TC FB Skeleton Oil Seal | NBR Double Lip Rotary Shaft Seal | ID 38–50mm

Measure three dimensions directly from your shaft and housing: the shaft inner diameter (I.D.), the housing bore outer diameter (O.D.), and the housing recess depth (Height) — all in millimeters. For example, a 40×60×10mm seal fits a 40mm shaft, a 60mm housing bore, and a 10mm deep recess. To convert: 40mm ≈ 1.57", 60mm ≈ 2.36", 10mm ≈ 0.39". Always measure before ordering rather than relying on part numbers from other brands.

TC-type skeleton oil seals are generally designed for low-to-medium pressure dynamic sealing. They typically handle shaft speeds up to around 4–8 m/s and pressures up to approximately 0.05 MPa under normal conditions. For high-speed spindles or high-pressure hydraulic circuits, a different seal type may be more appropriate — contact us to confirm suitability for your application.

NBR rubber offers good resistance to petroleum-based oils, greases, and incidental water splash, making it suitable for most gearbox and pump environments. However, NBR is generally not recommended for prolonged UV exposure or continuous water immersion. For fully outdoor or submerged applications, an FKM (Viton) seal would typically be a better fit.

These TC FB skeleton oil seals are dimensioned in metric (mm) and follow ISO 6194 / DIN 3760 standards. They are designed for metric shafts and housings. They are not intended for inch-standard shafts unless the metric dimensions happen to match your application. Always verify I.D., O.D., and height against your equipment's specifications before installing.

TC-type seals have a double lip: the primary sealing lip retains lubricant inside the housing, while the secondary dust lip prevents contaminants — dirt, dust, and moisture — from entering. If your application involves dusty, muddy, or wet conditions (such as agricultural equipment or outdoor machinery), a double-lip TC seal is generally the better choice over a single-lip SC seal.

NBR rubber typically performs reliably in a temperature range of approximately -40°F to +250°F (-40°C to +120°C). This covers most gearbox, motor, and pump operating environments. For applications with sustained temperatures above +250°F, consider an FKM (Viton) or silicone seal instead.

Both options are available on this listing. Select 1 pcs if you need a single replacement seal, or 5 pcs for a value pack — a cost-effective choice when building a maintenance kit or replacing multiple seals across a machine. The 5-pack price per seal is lower than buying individually.