Measure three dimensions: ID (inner diameter — fits the shaft), OD (outer diameter — fits the housing bore), and height (axial thickness). All seals in this listing are 14mm thick. Match your shaft diameter to the ID and your housing bore to the OD. For example, a 120mm shaft in a 150mm bore housing needs the 120×150×14mm size. When in doubt, measure your old seal with calipers rather than relying on part numbers alone.

TC designates a double-lip seal: a primary sealing lip (spring-loaded in TG4 type) that retains oil or grease, and a secondary dust lip that prevents contaminants from entering the bearing or gearbox. This dual-lip configuration is generally more effective than single-lip (SC) seals in environments with both lubrication retention and contamination exclusion requirements — such as agricultural equipment, construction machinery, and industrial gearboxes.

NBR (nitrile butadiene rubber) is generally compatible with petroleum-based oils, hydraulic fluids, greases, diesel fuel, and water. It typically performs in a temperature range of approximately −40°C to +120°C (−40°F to +248°F). NBR is not recommended for use with ketones, esters, or aromatic hydrocarbons. For high-temperature or chemically aggressive environments, FKM (Viton) seals are generally a better choice.

Yes. The TC double-lip design includes a secondary dust and water exclusion lip, making these seals suitable for outdoor equipment, agricultural machinery, and applications where moisture and debris are present. The metal outer case (FB type) provides a secure press-fit and resists distortion. For fully submerged or saltwater applications, contact us to confirm suitability for your specific use case.

NBR TC oil seals are generally rated for low-to-moderate shaft speeds, typically up to around 4–8 m/s peripheral velocity depending on shaft diameter and surface finish. They are designed for low-pressure applications, generally up to 0.05 MPa (approximately 7 psi). For high-speed spindle applications or elevated pressure environments, contact us to confirm suitability before ordering.

For reliable sealing, the shaft surface in the seal contact zone should generally have a surface roughness of Ra 0.2–0.8 µm (approximately 8–32 µin). A hardened shaft surface (typically 45–60 HRC) is recommended to minimize lip wear over time. Avoid spiral machining marks on the shaft, as these can act as a pump and draw fluid past the seal lip.

Press the seal squarely into the housing bore using a seal driver or flat plate — never hammer directly on the seal face or lip. Apply a thin film of clean oil or grease to the seal lip before installation to prevent dry-start damage. Ensure the primary lip faces toward the oil side (inward). Do not press the seal deeper than the housing bore depth, as over-pressing can distort the metal case and compromise the seal.

These seals use metric dimensions (mm). They are compatible with metric shafts and housings. For imperial (inch) shaft applications, verify that the metric ID converts closely to your shaft size — for example, 120mm ≈ 4.72", 130mm ≈ 5.12", 140mm ≈ 5.51". Contact us to confirm fit if you are working with inch-dimensioned equipment where a close metric equivalent may not provide the correct interference fit.