The metal case is the exterior (or frame) of the oil seal, the principal function of which is to give rigidity and strength to the seal. The material of the case must be selected depending on the environment where the seals are to be used. Often the metal case is covered by the same rubber material used in the sealing element, which also helps seal the exterior of the oil seal in the housing bore. Common case material types are:
In automotive applications, the proper functioning of oil seals is crucial for maintaining the performance and longevity of critical components. Trailer hub oil seals and Tora oil seals, among others, are essential for preventing oil leakage, minimizing friction, and protecting internal components from wear and damage. High-quality oil seals contribute to the overall efficiency, safety, and reliability of vehicles and machinery.

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NBR is recommended for the majority of standard applications and is the most commonly used rubber (elastomer) material. This is because of Nitrile's compatibility with most environments as well as its relatively low cost. Generally nitrile is used for disposable non-latex gloves, footwear, automotive transmission belts, synthetic leather, hoses, o-rings, gaskets, oil seals, and more.