Rotary Union FAQ

A rotary union (also called a rotary joint or rotating union) transfers fluid or gas from a stationary supply into a rotating shaft or drum. It uses precision seals and bearings to maintain a leak-free connection while the machine rotates.

Water, coolant, compressed air, vacuum, steam, thermal oil and hydraulic oil. The seal material and housing construction are selected to match your media, pressure and temperature.

Send us four parameters: medium (fluid type), pressure, speed (RPM) and port size. We will recommend the series, seal material and mounting style from our catalog.

Yes — our Deublin replacement series is built to the same mounting dimensions, thread sizes and seal geometry as the equivalent Deublin part number, at factory-direct pricing.

Standard catalog items have no MOQ — order a single unit for replacement. For OEM and custom-engineering projects, MOQ starts at 100 units per year.

Standard sizes ship in 7–15 days. Custom-engineered unions take 3–4 weeks from drawing approval. Prototypes for OEM projects can be delivered in 2–3 weeks.

Yes. We build private-label rotary unions to your drawings, with your brand and packaging, from prototype to production volumes.

All rotary unions carry a 12-month warranty against manufacturing defects. Seal kits and rebuild services extend the life of your existing units.