TC Oil Seal NBR Nitrile Rubber Double Lip Rotary Shaft Seal — 10-Pack

Measure three dimensions: the shaft diameter (= inner diameter of the seal), the housing bore diameter (= outer diameter of the seal), and the housing depth (= seal thickness). For example, a 25 x 40mm seal has a 25mm inner diameter and 40mm outer diameter — roughly 0.98" x 1.57". Always measure the existing seal or housing before ordering. When in doubt, err toward the exact OEM dimension rather than rounding up.

These seals are made from NBR (Nitrile Butadiene Rubber), which is generally compatible with petroleum-based oils, hydraulic fluids, and greases. NBR typically handles temperatures from approximately -40°F to +250°F (-40°C to +120°C). For applications involving ozone, UV exposure, or aggressive solvents, a Viton (FKM) seal may be more appropriate.

The TC double lip design features a primary sealing lip that retains lubricant inside the housing and a secondary dust lip that blocks contaminants (dirt, water, debris) from entering. This dual-barrier construction is commonly used in gearboxes, pumps, differentials, and axle assemblies where both oil retention and contamination exclusion are critical.

NBR rubber generally offers good resistance to water, oils, and mild chemicals, making these seals suitable for many outdoor and wet applications such as agricultural equipment and marine auxiliary systems. However, for highly aggressive environments involving ozone, strong UV, or concentrated solvents, a Viton or PTFE-lipped seal may be more appropriate. Contact us to confirm for your specific application.

TC-type NBR oil seals are typically rated for shaft surface speeds up to approximately 4–6 m/s (800–1,200 ft/min) under normal lubricated conditions. Actual performance depends on shaft surface finish (Ra typically ≤0.4 µm recommended), shaft runout, alignment, and operating temperature. For high-speed applications, contact us to confirm suitability.

1. Clean the housing bore and shaft thoroughly. 2. Lightly lubricate the seal lip with the fluid being sealed. 3. Press the seal squarely into the bore using a seal driver or flat plate — never hammer directly on the seal face. 4. Ensure the primary lip faces the fluid side (inward). 5. Check that the seal sits flush or slightly below the housing face. Misalignment during installation is the most common cause of early seal failure.

Yes. All dimensions listed (inner diameter, outer diameter, thickness) follow metric standards in millimeters, consistent with ISO and DIN shaft seal conventions commonly used in automotive, agricultural, and industrial equipment. These are not inch-standard seals — if your equipment uses imperial dimensions, please convert and verify before ordering.