A TC oil seal is a radial shaft seal commonly used to retain lubricant and help keep dust or other contaminants away from a rotating shaft. It typically has a rubber-covered outer surface, a metal reinforcement ring, a spring-loaded main sealing lip, and a secondary dust lip. To select one, confirm the shaft diameter, housing bore, and seal width, then check operating conditions such as lubricant, temperature, speed, and contamination. The size examples in this guide illustrate how dimensions are written; they are not a guarantee of stock availability or suitability for a particular machine.
This guide is for equipment designers, maintenance teams, distributors, and procurement professionals who need to identify or source a TC oil seal. It is useful when replacing a seal from its dimensions, reviewing a drawing, or comparing material options for a new application. If the original part number is unavailable, measured dimensions and operating details can help narrow the specification. Final selection should still be checked against the machine and seal supplier’s recommendations.
In common seal terminology, “TC” describes a double-lip radial oil seal design. Its main lip, usually energized by a garter spring, contacts the shaft to help retain oil or grease. A secondary lip is positioned to help limit the entry of dust and other external contaminants. The exact construction can vary by manufacturer and product specification, so confirm the drawing or technical description when the distinction matters.
The seal’s outer casing is often elastomer-covered, while a metal insert supports the assembly. The rubber exterior can help provide contact with the housing bore, but it does not eliminate the need for a correctly sized and finished housing. The spring supports contact at the main lip as the shaft rotates. A TC seal is not a substitute for a bearing, a static gasket, or a seal designed specifically for every high-pressure application.
Most standard radial oil seal sizes are stated as shaft diameter × housing bore diameter × seal width. For example, 25 × 40 × 7 mm indicates a nominal shaft diameter of 25 mm, a nominal housing bore of 40 mm, and an axial width of 7 mm. The dimensions identify the basic envelope, not the material, lip arrangement, or operating limits. Always compare the size with the equipment drawing or the original seal before ordering.
Other illustrative size formats include 20 × 35 × 7 mm and 40 × 62 × 8 mm. These examples explain the notation only; they do not confirm that a particular size is available from a supplier or suitable for your machine. Metric and inch-based specifications may both appear in industrial equipment records. Avoid converting or rounding dimensions without checking the required fit and the tolerances specified for the shaft and housing.
Elastomer choice is application-dependent. Nitrile rubber (NBR) is commonly considered for general-purpose oil-sealing applications, while FKM may be considered where the fluid or temperature conditions call for a different compound. Other options, such as ACM, silicone, or PTFE-based designs, may be relevant for specific operating requirements. These names are not interchangeable performance guarantees: compatibility depends on the exact compound, fluid formulation, temperature, and seal design.
When comparing products, specify more than the basic dimensions. Ask about the lip configuration, spring material if relevant, casing style, elastomer compound, and any design details required by the equipment. Also identify the lubricant by type and, where possible, the manufacturer’s product designation. If the seal will encounter water, dust, cleaning chemicals, or intermittent dry running, state those conditions rather than assuming the standard TC design covers them.
Start with the actual shaft diameter, housing bore, and available axial space. Confirm that the shaft surface where the lip runs is suitable and has no grooves, corrosion, burrs, or damage that could affect sealing. Check whether the shaft has a lead-in feature that allows the lip to pass over edges without being cut. The housing should also be inspected for wear or distortion before fitting a replacement.
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Record the shaft speed, temperature range, lubricant, pressure exposure, and likely contamination. No single maximum speed or temperature applies to every TC oil seal because limits depend on design, material, lubrication, shaft condition, and other system factors. For that reason, do not select a seal based on a generic catalog value alone. Provide the supplier with the actual operating details and request confirmation for the proposed construction.
Consider how the machine starts, stops, and operates over time. A seal used in continuous rotation may face different conditions from one used intermittently, and the direction of rotation can matter for certain lip designs. If pressure is present, clarify its level and whether it is continuous or occasional. A standard radial oil seal may not be appropriate where pressure exceeds the design’s intended use.
This process reduces the risk of ordering a seal that matches the nominal dimensions but not the working conditions. If you only have a sample, record its markings and measure it carefully, while noting that an old seal may be compressed, worn, or deformed. A drawing or part number can help resolve uncertainty. Where information conflicts, confirm the equipment specification before placing a repeat order.
Installation practices should follow the machine and seal supplier’s instructions. Keep the lip and shaft clean, avoid damaging the spring or lip during handling, and check the required orientation before fitting. If the shaft has a keyway, spline, or sharp step, an appropriate installation sleeve or other approved protection may be needed. Do not improvise a procedure where the equipment manufacturer specifies one.
The purchase price of a TC oil seal can depend on size, material, design details, order quantity, and whether the requirement is standard or customized. Minimum order quantities and lead times also vary by supplier, specification, and stock position. These details should be confirmed in a quotation rather than assumed from a generic product description. For repeat requirements, share forecast quantities and expected order frequency so the supplier can clarify suitable sourcing arrangements.
Before ordering, check that the supplier can review a complete specification rather than only a nominal size. Ask whether the quoted product matches your drawing, material requirement, and operating conditions, and request clarification on any differences. Confirm packaging, identification, quantity, delivery terms, and documentation requirements as part of the purchase process. Where seals are safety- or uptime-critical, agree on the approval process before committing to production or a replacement batch.
TEBIETE is a manufacturer, supplier, and exporter of Tc Oil Seal products. Buyers can share dimensions, drawings, material preferences, application details, and required quantities for a product discussion and quotation. Supplying those details helps the team assess the requested specification and identify questions that may need confirmation. Availability, customization, minimum order quantity, and delivery timing should be verified for each inquiry.
Choose a TC oil seal by matching its dimensions, structure, and material to the shaft, housing, lubricant, speed, temperature, pressure, and contamination conditions. The size format—shaft diameter × housing bore × width—provides a starting point, but it is not a complete specification. Check the equipment drawing, inspect the sealing surfaces, and confirm material and design suitability before ordering. To discuss a requirement with TEBIETE, prepare the three dimensions, application conditions, drawing or sample information, and expected quantity for review.
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