TC Oil Seal 17mm Bore Nitrile Double Lip Rotary Shaft Seal | 23–47mm OD | Multiple Sizes

Measure three dimensions: the shaft diameter (inner diameter = 17mm for this listing), the housing bore diameter (outer diameter), and the seal groove depth (height). All three must match. For example, if your housing bore is 35mm and the groove is 7mm deep, you would select the 17 × 35 × 7mm variant. If you're replacing an existing seal, the dimensions are typically stamped on the seal face or listed in your equipment's service manual.

TC-type oil seals are generally designed for low-to-medium pressure applications, typically up to around 0.05 MPa (≈7 psi) of static pressure. They are not intended for high-pressure hydraulic circuits. For higher-pressure systems, a dedicated pressure seal or labyrinth seal is generally recommended.

Yes. Nitrile (NBR) rubber offers good resistance to water, petroleum oils, and grease, making these seals well-suited for outdoor equipment, agricultural tractors, and construction machinery. However, NBR is generally not recommended for prolonged exposure to ozone, strong UV radiation, or ketone-based fluids. For those environments, a Viton (FKM) seal is typically a better choice.

These TC oil seals are dimensioned to ISO 6194 / DIN 3760 metric standards, compatible with metric shafts commonly found in European and Asian-spec equipment. For best results, the shaft surface finish should typically be Ra 0.2–0.8 μm, and shaft hardness of HRC 45–60 is generally recommended to minimize lip wear over time.

Nitrile (NBR) TC oil seals typically operate reliably from approximately -40°F to +212°F (-40°C to +100°C). Short-term temperature peaks up to +250°F (+120°C) are generally tolerable. For continuous high-temperature applications above 212°F, a silicone or Viton (FKM) seal is typically recommended instead.

A TC double-lip seal adds a secondary dust exclusion lip that faces outward, blocking contaminants like dirt, water, and debris from reaching the primary sealing lip. This makes TC seals the preferred choice for agricultural equipment, construction machinery, and any application where the shaft is exposed to a dirty or wet environment. SC single-lip seals are generally used in cleaner, enclosed environments.

Clean the housing bore and shaft thoroughly. Apply a thin film of clean oil or grease to the seal lips and the shaft surface. Press the seal squarely into the housing using a seal driver or a flat block — never hammer directly on the seal face. The seal should sit flush or slightly below the housing face. Avoid cocking or tilting during installation, as this can damage the lip and cause immediate leakage.