Metric Oil Shaft Seal 410mm - 910mm Dust Grease Seal TC Double Lip w Spring

Measure three dimensions on your existing seal or housing: the inner diameter (ID) — the shaft diameter the seal lip contacts; the outer diameter (OD) — the housing bore the seal presses into; and the depth (width) of the seal groove. Match all three to the variant listed as "Inner Ø x Outer Ø x Depth" in the dropdown above. If your shaft is worn, measure the housing bore and depth first, then confirm the shaft diameter falls within the seal's rated range.

"TC" designates a double-lip seal with a garter spring. The first (primary) lip retains oil or grease inside the housing. The second (secondary) lip faces outward and acts as a dust and dirt excluder. The garter spring keeps the primary lip in constant contact with the shaft even as the rubber wears slightly over time. This two-barrier design makes TC seals the standard choice for most rotating shaft applications where both lubrication retention and contamination exclusion are required.

These seals use nitrile rubber (NBR), which performs well with conventional petroleum-based oils and greases. NBR has limited compatibility with some synthetic fluids, particularly polyglycol-based (PAG) oils and certain ester-based synthetics. If your application uses synthetic lubricants, verify NBR compatibility with your fluid supplier before installation. For synthetic-fluid environments, a fluoroelastomer (FKM/Viton) seal may be more appropriate.

Clean the housing bore and shaft thoroughly before installation. Apply a thin film of clean grease to the seal lip and the shaft surface. Use a seal driver or a flat pressing plate that contacts only the outer steel shell — never press on the rubber lip. Press the seal in squarely until it is flush with or slightly below the housing face. Avoid driving the seal in at an angle, as this can distort the shell and cause leakage. For very large seals (600 mm+), a hydraulic press with a correctly sized adapter plate is recommended.

Common causes of early seal failure include: incorrect size selection (ID, OD, or depth mismatch); excessive shaft runout or surface roughness (shaft finish should typically be 0.2–0.8 µm Ra); installation damage to the lip from improper tooling; operating temperatures or fluid types outside the NBR rating; and shaft speeds exceeding the seal's rated peripheral velocity. Ensuring the shaft surface is smooth, the seal is correctly sized, and installation is performed with proper tooling will significantly extend service life.

TC oil seals are designed primarily for dynamic applications where the shaft rotates relative to the seal. The garter spring and lip geometry are optimized for rotary shaft sealing. They are not intended for reciprocating (linear) motion or purely static face-sealing applications. For static sealing, an O-ring or gasket is typically the correct choice.

Signs that a TC oil seal requires replacement include: visible oil or grease leakage around the shaft; a hardened, cracked, or deformed rubber lip on the removed seal; scoring or grooving on the shaft surface at the seal contact area; and contamination (dirt or water) found in the lubricant. Routine replacement at major service intervals — even before visible failure — is recommended for critical equipment to prevent unplanned downtime.