Measure your shaft's outer diameter — this becomes the seal's ID. Measure the bore housing inner diameter — this becomes the seal's OD. The width should match or be slightly less than your housing depth. For example, a 25mm shaft running in a 47mm bore with a 7mm housing depth calls for a 25×47×7mm seal. When in doubt, consult your equipment's service manual or OEM parts diagram.

TC refers to the rubber-covered outer case construction, which helps the seal grip the bore housing and resist spinning. Double lip means the seal has two sealing lips: a primary spring-loaded lip that retains oil or grease on the inboard side, and a secondary dust lip that blocks contaminants from entering from the outside. This dual-action design is generally more effective than single-lip seals in dirty, wet, or high-contamination environments.

TC-type radial shaft seals are typically designed for low-to-moderate shaft speeds and standard atmospheric pressure differentials. They are generally not rated for high-pressure hydraulic circuits. For specific pressure and speed ratings relevant to your application, refer to your equipment's OEM specifications or contact us before ordering.

Nitrile rubber (NBR) — the most common compound for TC oil seals — generally offers good resistance to petroleum-based oils, grease, and moderate moisture exposure. For prolonged outdoor use, UV exposure, or contact with aggressive chemicals (fuels, solvents, or synthetic fluids), confirm the seal compound before installation. Contact us if you need an alternative material such as FKM (Viton) for higher chemical or temperature resistance.

These are metric-dimensioned TC oil seals following standard ISO/DIN radial shaft seal sizing. They are designed for metric shafts and metric bore housings. They are not interchangeable with inch-standard (imperial) seals unless the metric dimensions happen to coincide with an imperial equivalent. Always verify ID, OD, and width against your actual shaft and housing measurements before ordering.

Clean the bore housing and shaft thoroughly. Lightly lubricate the seal lip with the fluid it will be sealing (oil or grease). Press the seal squarely into the housing using a seal driver or a flat block — never hammer directly on the seal face. The open (spring) side typically faces inward toward the lubricant source. If the shaft has a keyway, spline, or sharp chamfer, use a installation sleeve or tape to protect the lip during fitment. A nicked lip will leak immediately.

Shops, fleet maintenance teams, and equipment rebuilders typically work through seals in volume. Buying a 20-pack lowers the per-unit cost, ensures you have spares on hand for future rebuilds, and reduces downtime from waiting on reorders. It's a practical choice for anyone doing recurring maintenance on gearboxes, axles, pumps, or agricultural equipment where the same seal size appears across multiple machines.