NBR Rotary Shaft Oil Seal TC Type | Nitrile Lip Seal 42–400mm Shaft | Many Sizes

Match the three dimensions shown in the variant selector: Inner Diameter (ID) = your shaft diameter, Outer Diameter (OD) = your housing bore, Height = your housing groove depth. For example, a 42 × 62 × 8mm seal fits a 42mm (≈1.65") shaft in a 62mm (≈2.44") bore with an 8mm (≈0.31") groove. Always measure your existing seal or housing before ordering — do not rely on part numbers alone.

TC seals generally feature a double-lip design: a primary sealing lip backed by a garter spring, plus a secondary dust exclusion lip on the atmosphere side. TG4 and FB designations typically refer to single-lip or alternative lip-geometry variants used in specific industrial or agricultural applications. All types in this listing use NBR compound and are functionally interchangeable in most general-purpose shaft sealing applications. If your application requires a specific profile, contact us to confirm.

NBR TC-type rotary shaft seals are generally rated for low-pressure applications — typically up to 0.3 bar (4.4 psi) dynamic pressure. Shaft surface speeds are typically up to 4–6 m/s (800–1,200 ft/min) depending on shaft finish, lubrication, and temperature. For high-speed spindle applications or elevated pressures, please contact us to confirm suitability before ordering.

NBR nitrile rubber offers good resistance to petroleum-based oils, greases, water, and mild chemicals, making it generally suitable for outdoor use in moderate climates. However, NBR is not recommended for prolonged exposure to ozone, strong UV radiation, or ketone/ester-based fluids. For harsh outdoor, chemical, or high-temperature environments, a Viton (FKM) seal may be more appropriate — contact us for guidance.

NBR seals are generally compatible with mineral-based engine oils, gear oils, hydraulic fluids, and ATF (automatic transmission fluid). Compatibility with fully synthetic PAO or ester-based oils varies — in most cases NBR performs adequately for standard service intervals, but for long-term exposure to aggressive synthetics, verify compatibility or consider an FKM alternative. Contact us if you are unsure about your specific fluid.

For optimal sealing life, the shaft surface in the lip contact zone should typically be ground or polished to Ra 0.2–0.8 μm (8–32 μin). Rough, scored, or corroded shafts will accelerate lip wear and cause premature leakage. Shaft hardness of HRC 45–60 is generally recommended in the sealing zone. If your shaft is worn, a repair sleeve (speedi-sleeve) can restore the sealing surface without replacing the shaft.

Apply a thin film of clean oil or grease to the seal lip and shaft before installation. Use a seal driver or a flat press plate sized to the OD to press the seal squarely into the housing bore — never hammer directly on the seal face or lip. Press until the seal face is flush with or just below the housing surface. Protect the lip from sharp shaft edges, keyways, or splines during installation using a thin sleeve or tape over the shaft end.