Measure three dimensions on your application: the shaft outer diameter (this becomes the seal ID), the housing bore inner diameter (this becomes the seal OD), and the housing depth (this becomes the seal width). The size format on this listing is ID × OD × Width in millimeters.

To convert from inches: multiply by 25.4. For example, a shaft of 1.181" × bore of 2.047" × depth of 0.394" equals approximately 30 × 52 × 10mm. Always verify all three dimensions before ordering.

TC designates a double-lip radial shaft seal. The primary lip faces inward to retain oil or grease inside the housing. The secondary lip faces outward to act as a dust excluder, blocking dirt, water, and debris from entering. This two-barrier arrangement generally outperforms single-lip seals in environments with external contamination.

TC-type radial shaft seals are designed for low-pressure dynamic sealing on rotating shafts — typically up to approximately 0.3 bar (4.4 psi) of continuous internal pressure. They are not suitable for high-pressure hydraulic lines. If your application involves elevated internal pressure, contact us to confirm suitability before ordering.

NBR nitrile rubber is generally resistant to petroleum-based oils, water splash, and mild weather exposure, making these seals suitable for outdoor equipment such as lawn tractors, ATVs, agricultural machinery, and marine outboard lower units. For prolonged saltwater immersion or sustained high-temperature environments above 120°C (248°F), a Viton (FKM) lip seal may be more appropriate.

These seals conform to DIN 3760 / ISO 6194 metric dimensional standards. They fit any smooth, round shaft with the matching ID and a housing bore matching the OD. Compatibility is based on physical dimensions — shaft diameter and bore size — not thread pitch or thread standard. The shaft surface finish should typically be Ra 0.2–0.8 µm for optimal sealing.

Oil seals are wear items that require periodic replacement as part of routine maintenance. Purchasing a pack of 20 provides workshop stock for scheduled service intervals, fleet maintenance, or full equipment rebuilds — reducing per-unit cost and eliminating delays from reordering. Shops servicing multiple machines of the same model will typically use the same seal size across units.

Maximum allowable shaft surface speed depends on the specific size, lubricant viscosity, and operating temperature. TC-type NBR seals are generally suitable for shaft surface speeds up to approximately 4–8 m/s under normal lubricated conditions. For high-speed spindle or pump applications, contact us with your RPM and shaft diameter so we can confirm suitability.