Item Description
1/1.1 Seal face
2/2.1 Mating ring
3/3.1 Collar
4/4.1 Face housing
5/5.1 Clamp ring
6 Springs
7 Housing
8 Gasket
Axial stop

Type 4604


The water-lubricated stern tube seals for closed systems Type 4604 from EagleBurgmann are not alone an environment-friendly solution. They meet all technical requirements of modern sealing technology: modular design, convenient installation, little maintenance, no adjustments.
Type 4604 water-lubricated stern tube seals are virtually leak-free and are leaving no oil or grease residues in the waterway. And because they prevent getting water into the bilge, no elaborate actions are required for its disposal. Please ask us for references.


  • For closed systems
  • Water-lubricted
  • No oil or grease emissions to the environment
  • Low power consumption
  • Carbon seal face unsplit for first installation, split for repairs
  • Version with split mating ring available

Operating range

Shaft diameter:
d1 = 50 … 320 mm (1.97" … 12.60")
Water pressure: p = max. 2 bar (29 PSI)
Barrier pressure: min. 0.2 bar (2.9 PSI) above water pressure
t = -5 °C … 40 °C (23 °F… 104 °F)
Speed range: n = see diagram

Allowed shaft movements
Axial: ±5 mm,
Radial: Shaft diameter (d1) up to 200 mm: ±2 mm,
>200 mm: ±3 mm

Flushing: approx. 1 l/h per Millimeter of shaft diameter (d1)


Seal face:
Carbon graphite antimony impregnated (A),
Carbon graphite resin impregnated (B)
Mating ring: Special cast CrNiMo steel (S) / 1.4462
Collar: Nitrile-butadiene rubber (P)
Face housing, clamp ring: CrNiMo steel (G)
Springs: Hastelloy® C-4 (M) /1.4401
Housing: 1.4571 / Bronze
Gasket: Burasil® (Y)


  • Version with split mating ring available