TC Oil Seal NBR Double Lip — Metric Rotary Shaft Seal ID 65–400mm

Measure your shaft outer diameter with calipers — that value is the seal's Inner Diameter (ID). Measure the housing bore inner diameter for the Outer Diameter (OD), then measure the available axial depth for the Height. Example: a 100mm shaft in a 125mm bore with 12mm depth needs a 100 × 125 × 12 seal (100mm ID ≈ 3.94", 125mm OD ≈ 4.92", 12mm height ≈ 15/32"). All three dimensions must match — ordering by ID alone is not sufficient.

The TC (double lip) type adds a secondary dust exclusion lip behind the primary sealing lip. The primary lip retains lubricant inside the bearing cavity; the secondary lip generally blocks dirt, water, and debris from entering. Single-lip (SC) seals omit the dust lip and are typically used in cleaner, enclosed environments. TC seals are generally preferred for agricultural, construction, and outdoor industrial equipment where contamination ingress is a concern.

NBR is generally resistant to water, petroleum oils, and mild chemicals, making it suitable for outdoor and wet environments in most cases. However, NBR is not recommended for prolonged exposure to ozone, strong UV, aromatic solvents, or phosphate-ester hydraulic fluids. For extreme chemical or UV-exposed environments, contact us to confirm suitability before ordering.

TC skeleton oil seals are designed for rotary shaft applications at low to moderate speeds. NBR lip seals typically perform well at shaft surface speeds up to approximately 4–8 m/s under light radial load. For high-speed spindle, pump, or turbine applications, contact us to confirm the specific size rating before ordering.

Yes. All sizes follow standard metric dimensions (ID × OD × Height in mm), compatible with ISO and DIN metric shafts and housings. They are not designed for inch-standard (SAE) shafts. To convert: a 3" shaft = 76.2mm, so the closest metric ID is typically 75mm or 80mm. Always verify the converted dimension matches an available variant before ordering.

NBR is compatible with most petroleum-based oils and greases, hydraulic fluids, and water-based fluids. It is generally not compatible with aromatic hydrocarbons, ketones, esters, or phosphate-ester hydraulic fluids. If you are using a synthetic or specialty fluid, contact us to confirm compatibility before ordering.

Clean the housing bore and shaft thoroughly. Lightly lubricate the seal lip with the same oil or grease used in the application. Press the seal squarely into the bore using a flat press tool or seal driver — never hammer directly on the seal face. Ensure the seal sits flush or slightly below the housing face. Avoid nicking the lip on shaft keyways or threads during installation, as lip damage will cause immediate leakage.

ID = Inner Diameter — fits over the rotating shaft. OD = Outer Diameter — presses into the stationary housing bore. Height = axial thickness of the seal. All values are in millimeters. Example: 80 × 100 × 10 means 80mm ID (≈3.15"), 100mm OD (≈3.94"), 10mm height (≈3/8"). Select the variant that matches all three measurements from your application.