Stern tube seals are critical components in marine propulsion systems, preventing seawater ingress and lubricant leakage. They ensure smooth operation of the propeller shaft while maintaining environmental protection. These seals are designed to withstand harsh marine conditions and require regular maintenance for optimal performance.

Size: Typically ranges from 100 mm to 1000 mm in diameter, depending on vessel size.

Grade: Commonly classified under marine-grade sealing standards like ISO 6194 or DIN 3760.

Viscosity: Lubricating oil viscosity usually between ISO VG 68 to ISO VG 220.

Buoyancy: Designed to withstand hydrostatic pressures up to 3-4 bar, depending on application.

Material: Primary sealing materials include nitrile rubber (NBR), polyacrylate (ACM), or fluorocarbon (FKM) for high-temperature resistance.

Operating Temperature: -20°C to +120°C, with high-grade seals reaching up to +150°C.

Pressure Rating: Typically 2-6 bar, with heavy-duty seals rated higher.

Compatibility: Resistant to seawater, oils, and mechanical wear.

Design Types: Lip seals, face seals, or radial shaft seals, depending on propulsion system requirements.

Certifications: Often comply with ABS, DNV, or LR marine standards.

Stern Tube Seals, Marine Propulsion products typically comply with maritime standards such as ISO 21072, ISO 15738, and other relevant classification society standards like ABS, DNV, LR, and BV.