TC Oil Seal ID 80 82 85 88mm NBR Dual Lip Rotary Shaft Sealing Ring

Measure three dimensions with calipers: the shaft diameter (this becomes your ID), the housing bore diameter (this becomes your OD), and the available axial depth in the housing (this determines the thickness). The ID must match your shaft closely — typically within 0.1–0.3mm — for proper lip contact. For example, an 85mm shaft requires an 85mm ID seal; an 85×110×12mm seal fits an 85mm shaft, a 110mm bore, and a housing depth of at least 12mm (≈0.47"). If replacing an existing seal, the stamped dimensions on the old seal are the most reliable reference.

TC skeleton oil seals are generally designed for low-to-medium pressure applications, typically up to around 0.05 MPa (≈7 psi) of static pressure differential. They are not intended for high-pressure hydraulic circuits. For applications with significant pressure on the sealed side, a spring-loaded or reinforced seal design is generally more appropriate. Contact us to confirm suitability for your specific operating conditions.

NBR 70 offers good resistance to water, petroleum oils, and mild environmental exposure, making it suitable for agricultural equipment, outdoor machinery housings, and applications where occasional moisture contact occurs. However, NBR is generally not recommended for prolonged direct UV exposure or ozone-rich atmospheres. For continuous harsh outdoor use, a Viton (FKM) compound seal is typically more durable. The dual lip design does provide an added layer of dirt and moisture exclusion compared to single-lip seals.

These TC oil seals use metric dimensions and are generally interchangeable with seals conforming to ISO 6194 and DIN 3760 standards — the most common metric oil seal standards used in European and Asian equipment. They are compatible with metric shafts and machined housing bores. If your equipment uses inch-based dimensions, convert to millimeters and verify all three dimensions (ID, OD, thickness) before ordering. For example, a 3.346" shaft is approximately 85mm.

The OD must match your housing bore precisely — the seal is pressed in and relies on an interference fit for retention and leak prevention. The thickness must fit within the axial space available in your housing without protruding or bottoming out. Always measure both dimensions directly in your equipment. If you are replacing an existing seal, the part number or stamped size on the old seal is the most reliable guide. When in doubt, contact us with your equipment make and model for assistance.

A TC (double contact) seal has two sealing lips: the primary lip faces inward to retain lubricant inside the housing, and the secondary lip faces outward to exclude contaminants — dirt, dust, water — from entering along the shaft. This dual-barrier arrangement is generally preferred in agricultural, construction, and industrial applications where the shaft is exposed to environmental contamination. A single-lip seal provides only lubricant retention without the secondary exclusion function.

NBR 70 compound typically performs reliably between -40°F and +212°F (-40°C to +100°C). Short-term temperature peaks up to approximately 230°F (110°C) are generally tolerated without permanent damage. For continuous operation above this range — such as in high-temperature gearboxes or near exhaust components — a silicone (VMQ) or Viton (FKM) seal is typically the more appropriate material choice.