Measure three dimensions with calipers: (1) the shaft outer diameter — this equals the seal's ID; (2) the housing bore inner diameter — this equals the seal's OD; (3) the housing depth — this equals the seal's width. Match all three to the variant label (ID×OD×Width). For example, an 8×22×7mm seal fits an 8mm shaft (≈5/16"), a 22mm bore (≈7/8"), and a 7mm deep housing (≈9/32"). When replacing an existing seal, the dimensions are usually stamped or molded on the seal face.

TC-type double-lip seals are generally designed for low-to-moderate shaft speeds and oil pressures. They are typically suitable for dynamic sealing up to around 0.3 MPa (≈44 psi) and shaft surface speeds up to approximately 4–8 m/s depending on shaft finish and lubrication. For high-speed spindles or high-pressure hydraulic circuits, a different seal type may be more appropriate — contact us if you need guidance.

Yes, in most cases. The secondary dust lip on TC seals is specifically designed to exclude water, mud, and airborne contaminants, making them a common choice for outdoor power equipment, agricultural machinery, and ATVs. For applications involving prolonged submersion or salt-spray exposure, verify that NBR is compatible with the specific fluids and environment, or consider a FKM (Viton) lip material if available.

These seals follow ISO 6194 / DIN 3760 metric standards, making them direct replacements for OEM metric shaft seals in European and Asian-manufactured equipment. They are dimensioned in millimeters and are not designed as drop-in replacements for inch-standard (SAE) seals unless the metric dimensions happen to match. Always verify ID, OD, and width in millimeters before ordering.

TC seals (this product) have two lips — a primary oil-retention lip with a garter spring and a secondary dust exclusion lip. SC seals have a single lip with a spring, suitable when contamination exclusion is less critical. VC seals are springless single-lip seals used in low-speed or low-pressure applications. For most general-purpose shaft sealing where both oil retention and dirt exclusion matter, TC is typically the correct choice.

Follow these steps for a clean installation: (1) Clean the housing bore and remove any burrs or corrosion. (2) Lightly coat the seal lip and outer diameter with clean engine oil or assembly grease. (3) Start the seal squarely in the bore by hand. (4) Press it flush using a flat driver, socket, or dedicated seal installation tool that contacts only the outer metal case — never strike the seal face or lip directly. (5) After installation, confirm the garter spring is still seated in its groove by gently inspecting the lip. Install with the spring side facing the oil.

Each order ships 20 pieces (pcs) of your selected size. Shaft seals are a high-wear consumable — having a set on hand means you can complete the current repair and stock spares for the next service interval without waiting for another order. For workshops, fleet maintenance operations, or anyone servicing multiple machines of the same model, a 20-piece set is a practical and cost-effective quantity.