SKF Miniature Ball Bearing 638/4-2Z Metal Shielded
Miniature ball bearings are one of the most commonly used bearings within many different industries. Metal shielded type miniature bearings are manufactured with metal shields which are inserted into the outer raceway and fit in closely to the inner race. The shields are designed to provide protection against the ingress of moisture, dust and other foreign matter and also serve to retain the pre-filled grease in the bearing. Shields can be removed for applications where only 1 shield is required.
