SmallParts 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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Small Parts and Bearings 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 handled primarily through our internet store or via phone, fax or mail order. To keep our prices low we have minimised overheads by not having a storefront. If you would like to deal through an MBA distributor with a showroom and counter service you can contact H.E. Supplies (Hobby Engineering Supplies).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 our online store and have quite low overseas freight rates.
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