MiniBearings 17 - Skate - Hobby Information

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MiniBearings 17 - Skate - Hobby Information

Skate Bearings - Question 17

What is the meaning of "Z" and "ZZ" in the bearing code?

Most brands use the designation "Z" to mean a steel shield covering the side of the bearing. "ZZ" simply means that the bearing has a shield on both sides. Normally, the shield itself will be branded as "608 Z" even though there is a shield on both sides of the bearing. This is for practicality in manufacturing. It is much more economical to produce all of the shields stamped as "608 Z" than it would be to manufacture the exact same component with "608 ZZ" stamped on the ones to be used for bearings with two shields. Some manufacturers supply bearings with removable shields, whilst others have shields that are crimped in place. Neither is usually better than the other unless you intend replacing the lubricant or cleaning the bearing from time to time (neither of which is recommended by the manufacturer).

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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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