The spherical ball of the standard spherical bearings is made of iglidur® W300, a material that distinguishes itself by the lowest coefficient of friction and extremely low stick-slip effect. The latter is particularly important in low loads and extremely slow movements.
Ductile, tough thermoplastic alloy
Very low coefficients of surface friction in dry operation
High holding times
Tough in high-frequency angular motions
Excellent wear resistance
Maintenance-free dry operation
Excellent resistance against chemicals
Suitable for rotary, oscillating and linear movements
Also suitable for soft shafts
The standard housing for the dimensional series E and K are made of igumid G, a highly impact-resistant, long-fiber reinforced polymer. For applications from +80°C to +200°C, the housing of the dimensional series E are made of iguton G.
Ideal friction partner for iglidur® W300 spherical balls
High mechanical stability
Shock- and impact-resistant
Resistant to corrosion
Temperature-resistant up to +200 °C
X = temperature [ºC]
Y = tensile strength in percentage [%]
Figure 02: Influence of temperature on the maximum tensile strength of igubal® rod end bearings
|Lower||-30 °C||-40 °C|
|Upper, long-term||+80 °C||+200 °C|
|Upper, short-term||+120 °C||+240 °C|
|Screw thread designation||Pitch [mm]|
|M 10 F||1,25|
|M 12 F||1,25|
|M 16 F||1,50|
|Alcohols||+ to 0||+|
|Fats, oils, without additives||+||+|
|Diluted acids||0 to -||+ to 0|
|Strong acids||-||+ to -|
|Nominal diameter [mm]|
|Gage drops||Gage hangs|
|0 to 3||x,01||x,05|
|> 3 to 6||x,02||x,07|
|> 6 to 10||x,02||x,08|
|> 10 to 18||x,03||x,10|
|> 18 to 30||x,04||x,12|
|> 30 to 50||x,05||x,15|
left: inadequate test tool, gage to short
right: wrong test tool, measuring slide
Tolerance testing with gage
igubal® bearing elements can be used without problems even in harsh environments. In moist or wet environments, the bearings are corrosion resistant, and resistant to weak acids and alkalines. The operating temperature is from -40 °C to +200 °C. Resistance to dirt and dust is outstanding.
The bearings of the igubal® bearing elements can be used without any seals, even in extremely contaminated conditions. This is true for fine dust as well as coarse dirt.
Parts of metal detectable igubal® polymer bearings can be verified as foreign particle with all common parameters used in the metal detection technology and thus ensure good food.
The load carrying capacity of the maintenance-free igubal® bearing elements is very high at normal ambient temperatures. igubal® bearing elements take up high forces and at the same time weigh only a fifth of the common metallic bearing housing. The excellent dampening properties arise as the plastic material of the two-piece bearing can absorb vibrations in contrast to steel.
In the application however properties specific to plastics such as temperature dependency and creep behavior have to be considered. Therefore in particular cases the load carrying capacity of the rod end bearings should be checked in a practical trial with high constant loads, with low load speeds and at higher temperatures.
An important advantage of the maintenance-free igubal® bearing elements is the fact that the fast rotary motions of the mounted shaft directly take place in the iglidur® W300 bearing ball. The advantage of this plastic/steel plain bearing is that high speeds can be achieved in dry operation. Taking the radial loads into account, maximum surface speeds up to 0.5 m/s rotating can be attained.
The angular movements of the spherical bearing in contrast take place on the spheroidal outer diameter of the bearing ball.
The maintenance-free igubal® bearing elements casually permit linear movements of the shaft.
igubal® bearing elements are used in the temperature range of -30°C to +80°C. The HT version can be used continuously at a temperature of +200°C. Table 02 shows the influence of temperature on the load capacity of the igubal® bearing elements.
Both the iglidur® W300 bearing ball and the igumid G housing are resistant against weak alkalis, weak acids as well as against fuels and all types of lubricants. The humidity absorption of igubal® amounts to about 1.3 Wt.-% in standard climatic conditions. The saturation limit in water is 6.5%. This should be considered according to environmental influences. The HT version can be used for a higher resistance to chemicals.
Self-aligning igubal® bearings are resistant up to a radiation intensity of 3 x 102 Gy.
The corrosion resistance of the igubal® bearing elements make them particularly suitable for outdoor use. igubal® bearing elements are permanently resistant against UV rays. A minor variation in the ball color (dark) through UV radiation and other atmospheric exposure do not influence the mechanical, electrical or thermal properties.
igubal® bearing elements can be used with different tolerances according to each application. They are designed with a large clearance in the standard product, which enables a secure operation even under high peripheral speeds. The bore of the inner ring has a tolerance according to E10. The shafts should have tolerances between h6 and h9. The tolerances are provided in the table. Please contact us in case you require lower or other bearing tolerances.
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