Measure three dimensions: the shaft diameter (= ID), the housing bore diameter (= OD), and the housing depth (= Height/Thickness). Match all three to the variant label shown as ID × OD × Height. For example, a 200*240*18mm seal fits a 200mm (≈7.87") shaft, a 240mm (≈9.45") bore, and an 18mm (≈0.71") housing depth. When in doubt, prioritize the shaft diameter — it is the most critical fit dimension.

TC denotes a double-lip design: a primary sealing lip that retains oil or grease and a secondary dust-exclusion lip that keeps contaminants out. FB refers to the metal case construction style. Together they provide reliable sealing in both directions and are generally suitable for moderate-speed rotating shafts in gearboxes, pumps, and axle assemblies.

TC-type NBR lip seals are typically rated for low-to-moderate shaft speeds and static pressures up to approximately 0.05 MPa (7 psi). They are not designed for high-pressure hydraulic circuits. Contact us to confirm suitability for your specific operating speed and pressure conditions.

NBR rubber generally offers good resistance to water, mineral oils, and greases, making it suitable for many outdoor and wet-environment applications such as agricultural equipment and marine auxiliary machinery. However, NBR is not recommended for prolonged exposure to ozone, UV radiation, or aromatic/synthetic fuels. For those conditions, a Viton (FKM) seal is typically a better choice.

Yes. All dimensions follow metric standards in millimeters. They are compatible with any metric shaft and housing that matches the listed ID, OD, and Height. For inch-based systems, divide the inch measurement by 25.4 to get millimeters — for example, a 10" bore = 254mm, so the 250*280*18mm or 250*290*18mm variant would be the closest candidates to verify.

Follow these steps for a leak-free installation:

• Clean the housing bore and shaft journal thoroughly.
• Lightly lubricate the seal lip with the fluid it will retain (oil or grease).
• Press the seal squarely into the bore using a seal driver or flat plate — never strike the seal face directly.
• Orient the open (spring) side of the lip toward the fluid being retained.
• Protect the lip from keyways or splines during installation using a sleeve or tape.

NBR rubber typically performs reliably from approximately -40°F to +250°F (-40°C to +120°C). Sustained exposure above this range can cause the rubber to harden and crack, leading to seal failure and lubricant leakage. For higher-temperature applications, consider a silicone or Viton alternative.