TC Oil Seal Metric NBR Double Lip Rotary Shaft Seal — ID 8mm to 32mm, 5-Pack

Match the seal's Inner Diameter (ID) to your shaft diameter, the Outer Diameter (OD) to your housing bore, and the Height to the depth of your seal groove. For example, a 20mm shaft in a 35mm bore with a 7mm groove depth requires a 20 × 35 × 7mm seal — that's approximately 25/32" × 1-3/8" × 9/32" in inch terms. Always measure in millimeters and verify all three dimensions before ordering.

TC stands for Twin Contact (also called Double Lip). A TC oil seal has two sealing lips: the primary lip retains lubricant on the inside, while the secondary dust lip faces outward to block contaminants. This dual-lip design generally provides better protection than single-lip (SC) seals in environments with dust, dirt, or moisture.

NBR (Nitrile Butadiene Rubber) is the most widely used elastomer for oil seals. It offers good resistance to petroleum-based oils, gear oils, greases, and mineral hydraulic fluids, and typically performs well from approximately –40°F to +250°F (–40°C to +120°C). It is not recommended for brake fluid, phosphate ester hydraulic fluids, ketones, or strong acids. For those applications, a Viton (FKM) seal is generally more appropriate.

NBR TC seals are generally suitable for outdoor use where exposure involves oil, grease, and water splash. The secondary dust lip helps exclude moisture and debris. However, for prolonged submersion or environments with significant ozone or UV exposure, a Viton seal is typically a better choice. Contact us to confirm suitability for your specific application.

TC oil seals are designed for rotary shaft applications at low-to-moderate speeds — typically up to 4–6 m/s shaft surface speed — and low differential pressures, generally under 0.3 bar (≈4.4 psi). For high-speed spindles, turbocharger shafts, or pressurized housings, please contact us to confirm compatibility before ordering.

Yes. All dimensions — ID, OD, and Height — are in millimeters and follow metric standards as used in European and Asian automotive, agricultural, and industrial machinery. If your equipment uses inch-based dimensions, convert carefully: for example, a 25mm ID ≈ 0.984" (close to 1"), a 47mm OD ≈ 1.850", and a 7mm height ≈ 0.276". Always verify the exact mm measurement rather than relying on rounded inch equivalents.

Clean the housing bore and shaft thoroughly. Lightly lubricate the seal lips with the fluid being sealed (e.g., gear oil). Press the seal squarely into the housing bore using a seal driver or a flat wooden block — never hammer directly on the seal face or lip. Ensure the primary lip faces the lubricant side (inward). Avoid nicking or rolling the lips during installation, as this is the most common cause of premature seal failure.