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The 6218 ZZ bearing, as per its numerical designation, falls under the deep groove ball bearing category, a widely used type of rolling-element bearing. The '62' series denotes a metric bearing with a normal radial load capacity, while the '18' indicates the bore diameter in millimeters. The 'ZZ' suffix, however, is what sets it apart, signifying that the bearing has a shielded design on both sides. These shields prevent the ingress of dirt, dust, or other contaminants, ensuring a longer service life and improved operational efficiency.