To select the correct TBT OIL SEAL, match the seal’s inner diameter to the shaft diameter, outer diameter to the housing bore, and width to the available installation space. A size is normally written as ID × OD × Width in millimeters, such as 35 × 52 × 7 mm. I recommend confirming the actual shaft, housing, operating medium, temperature, speed, and installation conditions before placing a production order because a dimensionally correct seal can still be unsuitable for the application.
I prepared this guide for maintenance engineers, procurement teams, OEM designers, distributors, and industrial buyers sourcing TBT OIL SEAL products. It is useful when replacing an existing seal, converting an imperial size to a metric equivalent, or specifying a seal for a new machine. It can also help buyers prepare a more complete inquiry for TEBIETE.
Because product availability, profile design, and material combinations may vary by application, I use standard oil seal selection principles rather than presenting unverified availability as a fixed TBT catalog. For a final quotation, I suggest sending the measured dimensions and operating conditions to our team for confirmation.
The first number is the nominal shaft diameter, also called the seal inner diameter or ID. The second number is the housing bore diameter, represented by the outer diameter or OD. The third number is the overall seal width, which must fit the axial space in the housing.
| Dimension | What It Controls | How I Use It |
|---|---|---|
| ID | Contact with the rotating or stationary shaft | Measure the shaft diameter in the seal contact area |
| OD | Fit inside the housing bore | Measure the clean, undamaged bore |
| Width | Axial installation space | Check the housing depth and any retaining shoulder |
For example, a seal marked 40 × 62 × 8 mm is intended for a nominal 40 mm shaft, a nominal 62 mm housing bore, and an 8 mm installation width. I do not recommend choosing a seal by OD alone or assuming that a similar-looking part will provide the same fit. The shaft surface, bore condition, seal lip design, and material must also be compatible.
The following chart shows common metric reference formats that buyers may encounter when searching for TBT OIL SEAL replacements. These are dimensional examples for inquiry preparation, not a guarantee that every size is stocked or available in every profile. Please ask TEBIETE to verify the exact size, profile, material, spring configuration, and packaging before purchase.
| Reference Size ID × OD × Width | Typical Inquiry Use | Verification Required |
|---|---|---|
| 20 × 35 × 7 mm | Compact shafts and light-duty housings | Profile, lip design, medium, and speed |
| 25 × 40 × 7 mm | Small gearboxes, pumps, and rotating assemblies | Shaft finish, pressure, and temperature |
| 35 × 52 × 7 mm | General industrial replacement applications | Housing depth and available elastomer |
| 40 × 62 × 8 mm | Medium-size shafts and equipment housings | Rotation speed, lubricant, and installation method |
| 50 × 72 × 10 mm | Larger shafts in drives and machinery | Pressure, shaft runout, and contamination protection |
NBR is commonly considered for mineral oils, greases, and general industrial service, especially where cost efficiency and broad availability are important. FKM is often evaluated when higher temperature resistance or improved compatibility with demanding fluids is required. ACM may be considered for certain automotive and oil-resistant applications, while PTFE-based designs may be selected when low friction, chemical resistance, or special temperature requirements are priorities.
These are general material-selection directions, not a substitute for a compatibility review. Actual performance depends on the compound, fluid formulation, temperature cycle, pressure, shaft speed, and seal geometry. I recommend identifying the exact lubricant or medium rather than describing it only as “oil.”
A basic radial shaft seal may be suitable for clean, lubricated equipment with limited external contamination. A seal with a dust lip can provide additional protection where dirt, moisture, or particles may reach the shaft area. Depending on the equipment design, buyers may also need a metal-cased, rubber-covered, pressure-capable, or high-temperature profile.
Pressure is an important decision point. Many standard oil seals are intended mainly for retaining lubricants and are not automatically suitable for significant hydraulic pressure. If the application includes pressure, frequent pressure cycling, or high shaft runout, I advise requesting a pressure-rated design review instead of replacing the seal with a standard profile.
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Size is the first filter, but it is not the complete specification. A 35 × 52 × 7 mm seal with one elastomer may behave differently from another seal with the same dimensions but a different lip profile or spring material. Buyers should therefore include the full size, profile code if known, material requirement, and application information in the purchase request.
Operating speed and shaft condition deserve special attention. A rotating shaft with visible wear, excessive runout, or poor surface condition can cause leakage even when the seal dimensions are correct. In my experience as a supplier, resolving the shaft and housing condition early is often more effective than simply changing to a more expensive seal material.
I also caution against selecting a replacement solely by a competitor’s part number. Cross-references can be helpful for initial research, but they should be confirmed by actual dimensions and service conditions. A cross-reference may match the nominal size while differing in material, dust lip, pressure capability, or casing design.
For standard sizes, pricing is usually influenced by material, profile, order quantity, packaging, and production availability. Custom dimensions, special compounds, non-standard spring materials, and customized markings may require additional engineering review or tooling discussion. I recommend separating the request into three categories: sample quantity, trial order quantity, and forecast annual demand.
Lead time should be confirmed for each specific TBT OIL SEAL specification rather than estimated from size alone. A common dimension may still require production if the requested material or profile is specialized. When I prepare a quotation through TEBIETE, I can review the requested dimensions, application, packaging, and shipping requirements together so the commercial offer reflects the actual product configuration.
At TEBIETE, I help buyers organize incomplete seal information into a practical specification. You can provide a drawing, photograph, old seal marking, sample, or the three basic dimensions, and I can identify the additional information needed for evaluation. This is particularly useful when the original seal has no readable brand or when the equipment supplier’s part number is unavailable.
Our support can include dimensional confirmation, material discussion, profile comparison, sample coordination, bulk quotation preparation, packaging requirements, and export order communication. I do not recommend a seal without reviewing the application limits, so the more information you provide, the more accurately I can assess the proposed TBT OIL SEAL.
The correct TBT OIL SEAL size is identified by matching ID, OD, and width, but reliable selection also requires material and operating-condition checks. Start with the shaft and housing measurements, use the reference chart only as an inquiry aid, and verify the exact profile before ordering. For critical equipment, review pressure, speed, temperature, fluid compatibility, shaft condition, and contamination together.
Your next step is to send TEBIETE the required size in ID × OD × Width format, the original seal marking or drawing, and the application details. I can then help confirm the suitable TBT OIL SEAL configuration, clarify sample or MOQ requirements, and prepare a quotation for your project.
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