Skeleton shaft oil seals are one of the most critical sealing components in mechanical equipment, widely used in engines, gearboxes, hydraulic systems, pumps, and automotive machinery.

Skeleton oil seals are indispensable core sealing components in modern mechanical manufacturing, widely applied to rotating shafts of automobiles, hydraulic equipment, industrial motors, engineering machinery and other devices. Their primary functions include locking internal lubricants, preventing oil leakage, and isolating external dust, moisture and corrosive impurities to extend the service life of mechanical parts. TC, SC and VC are the three most mainstream types of inner skeleton oil seals in the global market. Due to similarities in external appearance and installation methods, many engineers and procurement personnel often encounter difficulties in type selection, which may trigger sealing failure, equipment downtime and increased maintenance costs. This article systematically elaborates on the structural characteristics, core differences, pros and cons of TC, SC and VC skeleton oil seals, and clarifies their applicable working conditions to provide reliable references for targeted type selection in practical engineering projects.

SPNC is a PTFE composite rod seal used for hydraulic and pneumatic piston rods. With a combination of filled PTFE sliding ring and rubber energizer, it features low friction, excellent wear resistance and stable sealing performance. It adapts to high pressure and various media, and is widely used in different types of mechanical equipment.

DAS is a high-performance composite shaft seal for hydraulic reciprocating shafts, integrating sealing, wear resistance and dust protection. With ultra-low friction, strong anti-extrusion ability and long service life, it fits narrow grooves and adapts to diverse harsh working conditions. Standard sizes are in stock, and non-standard customization is available.

LBH is an integrated dual-lip seal combining dust protection and fluid sealing for hydraulic cylinders. Featuring one-piece all-rubber structure with NBR/FKM material options, it offers 99% contaminant blocking efficiency, high pressure resistance and easy installation. Widely used in heavy-duty machinery, with full standard stock and customization available.