U-Cup Seals

APG’s U-cup seals are single-acting sealing elements used in hydraulic cylinder applications where reliable fluid sealing, low friction, and good wear resistance are important. Since this category is specifically for U-cup seals without an O-ring energizer, which makes these a great choice for light- to medium-duty sealing applications, distinct from the separate loaded lip seal category. That distinction matters because many supplier catalogs use “loaded U-cup” language when an O-ring energizer is present, while standard single-acting polyurethane U-cups are often sold as stand-alone sealing elements.