To select a Tb oil seal, first confirm the shaft diameter, housing bore, and available seal width; these are commonly listed in that order as inner diameter × outer diameter × width. For example, a listing marked 25 × 47 × 7 mm would indicate a 25 mm shaft size, a 47 mm housing bore, and a 7 mm seal width, but this is an illustrative example—not a universal Tb size. The “TB” designation can refer to different profiles in different catalogs, so I recommend checking the supplier’s drawing or specification before ordering. Material, lip design, operating conditions, and installation space must also match the application.
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This guide is for maintenance teams, engineers, distributors, and purchasing professionals sourcing Tb oil seals for rotating equipment. It is useful whether you are replacing an existing seal, comparing catalog options, or specifying a seal for a new assembly. The steps below help you turn basic measurements and operating details into a clearer purchasing specification.
A seal’s nominal dimensions are only part of the decision. A seal that fits the shaft and housing can still be unsuitable if its elastomer, lip arrangement, or operating limits do not suit the fluid, temperature, speed, or exposure to dust and moisture.
Most radial shaft oil seals are described using three primary dimensions: shaft diameter, housing bore diameter, and seal width. The shaft diameter corresponds to the seal’s inner opening, while the housing bore is the outside diameter of the seal body. Width describes the axial space the seal occupies in the housing.
| Dimension | What it describes | How to verify it |
|---|---|---|
| Inner diameter (ID) | The shaft size the sealing lip fits around | Measure the shaft at the seal track, using an appropriate measuring tool |
| Outer diameter (OD) | The housing bore size where the seal is installed | Measure the bore and check the housing drawing or existing seal specification |
| Width (W) | The axial thickness of the seal | Measure the available recess and compare it with the specified seal width |
Always confirm the unit used in the drawing or catalog. A value shown in millimeters should not be assumed to match a measurement taken in inches without conversion and a tolerance check. Where fit is critical, confirm the required tolerances with the equipment drawing or seal supplier rather than relying on nominal dimensions alone.
“TB” is not a complete dimensional specification by itself. Catalogs and suppliers may use profile codes to distinguish lip arrangements, case construction, or other design details, and naming conventions can differ. I recommend asking for the profile drawing associated with the exact Tb part number, especially when a replacement must match an installed seal.
Check whether the listed dimensions describe the seal body, the shaft fit, or another catalog convention. Also confirm details such as a secondary dust lip, spring arrangement, case material, and whether the seal is intended for a particular installation direction. These details should be verified from the product specification rather than inferred from the letters in a part code.
Common oil-seal elastomers include nitrile rubber and fluoroelastomer, while other compounds may be available for specific requirements. Each material has its own compatibility and temperature limits, which depend on the compound formulation and the operating environment. Do not select a material based on a broad label alone; confirm compatibility with the fluid, temperature range, and supplier specification.
For example, a seal exposed to a particular lubricant may require a different compound from one used in a water-exposed or chemically demanding application. If the equipment sees temperature changes, intermittent operation, or fluid additives, share those conditions with the supplier. I would also identify whether the seal will encounter abrasive dust, splash, or washdown, because these conditions can affect the required lip design and protection.
Radial oil seals are used in equipment such as gearboxes, pumps, motors, agricultural machinery, and other rotating assemblies. The right choice depends on the shaft surface, direction of rotation, speed, pressure conditions, lubricant, and surrounding contamination. The equipment manufacturer’s specifications should take priority when available.
Pay particular attention to shaft condition. A worn, scored, corroded, or poorly finished seal track may cause leakage even when the replacement seal has the correct nominal dimensions. If the shaft has a wear groove, ask whether a different installation position, shaft repair, or other corrective action is appropriate before placing a repeat order.
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Start with the existing part number, equipment model, and any drawing or maintenance record. Measure the shaft diameter, housing bore, and recess width where possible, then compare your measurements with the documented nominal sizes. If you cannot remove the seal safely, use the equipment drawing or the existing component specification instead of estimating from appearance.
Record the lubricant or fluid, operating temperature range, shaft speed, pressure conditions, and exposure to dust, water, or other contaminants. Include whether the rotation is continuous or intermittent and whether the shaft reverses direction. These inputs help the supplier assess whether a standard profile and material are appropriate or whether further engineering review is needed.
Ask the supplier to confirm the exact profile code and provide a drawing or dimensional specification for review. Verify the seal’s ID, OD, width, lip arrangement, and any other features required by the equipment. If the seal is used in a critical assembly, confirm installation orientation and any specified shaft or housing tolerances before approving the part.
Before ordering, make sure the quotation or purchase specification identifies the dimensions, material, profile, quantity, and any packaging or marking requirements. Where a drawing is available, have both parties refer to the same revision. This reduces the risk of receiving a part that matches the size but differs in a functional detail.
Oil-seal pricing can depend on dimensions, material, profile, order quantity, tooling needs, and packaging requirements. A standard catalog item may have different sourcing conditions from a customized or non-standard design. Because these factors vary by specification and supplier, I recommend requesting a quotation against a complete part description rather than comparing prices from a size alone.
Minimum order quantity and lead time are also product- and order-specific. Ask whether the quoted item is a standard stocked model or requires production, and confirm the expected schedule before planning maintenance or production. If timing is important, provide the required delivery date and ask the supplier to confirm availability and shipping arrangements in writing.
A reliable sourcing conversation should establish whether the supplier understands the application as well as the dimensions. At TEBIETE, we encourage buyers to share drawings, sample details, or operating conditions so that the requested Tb oil seal can be reviewed against the intended use. A clear specification also helps us identify missing information before quotation.
For repeat purchases, retain the approved drawing, part number, material details, and order history. If the application or equipment changes, review the specification again instead of assuming the former selection remains suitable. This simple control supports more consistent procurement and makes future replacement orders easier to verify.
To select a Tb oil seal, verify the inner diameter, outer diameter, and width, then confirm the exact TB profile from the supplier’s catalog or drawing. Match the material and lip design to the fluid, temperature, speed, pressure, shaft condition, and surrounding contaminants. The example size of 25 × 47 × 7 mm is only an illustration of dimension notation, not a recommended or universal Tb specification.
Before requesting a quote, prepare the part number or drawing, measured dimensions, application details, order quantity, and target delivery date. TEBIETE can review the information and discuss the appropriate product specification, customization requirements, MOQ, and lead time for your inquiry. Contact our team with your drawing or sample details to begin a focused selection and sourcing discussion.
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