Measure three dimensions with a caliper: the shaft outer diameter (this becomes the seal ID), the housing bore inner diameter (this becomes the seal OD), and the housing depth (this becomes the seal height). Match all three to the variant listed as ID × OD × Height. For example, a 200mm shaft in a 240mm bore with a 15mm housing depth needs the 200 × 240 × 15mm variant. Converting to inches: 200mm ≈ 7.87", 240mm ≈ 9.45", 15mm ≈ 0.59".

TC and FB are common industry designations for a double-lip radial shaft seal. The primary lip faces inward and retains lubricant (oil or grease) inside the housing. The secondary dust lip faces outward and generally keeps dirt, water, and debris from entering. This two-barrier design is the standard for rotating shafts in gearboxes, pumps, and axle housings.

NBR skeleton oil seals of this type are generally rated for low-to-moderate pressure applications — typically up to around 0.05 MPa (≈7 psi) in static conditions. They are designed for dynamic sealing on rotating shafts, not for high-pressure hydraulic lines. If your application involves elevated pressure, contact us to confirm suitability.

In most cases, yes. NBR (nitrile rubber) offers good resistance to water, petroleum oils, and many fuels, making it suitable for outdoor and wet environments. However, NBR is generally not recommended for prolonged exposure to ozone, strong UV radiation, or certain synthetic fluids (e.g., phosphate-ester hydraulic fluids). For harsh chemical environments, a Viton (FKM) seal is typically a better choice.

NBR skeleton oil seals are generally suitable for operating temperatures from approximately -40°F to +250°F (-40°C to +120°C). Shaft surface speeds are typically up to around 4–6 m/s, depending on shaft surface finish (Ra ≤ 0.8 µm recommended) and adequate lubrication at the lip. Contact us to confirm for your specific operating conditions.

Yes. All dimensions follow metric standards in millimeters, consistent with ISO and DIN shaft seal conventions. They are generally interchangeable with other TC/FB metric oil seals of the same ID × OD × Height from major manufacturers. Always confirm the three dimensions match your housing exactly before installation.

Follow these steps for a leak-free installation:

• Clean the housing bore and shaft journal thoroughly.
• Lightly lubricate the seal lip with the fluid being sealed (oil or grease).
• Press the seal squarely into the bore using a seal driver or flat plate — never hammer directly on the seal face or lip.
• Ensure the seal sits flush or slightly below the housing face.
• Protect the lip from sharp edges (keyways, threads, splines) during installation — use a sleeve or tape if needed.

Oil seals are wear items with a finite service life. Having spares on hand means you can complete a repair or scheduled service without waiting for a second shipment. The 2-pcs and 4-pcs options offer a lower per-unit cost and are practical for fleet maintenance shops, equipment dealers, or any application where the seal is replaced on a regular service interval.