The numbers on an oil seal, also known as a shaft seal or rotary seal, provide important information about its dimensions, material, and design specifications. Understanding these numbers is crucial when selecting the right oil seal for a specific application. Here's a breakdown of the typical numbering system used for oil seals:
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The first set of numbers usually represents the shaft diameter or the inner diameter (ID) of the oil seal. This measurement is critical because it indicates the size of the shaft around which the oil seal will be installed. For example, if the number is 25, it signifies that the oil seal is designed for a shaft with a 25-millimeter diameter.
The second set of numbers corresponds to the housing bore diameter or the outer diameter (OD) of the oil seal. This measurement is crucial as it indicates the size of the bore or cavity in the housing where the oil seal will be placed. For example, if the number is 40, it means the oil seal is designed to fit into a bore with a 40-millimeter diameter.
Rubber Skeleton Oil Seal
The third set of numbers or letter represents the width of the oil seal. It specifies the radial dimension of the seal, indicating how thick or wide the oil seal is. For example, if the number is 7, it means the oil seal has a width of 7 millimeters.
Some oil seals may have additional letters or codes indicating the lip type or special design features. These codes specify the sealing lip material, configuration, or any special features that the oil seal may have. Common lip types include single lip (S), double lip (D), and triple lip (T).
In certain numbering systems, a letter or code may be used to indicate the material composition of the oil seal. Different materials may be chosen based on factors like temperature resistance, chemical compatibility, and application requirements.
For example, if you have an oil seal with the number "25-40-7," it can be interpreted as follows:
Inner Diameter (ID): 25 millimeters
Outer Diameter (OD): 40 millimeters
Width: 7 millimeters
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Understanding these numbers is crucial when replacing or specifying oil seals for machinery or equipment. It ensures compatibility with the shaft and housing dimensions and helps maintain effective sealing performance. When in doubt, it's recommended to refer to the manufacturer's documentation or consult with a supplier to ensure the correct oil seal is selected for the intended application.
In auto oil seal applications, lip seals secure the application from high pressures as they provide a tighter sealing action, automotive oil lip seals are available in a variety of configurations to support a wide range of industries and their different requirements . There are several types of oil lip seals. They are available in a variety of materials and sizes. They can be made with or without springs. The most commonly used oil lip seals include: External oil seal, Single oil seal, Dual oil seal, Flange Case oil seal, PTTE oil seal and more.If you have questions about car sealing, please contact us.
The oil seal is generally composed of three basic components: sealing element, metal shell and clamping spring.Types of oil seals include single and double lips, rubber or polymer, metal housing, spring loaded, and internal, external and axial guides.
The purpose of the sealing element is to stop the leakage of fluid between the shaft and the housing. The metal housing will give rigidity and strength to the sealing element when it is held in a bore or recess. The spring will help make the sealing element more effective. All materials must be selected according to the environment in which the oil seal will be placed.
1. Isolation of dust and prevention of leakage of hydraulic oil and gas.
2. Reciprocating operation to exclude contamination.
3. Double steel shell design, enhanced structure, enhanced ability to exclude dust, dirt and sludge.
4.Screw design to reduce friction, seal, exclude dust and protect axle and bearing from dust, grit, mud and other contamination.
Industrial machinery, industrial motors, vehicle starter motors, gearboxes, multi-purpose seals, tarsal joint absorbers, hydraulic cylinders, cylinders, air pressure bars, shafts on vehicles, drive shafts, agricultural spare parts, engine crankshafts, camshafts, starters, trailers, heavy trucks, agricultural machinery, hubs of heavy machinery.
Available for Most Car Brands
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IVEVO / VOLVO / SCANIA
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We are NNK brand under NOK-CN, accept ODM and OEM. We have the ability to provide samples of disassembled products, develop molds, and carry out production. If you have any car oil seal problems, you are very welcome to leave us a message, we will arrange professional staff to communicate with you! NNK, a leading manufacturer with over 42 years of expertise, specializes in producing OE-quality seals for automotive and industrial applications. Known for high durability, NNK guarantees its oil seals to last up to 800,000 km and valve stem seals up to 120,000 km, with 100% Taiwan-quality assurance. Serving a global market, we supply large quantities of rubber parts and stamping parts for automotive maintenance plants, oil seal suppliers, and importers worldwide. Our factory, with 120 employees, offers fast, large-scale production and customization services, including mold development. NNK's product range includes auto oil seals, valve stem seals, O-rings, truck oil seals, and more—all produced with strict in-house quality control. With decades of experience and technical leadership, NNK is committed to providing reliable sealing solutions and exceptional service to every customer.
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