Basic Things You Should Know About Oil Seals

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Basic Things You Should Know About Oil Seals

Jul. 15, 2022

Oil seals play a crucial role in all rotating and moving part assembly as they act as a physical barrier to retain lubricants, whilst excluding dirt, moisture and other contamination. They are manufactured in a wide range of sizes and specifications to meet several demanding sealing applications across industries. This post, which has two parts, discusses some of the must know things about oil seals. Read on to understand the seals better!


General Features of Oil Seals


Designed to offer optimum sealing performance, oil seals guarantee extreme durability even under high-peripheral speed. They are light-weight, compact, and exhibit high self-lubricating performance. As oil seals are manufactured using high-grade materials, they last long without showing the signs of any kind of hardening, softening or ageing.


Auto oil seal


Types of Oil Seals


As mentioned earlier, oil seals are available in varied designs to best match the applications. A few of the commonly available types include:


ㆍType A single lip rubber coated w/spring

ㆍType ADL double lip rubber coated w/spring

ㆍType AO single lip rubber coated - no spring

ㆍType AODL double lip

ㆍType B single metal lip-metal case w/spring

ㆍType BDL double lip

ㆍType BO single lip - metal case

ㆍType BODL double lip metal case

ㆍType C single lip full metal case w/spring


Choosing the right seal is important as it determines the sealing performance by effectively preventing the leakage of lubricating oils and the ingress of contaminants.


Materials of Choice


Oil seals are made from several materials. However, the material must be chosen considering several parameters including operating temperature, environment, pressure, and maximum shaft surface speed, among others. The most commonly used materials for oil seal construction are as follow:


ㆍPolyTetraFluoroEthylene (PTFE)

ㆍFluoroelastomer ( Viton )


ㆍPoly Acetal


ㆍGeneral Purpose Polyurethane

ㆍNitrile Buna Rubber




Auto oil seal



ㆍThermoplastic Elastomer

ㆍPTFE Filled Polyamid

ㆍHot Water Resistant Polyurethane

ㆍHodrogenated Nitrile

ㆍEthylene Propylene






ㆍUltra High Molecular Weight Polyethylene


Applications of Oil Seals


Oils seals find immense applications in agriculture, automotive, construction, material handling, mining, oil and gas, and so on. They are used in the assembly of:





ㆍGrinding Mills


ㆍWind Turbines


So far, we have discussed features, types, materials used in the construction, and applications of oil seals. We are an auto oil seal supplier. If you are interested in our products, please contact us now!

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