Marine Seal

Propeller Shaft Seal SRD-150

Our water-lubricated propeller shaft seal is a cost-effective and environmentally friendly solution that meets all technical needs for a modern mechanical marine seal. These include, among other things, a modular design, ease of installation, low maintenance requirements and no adjustment work.

Propeller shaft seals use the same function principle as mechanical seals. Therefore, they are virtually leakage free and leave no oil or grease residue in the waterway. The prevention of dirty water entry in the bilge is another feature of the STB propeller shaft seal, so there is no need for a cost and work intensive removal and disposal.

Optionally, we offer the enhancement with a Pneumostop. The Pneumostop enables the possibility to replace, repair or clean the mechanical seal and other components up to the Pneumostop on a standing shaft, without the need to go for a dockyard.

Base design

  • Single-acting mechanical seal
  • Cartridge unit
  • Group springs
  • Flush-access
  • Rotation-direction independent
  • Pressure sleeve



  • Shaft diameters from 60 mm to 280 mm



  • Shaft diameters greater than 280mm on demand
  • Pneumostop
  • Splited mechanical seal
  • Open system
  • Closed System



  • Flush access 1 l/h mm per shaft diameter


Temperature :

  • -5°C to +40°C



  • Up to 7 bar


Sliding speed:

  • Up to 10 m/s


Allowed axial movement:

  • ± 2,0 mm
  • After 180 mm shaft diameter ±3 mm



  • Seal face: antimony or synthetic resin carbon graphite
  • Stationary seat: special chrome molybdenum cast
  • Metal parts: 1.4571
  • Pressure sleeve: NBR (Nitril-Butadiene-Rubber)
  • Gasket: Burasil®

Propeller shaft seal for an open system

3D Pneumostop

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