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The SB oil seal is a single-lip rotary shaft seal with a fully steel outer case. It is designed for applications where a rigid metal-to-metal press fit is needed in the housing, such as gearboxes, pumps, electric motors, drives and agricultural machinery.
The spring-loaded sealing lip keeps steady contact with the rotating shaft, helping retain oil or grease and reduce the risk of external contamination. SB oil seals are available in materials such as NBR, FKM/FPM, ACM, EPDM and VMQ.
The SB profile is also known by references such as WB, OS-B10, TR-C, CRW1, B, M, L1, B1, ABI, 822 N, DF, BB, 48, EE, R4, RM and KB.
An SB oil seal is a rotary shaft seal with a single lip and a fully steel outer case. The single sealing lip runs against the shaft and helps keep lubricant inside the application. The steel outer case gives the seal a firm metal-to-metal fit in the housing.
This construction makes the SB oil seal different from oil seals with a rubber-covered outside diameter. A rubber-covered oil seal can be useful in certain housing conditions, but an SB oil seal is selected when the application requires a rigid metal OD and a stable fit in the bore.
SB oil seals are often used by buyers, engineers and maintenance teams who need a replacement seal based on an existing reference, drawing, machine specification or measured shaft and housing dimensions.
The SB rotary shaft seal is built around three important elements: the steel outer case, the sealing lip and the spring. Together, these parts help the seal sit firmly in the housing and maintain contact with the rotating shaft.
| Part | Function |
|---|---|
| Steel outer case | Provides a rigid outside diameter and helps the seal lock tightly into the housing. |
| Single sealing lip | Runs against the shaft to help retain lubricant and reduce contamination. |
| Metal spring | Keeps pressure on the sealing lip for consistent shaft contact. |
This design makes the SB oil seal a practical choice for applications where a stable metal OD fit is required. The exact performance depends on the shaft condition, housing tolerance, speed, temperature, medium and material selection.
Choose an SB oil seal when the original seal specification, housing design or machine drawing calls for a single lip rotary shaft seal with a fully steel outer case. The metal OD can be useful when the housing is suitable for a rigid seal outside diameter and when a stable fit is required.
The SB oil seal is commonly selected for low-pressure sealing applications up to 0.05 MPa. It can be used in industrial environments where vibration, fluctuating loads and temperature changes are present, provided the dimensions and material are suitable for the application.
Before selecting an SB rotary shaft seal, check:
The rotary shaft seal SB is available in several materials, including ACM, EPDM, FPM (Viton), NBR and VMQ. The right material depends on the medium, temperature, shaft speed and operating conditions.
| Material | Typical reason to choose it |
|---|---|
| NBR | Commonly used for standard oil and grease sealing applications. |
| FPM (Viton) | Often selected for higher temperatures or more demanding chemical conditions. |
| ACM | Used when the application requires material properties that match ACM. |
| EPDM | Selected when the medium and temperature conditions are suitable for EPDM. |
| VMQ | Used when the application requires a silicone-based sealing material. |
Material choice is important because the wrong elastomer can reduce service life or cause the seal to fail earlier than expected. If you are replacing an existing SB oil seal, use the original material specification where possible. If that information is missing, compare the medium, temperature and operating conditions before selecting a material.
SB oil seals are used in rotary shaft applications where lubricant retention, stable housing fit and reliable shaft contact are important. Because of the fully steel outer case, the SB type is often selected for machinery where a rigid OD fit is preferred over a rubber-covered outside diameter.
Typical applications include:
In these applications, the SB oil seal helps retain lubricant around the shaft while limiting external contamination. Always check whether the SB profile, dimensions and material match the original specification before installing a replacement seal.
Oil-Seal-Stocks offers SB oil seals in a range of shaft, bore and width dimensions. Use the product filters to find the correct SB oil seal size, material and execution.
If the required size is not listed, contact us to check availability or a suitable alternative rotary shaft seal. You can also send the existing reference, such as WB, OS-B10, TR-C, CRW1, R4 or RM, together with the dimensions. This makes it easier to identify the correct replacement.
SB, SA, TB and DB oil seals are related rotary shaft seal types, but they are not automatically interchangeable. Each profile has its own construction, fit and application logic. Choose SB when the application calls for a single lip oil seal with a fully steel outer case.
| Oil seal type | Choose this type when... |
|---|---|
| SB oil seal | You need a single lip rotary shaft seal with a fully steel outer case. |
| SA oil seal | You need the specific SA profile or execution. |
| TB oil seal | You need a TB-profile oil seal or a related alternative. |
| DB oil seal | You need the specific DB profile or execution. |
The safest way to select an SB oil seal is to combine the reference with the measured dimensions and operating conditions. A reference can point you in the right direction, but it does not replace a full technical check.
If you are unsure, contact Oil-Seal-Stocks with the reference code, dimensions and application details. We can help you check whether the SB oil seal is the right profile or whether another rotary shaft seal is more suitable.
An SB oil seal is a rotary shaft seal with a single sealing lip and a fully steel outer case. It is used to seal around rotating shafts, retain lubricant and limit contamination from outside the application.
The SB oil seal is also known by references such as WB, OS-B10, TR-C, CRW1, B, M, L1, B1, ABI, 822 N, DF, BB, 48, EE, R4, RM and KB. Always compare the reference with the required dimensions, material and operating conditions before selecting a replacement.
The SB oil seal has a fully steel outer case instead of a rubber-covered outside diameter. This gives the seal a rigid metal OD that fits tightly into the housing.
The SB oil seal is a low-pressure rotary shaft seal and can be used up to 0.05 MPa. Always check whether the pressure, speed, temperature and material match the application.
