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Shanfengyoufeng
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Nov 20,
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Oil seals are critical components in many mechanical systems. They prevent the leakage of lubricants from gaps within machines and bearings. Two common types of oil seals are SC and TC seals. This article will explore the differences between these two types of seals.
SC Oil Seals
SC oil seals also known as Single Lip Oil Seals, are typically used in applications where there is no pressure or very low pressure. They have a single lip that seals radially and axially against the shaft. The lip is usually manufactured from an elastomer material, which provides excellent sealing properties. SC oil seals are commonly used in electric motors, gearboxes, and pumps.
TC Oil Seals
TC oil seals also known as Double Lip Oil Seals, have two sealing lips. The primary lip prevents the leakage of lubricants, while the secondary lip keeps dirt and other contaminants out of the system. This makes TC oil seals ideal for applications where contamination is a concern. They are often used in automotive applications, such as wheel bearings and transmissions.
Key Differences
The key difference between SC and TC oil seals lies in their structure and application. SC oil seals have a single lip and are used in low-pressure applications. On the other hand, TC oil seals have a double lip and are used in applications where contamination prevention is crucial.
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Both SC and TC oil seals play vital roles in various applications. Understanding their differences can help you choose the right seal for your specific needs.
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:
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
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.
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