NBR Rotary Shaft Oil Seal TC Type Nitrile Lip Seal 110–400mm | TG4 FB Double Lip

Measure three dimensions in millimeters: shaft diameter (d), housing bore diameter (D), and seal width (B). These map directly to the variant label format d × D × B. For example, a 110 × 130 × 12mm seal fits a 110mm (≈4.33") shaft inside a 130mm (≈5.12") bore with a 12mm (≈0.47") width. If your existing seal is worn, measure the housing bore and shaft — not the old seal, which may have deformed. When in doubt, go by the housing bore (D) first, then confirm the shaft size.

TC is the most widely used designation for a double-lip metric oil seal: a primary sealing lip retains oil, and a secondary dust lip (facing outward) excludes contaminants. TG4 and FB are alternative trade designations used by different manufacturers for functionally equivalent double-lip seals. In most cases, seals with the same d × D × B dimensions are interchangeable regardless of which designation appears on the packaging.

NBR TC-type oil seals are generally rated for shaft surface speeds up to approximately 4–6 m/s. They are designed for low-pressure applications — typically under 0.05 MPa (≈7 psi) differential. For high-speed spindles, turbocharger shafts, or pressurized housings, contact us before ordering to confirm suitability.

Yes, in most outdoor and wet conditions. NBR nitrile rubber offers good resistance to water, petroleum oils, and mild weather exposure, making it a common choice for agricultural machinery, construction equipment, and outdoor power units. It is generally not recommended for continuous saltwater immersion or prolonged exposure to ozone, ketones, or aromatic solvents. For those environments, a Viton (FKM) compound seal would typically be more appropriate.

NBR is compatible with: petroleum-based engine and gear oils, hydraulic fluids (mineral-based), diesel fuel, water, and water-glycol coolant mixtures. It is not recommended for: ketones (MEK, acetone), strong acids or bases, aromatic hydrocarbons at high concentrations, or brake fluids (DOT 3/4). When in doubt about a specific fluid, request a compatibility confirmation before installation.

Follow these steps: (1) Inspect the shaft for burrs or scoring — smooth any imperfections with fine emery cloth. (2) Lightly coat the seal lip with clean oil or grease. (3) Use a seal driver or flat press tool sized to the outer diameter — never strike the seal face directly with a hammer. (4) Press in squarely until the outer face is flush with the housing. (5) Verify the lip is seated correctly and the shaft rotates freely before reassembly.

Yes — TC-type NBR shaft seals are a standard choice for industrial gearbox output shafts, centrifugal pump shafts, electric motor end shields, agricultural tractor axles, and heavy equipment final drives. Confirm the shaft diameter, housing bore, width, and operating temperature before installation. If your gearbox runs above 120°C (250°F), consider a Viton-lip variant instead.

The 1-pack is ideal for a single repair. The 2-pack gives you a spare for the next service interval. The 5-pack offers the lowest per-unit cost and is best for fleet maintenance programs, workshop stock, or servicing multiple machines with the same shaft size.