TC Double Lip NBR Rotary Shaft Oil Seal — 80mm to 135mm ID

Measure three dimensions: the shaft diameter (= Inner Diameter / ID), the housing bore diameter (= Outer Diameter / OD), and the housing depth (= Width). The size format used here is ID × OD × Width in mm. For example, 80 × 100 × 10mm means an 80mm shaft, 100mm bore, and 10mm wide seal. If you're working in inches, convert first — a 3.5" shaft is approximately 88.9mm, so you'd select the 90mm ID option. Always measure the worn seal or housing directly rather than relying on part numbers alone.

TC stands for a double-lip seal design. It features a primary sealing lip that contacts the rotating shaft to retain lubricant, and a secondary dust lip that faces outward to block contaminants like dirt and water. This dual-lip configuration is generally more effective than single-lip (SC) seals in environments where both fluid retention and contamination exclusion are needed — such as agricultural equipment, gearboxes, and wheel hubs.

NBR (Nitrile Butadiene Rubber) is the most widely used elastomer for rotary shaft oil seals. It typically handles temperatures from approximately -40°F to +250°F (-40°C to +120°C) and offers strong resistance to petroleum-based oils, gear oils, greases, hydraulic fluids, and fuels. It is not recommended for use with brake fluid, phosphate ester hydraulic fluids, or environments with high ozone or UV exposure — for those applications, a Viton (FKM) seal is generally a better choice.

NBR oil seals generally perform well in wet and humid conditions. The secondary dust lip on TC-type seals helps exclude water and debris from the housing. However, for prolonged submersion or saltwater exposure, a Viton (FKM) seal is typically more suitable. If you're unsure whether NBR is right for your environment, contact us to confirm before ordering.

TC-type rotary shaft oil seals are designed for dynamic sealing on rotating shafts. They are generally suitable for shaft surface speeds up to approximately 4–6 m/s and low-to-moderate pressure differentials. For high-speed spindles, turbocharger shafts, or pressurized housings, please contact us to confirm compatibility before ordering.

Yes. All dimensions listed are metric (mm) and follow standard metric sizing conventions used in automotive, agricultural, and industrial equipment worldwide. If your equipment uses inch-based dimensions, convert to mm before selecting — for example, a 3-inch shaft is approximately 76.2mm (closest available ID would be 80mm; verify OD and width also match). Contact us if you need help cross-referencing inch sizes.

Clean the housing bore and shaft thoroughly before installation. Lightly lubricate the seal lip with the fluid it will be sealing. Press the seal squarely into the bore using a seal driver or a flat block — never hammer directly on the seal face, as this can distort the case or damage the lip. The primary lip should face toward the fluid being retained (inward). Protect the lip from sharp edges like keyways or splines during installation by wrapping the shaft end with tape or using an installation sleeve.

FB and TG4 are manufacturer or catalog reference codes that typically indicate the seal's construction style, spring configuration, or material grade variant. In practice, these codes are used to cross-reference equivalent seals across different brands and catalogs. The functional specification — TC type, NBR material, and the listed ID × OD × Width dimensions — is what determines fit and performance. Contact us to confirm cross-reference compatibility for your specific application.