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Spare Parts
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Stern Tube Seal Suppliers
The stern tube seal sits where the propeller shaft leaves the hull, holding the sea out and the lubricating oil in. It is a wear part by design, and when the daily oil consumption starts to climb or a weep shows in the drain tank, the fix is almost always a set of seal elements rather than a whole new assembly. Stern tube seal suppliers deal in those maker-specific parts - the lip rings, springs, and kits that renew a seal against the exact unit fitted. On this part, matching the spare to the seal maker, model, and shaft diameter is the whole job, because a stern tube seal is a precision component and not a generic ring.
How the Seal Works
Most merchant ships run oil-lubricated seals at both ends of the stern tube. The aft seal keeps seawater out while the header tank holds the oil at a pressure just above the sea outside, so any weep runs slightly outward rather than letting water in; the forward seal keeps oil from escaping inboard. That balance is why the seal is watched through oil consumption: a rising trend is usually the seal talking, long before anything shows in the bilge, and it is the signal that the elements are due for renewal.
Seal Types and Their Spares
The type decides the parts. Radial lip seals - the Wartsila (Simplex), Kemel, and Cedervall pattern - run several elastomer lip rings against a chrome liner on the shaft, and the rings are the wear item. Air-type seals add an air chamber between oil and sea to stop any oil reaching the water, a design pushed by environmental rules. Face or mechanical seals, such as the Lagersmit type, seal axially and carry their own faces and springs. Water-lubricated stern tubes run their own seals from makers like Thordon and Duramax. Each family has a different spares list, so the seal actually on the ship, not the broad category, defines the order.
What Actually Gets Ordered
For the common lip seal, the order is usually a set of seal rings with their garter springs, the O-rings and retaining hardware, and often the maker's complete overhaul kit rather than single rings. The elastomer compound matters as much as the size: it has to suit the oil in the system, and the shift to environmentally acceptable lubricants has turned compound compatibility into a checked item rather than an assumption. Given the seal maker, the model, and the shaft diameter, a supplier can identify the exact kit.
Renewing Without Drawing the Shaft
One reason the spares matter is that many lip seals can be renewed without withdrawing the tailshaft. Split seal rings are bonded in place with the shaft still in the tube, which turns a docking-scale job into an afloat one, and the parts have to be the split, bondable type for that to work. The fitting itself is specialist work handled by stern tube seal renewal services, and ordering the right bondable kit against the seal fitted is what lets that work go ahead without a wait.
Give the seal maker and model, the shaft diameter, and the oil type in the system - mineral or an environmentally acceptable grade - and stern tube seal suppliers can quote the correct rings or kit instead of a near-match that weeps within the season.

Year Founded: 2018
VerifiedCATEGORIES:
Stern Tube Seals
15 PPM Monitoring Equipment
AIS (Automatic Identification Systems)
AMS (Alarm Monitoring Systems)
ARPA (Automatic Radar Plotting Aids)
AUS (Automatic Unloading Systems)
Accommodation Ladder Davits
Accomodation Ladders & Gangways
Air Compressors
Air Driven Motors
(190)
CLASS APPROVED:
IACS: ABS, ClassNK, CCS, BV
WAREHOUSES:
China

Year Founded: 2011
VerifiedCATEGORIES:
Stern Tube Seals
15 PPM Monitoring Equipment
AIS (Automatic Identification Systems)
AMS (Alarm Monitoring Systems)
ARPA (Automatic Radar Plotting Aids)
(177)
BRAND:
RM Propulsion
VEEM
AEGIR
BRUNVOLL
KOBELCO
(50)
CLASS APPROVED:
IACS: DNV
WAREHOUSES:
Singapore
United Arab Emirates
Angola
Austria
Australia (209)

Year Founded: 2004
VerifiedCATEGORIES:
Stern Tube Seals
15 PPM Monitoring Equipment
AIS (Automatic Identification Systems)
AMS (Alarm Monitoring Systems)
ARPA (Automatic Radar Plotting Aids)
AUS (Automatic Unloading Systems)
Accommodation Ladder Davits
Accomodation Ladders & Gangways
Air Compressors
Air Driven Motors
Air Horns
Air Reservoirs
Air Starters
Alpha Lubrication Systems
Anemometers
(162)
CLASS APPROVED:
IACS: ClassNK, BV

Year Founded: 2025
VerifiedCATEGORIES:
Stern Tube Seals
15 PPM Monitoring Equipment
AIS (Automatic Identification Systems)
AMS (Alarm Monitoring Systems)
ARPA (Automatic Radar Plotting Aids)
AUS (Automatic Unloading Systems)
Accommodation Ladder Davits
Accomodation Ladders & Gangways
Air Compressors
Air Driven Motors
Air Horns
Air Reservoirs
Air Starters
Alpha Lubrication Systems
Anemometers
(166)
WAREHOUSES:
Hong Kong

Year Founded: 2020
RM verifiedCATEGORIES:
Stern Tube Seals
Air Compressors
Air Driven Motors
Air Horns
Air Starters
Alpha Lubrication Systems
Automation Control Equipment & Control Units
BackWash Filters
Boiler Automation Equipment
Centrifugal Pumps
Control Air Dryers
Cranes
Diesel Generators
Distance Rings & Spacer Rings for Stern Tube
Engine Fuel Injection High Pressure Pipes (2-Strok
(66)
WAREHOUSES:
Turkey
China
Greece
Japan
South Korea (1)

Year Founded: 2010
RM verifiedCATEGORIES:
Stern Tube Seals
15 PPM Monitoring Equipment
Accommodation Ladder Davits
Accomodation Ladders & Gangways
Air Compressors
Air Driven Motors
Air Horns
Air Reservoirs
Air Starters
AIS (Automatic Identification Systems)
Alpha Lubrication Systems
AMS (Alarm Monitoring Systems)
Anemometers
Anti-Heeling Systems
ARPA (Automatic Radar Plotting Aids)
(166)
CLASS APPROVED:
IACS: ABS, RINA, ClassNK, CCS, BV, CRS, PRS, KR, LR, DNV, IRS
Non-IACS: RMRS, HRS, Other

Year Founded: 2016
RM verifiedCATEGORIES:
Stern Tube Seals
Stern Tube Liner (Bearings)
CLASS APPROVED:
IACS: CCS, KR, DNV
CATEGORIES:
Stern Tube Seals
Stern Tube Liner (Bearings)
Distance Rings & Spacer Rings for Stern Tube
Propeller Shaft Bearings
Line Shaft Bearings
(1)
CLASS APPROVED:
IACS: RINA, ClassNK, CCS, BV, KR, LR, DNV, IRS
WAREHOUSES:
China
CATEGORIES:
Stern Tube Seals
15 PPM Monitoring Equipment
AIS (Automatic Identification Systems)
AMS (Alarm Monitoring Systems)
Accomodation Ladders & Gangways
Air Compressors
Air Driven Motors
Automation Control Equipment & Control Units
BWTS (Ballast Water Treatment Systems)
BNWAS (Bridge Navigational Watch Alarm Systems)
Boat Engines
Boiler Automation Equipment
Centrifugal Pumps
Communication Equipment
Compass (Gyro & Magnetic)
(91)
WAREHOUSES:
Turkey

Year Founded: 2014
CATEGORIES:
Stern Tube Seals
15 PPM Monitoring Equipment
AIS (Automatic Identification Systems)
AMS (Alarm Monitoring Systems)
ARPA (Automatic Radar Plotting Aids)
AUS (Automatic Unloading Systems)
Accommodation Ladder Davits
Accomodation Ladders & Gangways
Air Compressors
Air Driven Motors
Air Horns
Air Reservoirs
Air Starters
Alpha Lubrication Systems
Anemometers
(168)
WAREHOUSES:
Egypt

