TC Skeleton Oil Seal Ring | FKM Double Lip Rotary Shaft Seal | ID 41–50mm

Measure your shaft's outer diameter (this becomes the seal's ID), the housing bore diameter (this becomes the seal's OD), and the housing depth (this determines the thickness). For example, a 45mm shaft in a 62mm bore with 8mm housing depth needs a 45 × 62 × 8mm seal. When in doubt, match the exact OEM dimensions — typically expressed in mm as ID × OD × Thickness. If the old seal is available, measure it directly with calipers.

FKM (also marketed as Viton) is a fluoroelastomer that generally withstands temperatures from -20°C to +200°C (-4°F to +392°F) and resists petroleum oils, hydraulic fluids, fuels, and many industrial chemicals. It outperforms standard NBR (nitrile) rubber in high-heat or chemically aggressive environments — making it the preferred choice for gearbox, differential, and high-temperature motor shaft seals.

Yes. The double-lip (TC) design provides a secondary dust and moisture exclusion barrier, making these seals well-suited for outdoor machinery, agricultural equipment, and applications exposed to water splash, mud, or road debris. FKM also resists ozone and UV degradation better than standard rubber compounds, supporting longer service life in exposed installations.

TC-type rotary shaft seals are generally rated for shaft surface speeds up to approximately 4–8 m/s depending on size, lubrication, and shaft finish. They are designed for low-to-moderate pressure applications (typically up to 0.05 MPa / ~7 psi). For high-pressure hydraulic circuits, a different seal type (such as a hydraulic rod seal) is recommended.

Yes. All dimensions follow ISO 6194 / DIN 3760 metric standards. The ID range (41–50mm) fits standard metric shaft diameters and the OD is sized for standard metric housing bores. A shaft surface finish of Ra 0.2–0.8 µm is generally recommended for optimal sealing life and to avoid premature lip wear.

Use a seal driver or flat press plate sized to the OD — never hammer directly on the seal face or lip. Lightly lubricate the seal lip with clean oil before installation. Ensure the shaft has a chamfered lead-in (typically 15–20°) to avoid cutting the lip during assembly. Press squarely until the seal face is flush with or slightly below the housing surface. Inspect the lip for any nicks or distortion before final assembly.

This size range is commonly found in automotive rear axle and differential assemblies, agricultural tractor PTO shafts and gearboxes, industrial electric motors and pumps, compressors, and light construction equipment drivetrains. Always cross-reference with your OEM part number or measure the existing seal before ordering to confirm the exact ID × OD × Thickness required.