FAQ – Frequently Asked Questions

Find the answer to your question!

If you don't find the answer to your questions here, please contact us under the phone number +49 (0) 5207 92917-0 or by mail to info@kugellager-express.de respectively contact form.

Questions as regards the maintenance of the bearings
  • Is a certain loss of grease on my closed bearings usual?

    Yes, during grease lubrication only a small quantity of grease, which gives off the necessary quantity of oil continuously for lubricating the running surfaces, is involved in the lubrication process. The remaining part of the grease, which is unnecessary for the lubrication, accumulates on the sides or leaves the bearing.

    For example for applications where a high rotational speed is reached, a low filling of lubricant is enough. Here, a self-regulation takes places with the regular quantity of the lubricant. As long as the ideal lubricant content is reached, a loss of grease is possible.

Order & Delivery
  • Is there a catalogue or price list?

    You can get an overview of our articles by activating the red button named "articles table".
  • Are there price benefits in case of substantial purchase quantities?

    Yes, you find the price-quantity-scale to the respective article below on the left side of the article pages.
  • Can I also place an order with you as a private customer?

    Yes, our offer is either aimed at companies or private customers.
  • How long lasts the delivery?

    Most parcels and letters are carried out in Germany within 1 to 2 working-days. Shipments within the territory of the EU have a standard delivery time of 2 to 5 working-days. Internatoinal supplies outside the EU may last longer depending on the destination country.
  • Is there an international express delivery service?

    Kugellager-Express offers fast shipping methods for international customers.
     
  • By which shipping company is the article dispatched?

    This depends on the weight and size of your order. Find more information under: Modes of payment & shipping charges.
  • What are the bank details of Kugellager-Express?

    Holder of account: Kugellager-Express GmbH
    IBAN: DE16480700240024612400
    BIC/SWIFT: DEUTDEDBBIE

    Please quote your order number under the intended purpose.

Questions about bearing specifications
  • Which type of seal should I choose?

    For choosing an optimal seal, the area of application, in which the bearing should be used, has to be taken into account. So, a generalized statement can not be made. To decide, which seal variant is appropriate for your application, you can follow our info sheet about sealings.

    Find an overview of different seals and their pros and cons here.

  • Can bearings made of stainless steel be magnetic?

    Yes, depending on the atomic structure stainless steel can be magnetic. The so-called martensitic and ferritic chrome steel are magnetisable, austenitic stainless steel is generally not magnetisable.

    To guarantee formability with high temperatures, nickel and manganese will be added to industrial stainless steel. This is the reason why industrial stainless steel is often magnetisable. The load carrying capacity of bearings made of stainless steel is lower than the load carrying capacity of bearings made of chrome steel. Compared to austenitic steel, which isn't magnetisable, martensitic steel can be hardened. Thus a higher load carrying capacity can be achieved, which matters at many applications where bearings are used.

    Magnetism isn't in correlation to corrosion resistance. You will find further information regarding corrosion resistance here.

  • Are bearings made of stainless steel 100 per cent corrosion-resistant?

    The difference between unalloyed steel and rust-free stainless steel is the percentage of chrome of at least 10.5 % which is included in stainless steel. Due to the percentage of chrome, a thin layer will be formed by contact with oxygen on the surface of the steel. This layer is called passive layer, which protects the base material against corrosion. If the passive layer is however damaged by external influences, corrosion will develop. Contrary to the general opinion, stainless steel is 100 per cent rust-resistant, a process of rusting is according to this explanation very well possible.

    Some factors accelerate the development of corrosion on bearings made of stainless steel:

    • For example the contact with rust film can lead to a damage of the passive layer
    • For example an oxygen- poor or an oxygen-free environment: Here, the passive layer can form itself again and guarantee the corrosion protection. When choosing the material, it is absolutely necessary to consider in which environment the use will take place.
    • For example wrong bearing handling: It is absolutely necessary to avoid the cleaning with aggressive acids or steel wool.

    Tip: Also bearings made of stainless steel require maintenance and if necessary softly superficial cleaning with a rag to avoid corrosion.

References to simple processes around bearing mounting and dismounting
  • How is the correct mounting position of my angular ball bearings constructed?

    Single row angular ball bearings can absorb axial loads in one direction only. In the area where the largest load appears, the bearing shoulder is more distinctive (inner ring with high bearing shoulder).— Thus, at the angular ball bearing the power transmission has to occur on the inner ring with high bearing shoulder (left picture). According to this, it is necessary to pay attention during the mounting of the angular ball bearing that side A is mounted in the direction of the load effect.

    Schrägkugellager von vorne
    Seite A
    3D-Ansicht-vorne
    Schrägkugellager von hinten
    Seite B
    3D-Ansicht-hinten
  • In which alignment do I mount my axial deep groove ball bearings?

    Single direction axial deep groove ball bearings, which are usable in case of strong axial loads in one direction, consist of a shaft washer, a housing washer and a ball-cage assembly.

    axialscheiben-einseitig
    Einseitig wirkendes Axiallager
    axialscheiben-einseitig-skizze
    Einseitig wirkendes Axiallager

    Double direction axial deep groove ball bearings, which are usable in case of axial loads in two directions, consist of a shaft washer, two housing washers and two ball-cage assemblies.

    axialscheiben-einseitig
    Zweiseitig wirkendes Axiallager
    axialscheiben-einseitig-skizze
    Zweiseitig wirkendes Axiallager

    Because of its construction, the bearings aren’t self-contained. The mounting of the bearings parts takes place separately and is therefore relatively easy.

    The inner diameter of the shaft washer is minimally smaller than the inner diameter of the housing washer. The shaft washer will be fixed on the shaft; the housing washer will be fixed on the housing. In case of one direction axial deep groove ball bearings, you have to pay attention that the shaft washer abuts against a shaft shoulder or an abutment ring.

    Thus, the shaft washer represents in some extent the inner ring of the bearing; the housing washer represents the outer ring of the bearing.

    The shaft washer and the housing washer shouldn’t be mixed during the mounting.

    As the inner diameter of the shaft washer and the housing washer differ only minimally, you should find out the dimensions with a calliper to detect clearly which one is the shaft washer respectively housing washer.

    Tip: Shouldn’t you have a calliper, you can manage it as follows: You need two pointed pencils in different colors and a piece of paper. Use one of the two washers as a pattern and retrace the inner diameter with one of the pencils. After that, put the second washer accurately fitting on the developed circle and retrace the inner diameter of this washer with the second pencil in another color. Now, you can detect more clearly which of the two washers is the shaft washer (smaller inner diameter) respectively housing washer (bigger inner diameter).

  • How do I align my insert bearing?

    Manual

    For housing bearings the inserts are adjustable and removable. You can adjust the position of the insert bearing by means of a round timber, round steel or a stable steel pipe.

    In the following Video (german audio) you can see an instruction to the exact appraoch.

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