Minibearings Closures - Bearings - Technical Information

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Minibearings Closures - Bearings - Technical Information

Bearing Closures (Seals / Shields)

Seals and shields are situated between the inner and outer rings of the bearing. The purpose of seals and shields are to protect the inside of the bearing from contaminants and to help prevent the leakage of lubricant from the bearing.

Shields are made from steel or stainless steel. Shields do not contact the inner ring of the bearing and therefore do not increase the running torque. Shields can be either crimped into the inside of the outer race (type ZZ) or held in the outer race by circlips (type ZZS). The ZZS type are removable to allow inspection and maintenance of the bearing. RMB Filmoseal is a type of shield which utilises a film of lubricant between the inner race and the specially designed shield to more effectively exclude contaminants.

Seals are usually made from nitrile. Seals are either contact (type 2RS) or non-contact (type 2RU). Contact type seals which are secured within the outer race and contact the inner race greatly increase start up and running torque, thereby reducing running speed. They also provide a very effective method of excluding contaminants and retaining the bearing lubricant. Non contact seals have minimal contact with the inner race. They provide very effective sealing whilst allowing the bearings to operate at higher speed than contact sealed types. Standard Nitrile seals have a maximum recommended temperature of 100^o Celsius (212^o fahrenheit). Some bearings are also available with PTFE seals offering very effective sealing whilst minimising torque. PTFE seals can operate at temperatures up to 300^o Celsius (572^ofahrenheit). Note however that whilst the seals can withstand these temperatures the bearing itself will need special treatment if it is to be used at any temperature greater than those shown in our materials section. For special orders, Viton seals may also be available (temperatures up to 230^o Celsius (446^o fahrenheit).

Viton seals may also be available for special orders. Viton seals can withstand temperatures up to 230^o Celsius (446^o fahrenheit). Viton seals are usually used with Stainless Steel bearings and a high temperature grease (such as Mobiltemp SHC32 100) to ensure maximum performance. However, the temperature range of the viton seal extends well beyond the recommended temperature range of the Stainless Steel bearing material, so operating temperature will be restricted to that of the bearing material.


Open	Sealed	Shielded

You can purchase MBA product from any of our Distributors or online from Small Parts and Bearings.

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Miniature Bearings Main Pages

Technical Index

Product Technical Information

Balls	Bearings	Couplings
Pins	Shafting	Timing Belts and Pulleys

Other Technical Information

Basic Information Sheets	Catalogues	Glossary of Technical Terms
Links to Further Information	Materials Information	Measurement Conversions
Skate Bearing FAQ	Technical Information Sheets

Tables and information on this web site should be read as a general guide only. The relevant standards should be consulted to ensure accuracy

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Site Summary:

Miniature Bearings Australia offers over 100,000 products including small bearings, timing pulleys, timing belts, seals, o-rings, gears etc - see the full listing in the Online Catalogue. Our main business is through resellers including the online only distributor Small Parts and Bearings and the counter sales distributor H.E. Supplies (Hobby Engineering Supplies). Small Parts and Bearings online sales are located within our building in Dividend Street Mansfield. H.E. Supplies are located just around the corner at 186 Wecker Road Mansfield. There are many other distributors located throughout Australia and Worldwide so there are hundreds of places to buy our product. Using the links at the top of this page you will find extensive information including catalogues (Products and Store link), technical data, and other product specific information.

We sell our product worldwide through distributors. If you are a distributor of mechanical parts such as bearings and power transmission products, and you have an interest in becoming a distributor for Miniature Bearings Australia in your area/country please contact sales@minibearings.com.au with information about your company. Miniature Bearings Australia are a wholesale and OEM supply company only. There are some foreign language introductory pages in French, German, Italian, Chinese, Japanese, Spanish and Portuguese available on our site.

If you wish to purchase product online, the Small Parts and Bearings online store is linked directly to the Miniature Bearings Australia online catalogue, so all new MBA products are added automatically to their store. Recent additions include full ceramic bearings in Silicon Nitride and Zirconia, and ceramic hybrid bearings for pushbikes and other applications. New products are being added every week. We also suggest that you may want to take a look at the technical information sites - Shafting Information, Couplings Information, Gearboxes Information and General Engineering Parts Information.

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