HobbyParts 17 - Skate - Hobby Information

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HobbyParts 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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H.E. Supplies (Hobby Engineering Supplies) offers thousands of products including remote controlled cars, planes, boats, and helicopters. We stock spare parts for remote controlled models. Our range includes the popular Solarbotics solar model kits and spares. We also distribute the full range of miniature engineering products from Miniature Bearings Australia. This range includes small bearings, timing pulleys, timing belts, seals, o-rings, gears and more. Also available from our store in Mansfield Queensland are a full range of lubricants, adhesives, kites, balsa wood and plastic rod and sheet materials. See our Online Catalogue for more information. Our main business is handled from our sales counter and showroom at 186 Wecker Road Mansfield, Queensland, Australia, but we also sell by phone, fax, online and mail order. We offer all of our hobby parts through our online store and some of the more popular MBA items. If you would like to purchase other MBA items online, Small Parts and Bearings offer the full range in their online catalogue.

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