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Closures<br />
Ball bearing closures fulfil two tasks at the<br />
same time: firstly they prevent contamination<br />
and secondly they contain lubricants.<br />
Non-contact Closures<br />
Because of the proximity with the inner ring<br />
land the ball bearing closure forms an<br />
effective gap seal. It neither increases the<br />
torque nor influences the maximum speed<br />
compared with open ball bearings as the<br />
shields do not touch the inner ring. This is<br />
sufficient for most applications.<br />
Metal Shields<br />
The shields are stamped from stainless steel<br />
on the majority of ball bearings. They are<br />
fastened to the outer ring with a circlip and<br />
can thus be removed. Ball bearings can also<br />
be fitted with pressed-in shields made from<br />
deep drawing steel sheet.<br />
Rubber Closures<br />
The RZ closure is made of molded rubber with<br />
metal stiffener and can be used at temperatures<br />
from –30 °C to 120 °C. This closure is<br />
fastened in the outer ring by the rubber<br />
border.<br />
Rubber Seal<br />
The RS seal is made of molded rubber with<br />
metal stiffener and can be used at<br />
temperatures of -30 °C to 120 °C.<br />
The VS seal is made of molded viton with<br />
metal stiffener and is suitable for<br />
temperatures of -20 °C to 230 °C.<br />
Both seals are fastened in the outer ring by<br />
the rubber border.<br />
We would like to remind you that certain<br />
lubricants cannot be used with rubber. Please<br />
consult our technical support about difficult<br />
operating conditions.<br />
Special Closures<br />
In addition to the standard closures we also<br />
manufacture special closures and combinations<br />
of different closures. Please call our<br />
technical support.<br />
Seal with Inner Ring Contact<br />
This ball bearing seal touches the inner ring<br />
land. This causes an increase in torque.<br />
Teflon Seal<br />
The TS seal is made from glass-fibre<br />
reinforced Teflon which is fastened in the<br />
outer ring by a circlip.<br />
Teflon seals can be used at working temperatures<br />
of -240 °C to 300 °C. They prevent<br />
contamination. However an hermetic sealing<br />
cannot be achieved. The torque is lower than<br />
for rubber seals due to the favourable low<br />
friction combination (PTFE/Steel) and the low<br />
contact force of the sealing lip.<br />
TS seals are universally resistant to chemicals.<br />
The ball bearings are normally made from<br />
stainless steel, chrome steel can also be<br />
provided in appropriately large quantities.<br />
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