TC Oil Seal NBR Double Lip Rotary Shaft Seal — 40mm to 400mm (ID × OD × Height)

Measure three dimensions with calipers: the shaft diameter (this becomes the seal's ID), the housing bore diameter (this becomes the seal's OD), and the housing depth (this becomes the seal's Height). Then select the matching variant.

Example: a 50mm shaft in a 70mm bore with an 8mm housing depth = 50 × 70 × 8mm (≈ 1.97" × 2.76" × 0.31"). When in doubt, prioritize the shaft diameter (ID) — a seal that is too tight on the shaft will not seal; one that is slightly loose in the bore can be retained with sealant.

TC-type NBR skeleton seals are generally designed for low-to-medium pressure rotary shaft applications. They are typically rated for static pressures up to approximately 0.3 bar (4.4 psi). Dynamic pressure capability depends on shaft speed and surface finish. For higher-pressure hydraulic applications, a PTFE-lipped or spring-energized seal is generally more appropriate. Contact us to confirm suitability for your specific use case.

NBR rubber generally offers good resistance to petroleum-based oils, mineral greases, water splash, and mild weather exposure. The TC double lip design adds a secondary barrier against external moisture and dust, making it well-suited for agricultural equipment, outdoor machinery, and vehicle axle applications.

However, NBR is not recommended for prolonged immersion, ozone-rich environments, strong acids, or ketone-based fluids. For chemically aggressive or extreme outdoor conditions, a Viton (FKM) seal is typically a better choice.

These TC skeleton oil seals use metric dimensions and generally conform to ISO 6194 and DIN 3760 rotary shaft seal standards. They are designed to fit standard metric machined shafts and bores. Always verify that the ID, OD, and Height of the seal match your housing specifications before installation — do not assume cross-compatibility based on ID alone.

NBR (nitrile rubber) seals typically perform across a temperature range of approximately -40°C to +120°C (-40°F to +248°F). Short-term excursions slightly above this range may be tolerated, but sustained high temperatures will accelerate lip hardening and reduce seal life. For applications near engine exhausts, turbochargers, or other high-heat sources, a silicone or Viton (FKM) seal is generally recommended.

An SC-type (single lip) seal has one sealing lip that faces inward to retain lubricant. A TC-type (double lip) seal adds a second lip that faces outward, acting as a dust and contamination excluder. TC seals are generally preferred when the shaft environment includes dirt, dust, water spray, or other external contaminants — which is why they are the standard choice for gearboxes, axles, and agricultural equipment.

Yes — TC-type rotary shaft seals are among the most common seal types used in gearboxes, hydraulic pumps, agricultural PTO shafts, automotive rear axles, and industrial electric motors. Select the variant that matches your shaft diameter (ID), housing bore (OD), and housing depth (Height). If your application involves high shaft surface speeds (typically above 4–6 m/s), confirm that the seal lip material and design are rated for that speed before ordering.