of iglidur K plain bearings decreases with increasing temperatures. Diagram 02 illustrates this relationship. The maximum recommended surface pressure represents a mechanical material parameter. Conclusions about the tribology cannot be drawn from this. Diagram 03 shows the elastic deformation of iglidur K under radial loads. Under the maximum recommended surface pressure of 50MPa, the deformation is less than 3%. Possible plastic deformation depends, among other things, on the duty cycle of the load.

Diagram 02: Maximum recommended surface pressure as a function of temperature (60MPa at +20°C)

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

Diagram 03: Deformation under pressure and temperatures

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

Friction and wear

Like the wear resistance, the coefficient of friction μ also changes with the load (diagram 04 and 05).
Coefficients of friction for iglidur K against steel (Ra = 1μm, 50HRC):

iglidur K	dry	Greases	Oil	Water
Coefficient of friction µ	0.06 - 0.21	0.09	0.04	0.04

Shaft materials

Friction and wear are also dependent, to a large degree, on the mating partner. Shafts that are too smooth increase both the coefficient of friction and the wear of the bearing. For iglidur K, a ground surface with an average surface finish Ra = 0.15-0.2µm is recommended. Diagram 06 shows results of testing different shaft materials with plain bearings made from iglidur K. It is important to note that with increasing loads, the recommended hardness of the shaft increases. The "soft" shafts tend to wear more easily and thus increase the wear of the overall system, if the loads exceed 2MPa. The comparison of rotation and pivoting shows that the wear is almost identical at a pressure up to 5MPa. The higher the loads, the greater the difference (diagram 07).

Further information on shaft materials

Diagram 07: Wear in oscillating and rotating applications with Cf53 as a function of pressure

X = pressure [MPa]
Y = wear [μm/km]

A = rotating
B = oscillating

Installation tolerances

iglidur K 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 being assembled into a nominal size housing, the inner diameter automatically adjusts to the E10 tolerances. In relation to the installation tolerance, the inner diameter changes with the absorption of humidity.

Important tolerances according to ISO 354-7 after press-fitting:

Diameter d1 [mm]	Shaft h9 [mm]	iglidur K E10 [mm]	Housing H7 [mm]
up to 3	0 - 0.025	+0.014 +0.054	0 +0.010
> 3 up to 6	0 - 0.030	+0.020 +0.068	0 +0.012
> 6 up to 10	0 - 0.036	+0.025 +0.083	0 +0.015
> 10 up to 18	0 - 0.043	+0.032 +0.102	0 +0.018
> 18 up to 30	0 - 0.052	+0.040 +0.124	0 +0.021
> 30 up to 50	0 - 0.062	+0.050 +0.150	0 +0.025
>50 to 80	0 - 0.074	+0.060 +0.180	0 +0.030
>80 to 120	0 - 0.087	+0.072 +0.212	0 +0.035
> 120 up to 180	0 - 0.100	+0.085 +0.245	0 +0.040

Moisture absorption

The moisture absorption of iglidur K plain bearings is around 0.1% in standard climatic conditions. The saturation limit in water is 0.6%. These values are so low that consideration of swelling due to moisture absorption is only necessary in extreme cases.

Maximum moisture absorption (at +23°C/50% room humidity):

0.1% by weight

max. total moisture absorption:

0.6% by weight

Chemical resistance

iglidur K plain bearings are resistant to diluted alkalis and very weak acids as well as fuels and all types of lubricants. The low moisture absorption also allows use in wet or damp environments.

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