06/11/2026
One small ring. Zero oil leaks.
Spring-loaded rotary shaft seals are the quiet workhorse inside every gearbox, motor and pump shaft. They look simple — a rubber ring with a garter spring around the lip — but picking the wrong one costs you a seized bearing, a contaminated housing and a warranty claim.
Our line covers five profiles:
🔹 TC— double-lip, rubber-covered OD. The general-duty default. Primary lip holds oil, secondary lip keeps dust out. Built for gearboxes, motors, conveyors and anything that lives outdoors.
🔹 SC— single-lip, rubber-covered OD. Same profile, no dust lip. For clean indoor gearboxes where you don‘t need the second lip.
🔹 TB— double-lip, exposed metal shell. Slides into heavy cast-iron housings where the rubber-covered OD would walk out under vibration. Large shafts, agriculture equipment, heavy-duty pumps.
🔹 SB— single-lip, metal shell. Clean heavy-duty pump shafts.
🔹 TCV— reinforced double-lip for hydraulic pumps and motors where housing pressure reaches 0.5 MPa. Standard TC tops out at 0.05 MPa; don’t use it on a hydraulic circuit.
Material matters as much as the profile:
▪️ NBR — general mineral oil, grease, diesel, −30°C to +100°C, ≤12 m/s
▪️ ACM — hot transmission oil, −20°C to +140°C
▪️ HNBR — high-temp mineral oil, ozone, −30°C to +150°C
▪️ FKM — synthetic oils, aggressive media, −20°C to +190°C
▪️ EPDM — water, glycol, coolants (not for mineral oil)
We stock standard shaft sizes from 15 mm up to 100 mm, and cut non-standard dimensions from your drawing or a physical sample. FA sample before mass production, so you can verify fit on your actual housing.
DM us your shaft × bore × width (mm), the medium and the temperature — we‘ll send the right profile and a quote same day.
🔗 chuncotechrubber.com/heavy-duty-spring-loaded-rotary-shaft-seals/
