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The designation 20x35x7 refers to the dimensions of the oil seal. The numbers represent the inner diameter (20 mm), outer diameter (35 mm), and the thickness (7 mm) of the seal. The design of an oil seal is critical, as it must fit precisely to ensure a proper seal and prevent the ingress of dirt, dust, or moisture. The choice of material used for these seals often includes rubber compounds that enhance flexibility and resilience. Common materials include nitrile rubber (NBR), fluorocarbon rubber (FKM), and silicone, each chosen based on the specific application and operating conditions.

Rotary lip seals are employed in a wide array of industries, including automotive, aerospace, manufacturing, and agriculture. In automotive applications, they are commonly found in engines, transmissions, and wheel hubs, where they play a vital role in ensuring the longevity and efficiency of the vehicle. In hydraulic systems, these seals prevent fluid leakage, ensuring that equipment operates smoothly and effectively.