TC Skeleton Oil Seal Rotary Shaft Lip Sealing Ring — Fluorine Rubber FKM

You need three measurements: inside diameter (ID) — measure the shaft diameter; outside diameter (OD) — measure the housing bore; and seal height — measure the housing groove depth. This listing covers IDs from 7mm (≈9/32") to 28mm (≈1-1/8"), ODs from 17mm (≈11/16") to 62mm (≈2-7/16"), and heights from 3mm to 10mm. Always confirm all three dimensions before ordering to ensure a proper press-fit and leak-free seal.

TC refers to a double-lip seal design with a metal skeleton frame. The primary lip (spring-loaded) retains lubricant and excludes contaminants from the fluid side, while the secondary dust lip provides an additional barrier against dirt and moisture ingress from the atmosphere side. TC seals are generally more reliable than single-lip (SC) seals in dirty, wet, or contaminated environments.

Yes. The FKM (fluorine rubber) construction typically withstands continuous operating temperatures from -20°C (-4°F) to +200°C (+392°F) and resists petroleum oils, hydraulic fluids, fuels, and many industrial chemicals. For extreme cryogenic conditions or highly aggressive chemical media, please confirm compatibility with your specific fluid before ordering.

Generally yes. FKM offers good resistance to weathering, ozone, and moisture. The TC double-lip design adds a secondary dust and water exclusion lip. These seals are commonly used in outdoor power equipment, marine shaft applications, and agricultural machinery where exposure to water, mud, and debris is expected.

For reliable sealing, the mating shaft surface should typically have a finish of Ra 0.2–0.8 µm (8–32 µin) and a hardness of at least 45 HRC to minimize lip wear. Peripheral shaft speeds are generally compatible up to approximately 4–6 m/s for standard TC lip seals, though actual limits depend on the specific size and lubrication conditions. Contact us to confirm for high-speed applications.

Apply a thin film of clean grease or the sealed fluid to the seal lip and shaft before installation. Use a flat press tool or seal driver matching the seal OD to press it squarely into the housing bore — never hammer directly on the seal face. Ensure the primary lip faces the fluid side (inward). Use a protective sleeve if the seal lip must pass over sharp keyways or threads.

Choose FKM when you need resistance to high temperatures (above 120°C / 248°F), aggressive fuels, or synthetic hydraulic fluids. NBR (nitrile rubber) is a cost-effective alternative for standard petroleum oils at lower temperature ranges (typically -40°C to +120°C). If your application involves high heat, fuel contact, or chemical exposure, FKM is generally the more durable long-term choice.