Measure three dimensions: the shaft outer diameter (this is the seal ID), the housing bore inner diameter (this is the seal OD), and the axial groove depth (seal width). This listing covers shaft IDs from 12mm (≈0.47") to 29mm (≈1.14"). Select your size from the variant options above. If you are working from an OEM part number, contact us and we can cross-reference it.

TC-type rotary shaft seals are generally designed for low-to-medium pressure environments. They typically handle lip contact pressures up to around 0.3 MPa (≈43 psi) under normal operating conditions. For high-pressure hydraulic circuits, a different seal type (such as a lip seal with a backup ring) is generally recommended.

NBR offers good resistance to petroleum-based oils, greases, and water splash. The double-lip design adds a secondary dust lip that helps exclude moisture and contaminants — making these seals a solid choice for outdoor equipment like lawn tractors, tillers, and small engines. For prolonged submersion or exposure to aggressive chemicals, a Viton (FKM) seal is generally more appropriate.

TC FB skeleton oil seals follow metric dimensional standards (ISO 6194 / DIN 3760 Type A). They are compatible with metric shafts and housings in the 12–29mm ID range. Always verify the OD and width against your housing bore before installation. These are not inch (imperial) seals — if your application uses inch dimensions, please contact us to confirm cross-compatibility.

NBR compound typically performs reliably from approximately -40°C (-40°F) to +120°C (+248°F). Short-term excursions up to +130°C may be tolerated, but sustained high-temperature operation above this range can accelerate lip wear and reduce seal life. If your application runs consistently above 120°C, consider a Viton (FKM) or PTFE-lipped seal instead.

NBR is generally compatible with mineral-based oils, ATF, and most common gear oils. Compatibility with fully synthetic PAO or ester-based fluids varies — in most cases NBR performs adequately, but prolonged exposure to aggressive synthetics may cause slight swelling. Verify fluid compatibility with your specific oil before installation, or contact us if you are unsure.

Clean the housing bore and shaft. Lightly lubricate the seal lip with the fluid being sealed. Press the seal squarely into the bore using a seal driver or a flat plate — never hammer directly on the seal face. Ensure the primary lip faces the oil side and the dust lip faces outward. Check that the seal sits flush or just below the housing face.