TC TG Oil Seal Skeleton FKM Rubber Framework Double Lip Sealing Ring 145-245mm

Measure three dimensions directly from your shaft and housing: (1) the shaft outer diameter — this is the Inner Ø of the seal; (2) the housing bore diameter — this is the Outer Ø; (3) the available axial depth in the housing — this is the Depth. Match all three to the variant label shown as Inner Ø × Outer Ø × Depth (mm). If your measurements are in inches, multiply by 25.4 to convert to millimeters. When in doubt between two depths, choose the shallower one to avoid bottoming out in the housing.

Both TC and TG designations describe double-lip skeleton oil seals with a metal framework. The primary difference lies in the secondary lip geometry and the presence or absence of a garter spring on the dust lip. In practice, TC and TG seals with identical Inner Ø × Outer Ø × Depth dimensions are dimensionally interchangeable in most housing applications. If your OEM part number specifies one type, confirm the depth and lip orientation before substituting.

NBR (nitrile) seals are adequate for standard petroleum oils at moderate temperatures (up to roughly 100–120 °C). FKM (Viton) seals are the correct choice when the operating temperature regularly exceeds 120 °C, when the lubricant is a synthetic ester or PAO, or when the seal contacts mild acids, fuel, or aggressive chemicals. FKM also resists ozone and UV degradation better than NBR, which matters in outdoor equipment that sits idle between seasons.

Yes. The outward-facing secondary (dust exclusion) lip creates a low-contact-force barrier against water spray, mud, and fine particulates. It is not designed to seal against pressurized water ingress — for that, a labyrinth or V-ring seal would be added upstream. For typical agricultural, construction, and industrial gearbox applications where splash and airborne contamination are the concern, the double-lip design provides meaningful protection compared to a single-lip seal.

Clean the housing bore and lightly lubricate the outer diameter of the seal with the same oil it will retain. Use a flat-faced driver or a seal installation tool sized to contact the outer metal case — never strike the rubber lip or the inner edge. Press evenly and squarely until the seal face is flush with or just below the housing face. Avoid cocking the seal during installation, as even a slight tilt can cause the primary lip to run off-center on the shaft, leading to early leakage.

These are dynamic rotary shaft seals designed for continuous shaft rotation. The garter spring (on the primary lip) maintains consistent radial contact force as the shaft turns. They are not intended for reciprocating (back-and-forth linear) motion — a different seal profile is required for that duty. Shaft surface finish in the contact zone should ideally be Ra 0.2–0.8 µm (8–32 µin) for optimal seal life; a rough or scored shaft surface will accelerate lip wear.

For seals in this diameter range, a shaft surface hardness of HRC 30 or above is recommended to resist lip-induced wear grooving over time. Shaft surface finish should be Ra 0.2–0.8 µm. Peripheral shaft speed suitability depends on the specific size and lubricant viscosity — for large-diameter shafts (200 mm+), lower surface speeds are typical. If your application involves high shaft speeds, contact us to confirm suitability before ordering.