The Oil Seal size is typically specified by three common dimensions: the rotating shaft diameter (sometimes referred to as the inside diameter of the seal), the housing bore diameter (sometimes referred to the outside diameter of the seal), and the width (thickness) of the seal itself. Because of an oil seal’s purpose, size is critical. The inside diameter of Oil seal must always be slightly smaller than the shaft diameter in order to seal lubricants inside and prevent harmful contaminants from entering.
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