- Lubricant (if recommended by the manufacturer)
Runout
Also known as a Rotary Shaft Seal, Shaft Seal, Lip Seal, Elastomeric Lip Seal or any variation of these. It is a simple device for excluding dust, dirt, water or any other contaminant whilst retaining lubricant in rotary shaft equipment. Generally, it has been developed as a means of protecting the bearings of rotating shafts.
CONVENTIONAL OIL SEALS
Rotary Wheel Of Auto Parts
Shaft Surface Finish
Update: Size
Agricultural vehicles from New Holland and Cagiva, among others
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Selecting the Right Spark Plugs for Motor Vehicles

With minor lip type Used for applications where there are contaminants, such as dust and foreign matter, on the air side face of the oil seal.
An oil seal is a type of mechanical seal used to prevent the leakage of oil from machinery components. The dimensions of an oil seal are usually specified in terms of its inner diameter, outer diameter, and thickness. For example, a 38x52x7 oil seal has an inner diameter of 38mm, an outer diameter of 52mm, and a thickness of 7mm.