BC Precision 608-ZZ Skateboard Bearing, 8x22x7, Shielded (Pack of 100)

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This 608-ZZ miniature radial ball bearing has double shields and a nylon cage, and conforms to the ABEC 1 precision standard. This bearing has an 8 mm bore diameter, a 22 mm outside diameter, and a 7 mm width. Its precision is rated at ABEC 1 by the Annular Bearings Engineers Committee (ABEC), allowing higher speeds and creating lower friction than less-precise ball bearings, and its radial internal clearance is C3 for radial slack between the inner and outer rings is greater than CN (normal) to compensate for thermal expansion. This bearing is made of ASTM International 52100 steel and heat treated to increase hardness for optimum wear resistance. Its deep ball grooves in both races support high radial and axial loads, its straight bore fits conventional cylindrical shafts, and its steel cage prevents the balls from coming into contact with each other during use, reducing friction, vibration, and noise. A no-contact steel shield on each side does not add friction or heat build-up during operation and protects against rough contaminants. This ball bearing is suitable for use in skate boarding, inline skating, and other skating applications. Rolling bearings use rolling elements to maintain the separation between moving parts to reduce rotational friction and support radial and axial loads. These elements can be one of the following types: ball, cylindrical, spherical, barrel, needle, spindle, or tapered. All rolling bearings are open, shielded, or sealed. Sealed bearings are lubricated with oil or grease in the bearing factory, while open and shielded bearings are meant to be lubricated in place, with periodic reapplication of lubrication, based on use. The shield protects the working parts of the bearing from environmental debris that may be introduced and could reduce the ball bearing speed and lifespan. Rolling bearings are used in a range of applications from agricultural machinery to conveying equipment, robotics, dental equipment, elevators, rolling mills, ship rudder shafts, and aggregate crushers, among others.