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Stern Tube Seals

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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.

  • SEASTAR (HK) TRADE LIMITED logo

    Year Founded: 2018

    Verified

    SEASTAR (HK) TRADE LIMITED

    Verified

    providing original spare parts for main engines, auxiliary machinery, engine room equipment, and deck auxiliary systems to domestic and international shipowners and management companies. competitive pricing Our global service network and professional logistics team ensure timely delivery of your spare parts to designated ports and destinations. Heat Exchanger Galley Equipment Electric motor Deck Crane Grab Windlass Mooring Winch Hatch Cover Gangway Ladder Winch Steering Gear Pintle Bush Synthetic Phenol Resin Valve Fire Alarm Detector Navigation Communication Equipment Water Ingress Alarm System Electrical Instrument and Automation Fuel Valve Test Device Main Engine Auxiliary Engine Turbocharger Air Compressor M/E Auxiliary Blower Pumps Boiler Incinerator Fresh Water Generator Oily-water Separator Sewage Water Treatment Plant 15ppm Bilge Alarm Fuel Oil supply Module Purifier Refrigeration and Air Conditioning

    supply@seastartrade.com

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    • Stern Tube Seals

    • 15 PPM Monitoring Equipment

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    • Air Driven Motors

      (190)

    CLASS APPROVED:

    IACS: ABS, ClassNK, CCS, BV

    WAREHOUSES:

    • China

  • Japan Marine (S) Pte ltd logo

    Year Founded: 2011

    Verified
    Verified

    We have listed our Key Strength Equipments as below for easy reference. We are strong in Main engines Aux Engines /Generators Compressors Main Air , Breathing , Refrigeration, Marine Pumps Purifiers /Separator Hatch Cover Spares / Hydraulic spares Electrical Hydraulic Motors Air horns Toilet Vacuum Systems Electrical spares and small components A/C Compressors HVAC system spares Boiler and Incinerators https://jmsgroup.jp/products/

    jmsgroup.jp
    operations@jmsgroup.jp

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    • Stern Tube Seals

    • 15 PPM Monitoring Equipment

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    • RM Propulsion

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    • KOBELCO

      (50)

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    IACS: DNV

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    • Singapore

    • United Arab Emirates

    • Angola

    • Austria

    • Australia (209)

  • ARK MARINE SERVICE INC. logo

    Year Founded: 2004

    Verified
    Verified

    We specialize in providing original equipment supplies, primarily for main and auxiliary engine spares. As a factory-based company, we ensure the best pricing without compromising on quality. Our dedicated logistics team handles all deliveries efficiently, offering competitive rates for air, sea, and courier services.

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    • Stern Tube Seals

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      (162)

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    IACS: ClassNK, BV

  • MARINE INDUSTRIAL GROUP LIMITED logo

    Year Founded: 2025

    Verified
    Verified

    SUPPLIER OF OEM , ORIGINAL , OR SECOND HAND OF MARINE PARTS -Marine oil Lubricants -Marine Engines -Pumps -Main Engine -Auxiliary Engine/Generator -Engine Spares -Propeller -Hydraulics -Pumps Spares -Oil Purifier Spares -Heat Exchanger -Air Compressors Spares -Turbo Chargers Spares Marine Industrial Group: Excellence in Marine Solutions With a commitment to superior service and quality products, Marine Industrial Group is your go-to source for marine engineering supplies. We specialize in ship spare parts and auxiliary systems. MIG- Marine Industrial Group Limited

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    • Stern Tube Seals

    • 15 PPM Monitoring Equipment

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      (166)

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    • Hong Kong

  • Focus Marine Ltd. logo

    Year Founded: 2020

    RM verified
    RM verified

    We supply marine spare parts as our core business from our reliable partners/makers all over the World. Our parts are equivalent products NON-GENUINE unless otherwise stated. A part of scope of supply mentioned below as per engine types. 5L16/24, 5L21/31, 6L23/30H, 8L23/30, 5L28/32H, 7L32/40, 16V32/40-Non CD 16V32/40-CD, 6S60 MC-C, 7S60MC-C Mk7 6N18AL-V, 6N21AL-SV, 6DK20 TC : TCA66, TCA44, NR34/S148, NR20/R, RH183, TPL67-C33 SPARE PARTS : 2/4 STROKE ENGINE SPARE PARTS - MAN BW MAN SULZER WARTSILA KOBE AKASAKA DAIHATSU YANMAR HANSHIN HIMSEN - CUMMINS TURBOCHARGERS - IHI, MITSUBISHI, MAN, NAPIER, ABB, KBB AIR COMPRESSORS - TANABE, YANMAR, SPERRE, SAUER, TEIKOKU, TAMROTOR SEPARATOR - ALFA LAVAL, WESTFALIA, MITSUBISHI PUMPS - ALLWEILER, NANIWA, DESMI, SHINKO, TEIKOKU, ISHII, SHIN SHIN PHE SPARE PARTS - SWEP, TRANTER, SONDEX, ALFA LAVAL, GEA, APV, HISAKA FILTERS - BOLL KIRCH, MOATTI

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    • Cranes

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    • Distance Rings & Spacer Rings for Stern Tube

    • Engine Fuel Injection High Pressure Pipes (2-Strok

      (66)

    WAREHOUSES:

    • Turkey

    • China

    • Greece

    • Japan

    • South Korea (1)

  • NEW CHANNEL CHINA INTERNATIONAL CO LTD logo

    Year Founded: 2010

    RM verified
    RM verified

    SHIP SPARE PARTS, SHIP EQUIPMENT, ALTERNATIVE SOLUTIONS, SHIP REPAIR, INSPECTION SERVICES, SHIP REPAIR BROKER, OFFSHORE EQUIPMENT, CONSUMERABLES, PROVISIONS, ON-SITE SUPPLY SERVICE PROVIDER, TECHNICAL TEAM FOR ASSISTANCE

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    • Stern Tube Seals

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    • AIS (Automatic Identification Systems)

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    • ARPA (Automatic Radar Plotting Aids)

      (166)

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    IACS: ABS, RINA, ClassNK, CCS, BV, CRS, PRS, KR, LR, DNV, IRS

    Non-IACS: RMRS, HRS, Other

  • ShangHai seallock marine service Co.,Ltd logo

    Year Founded: 2016

    RM verified
    RM verified

    Stern tube Seal rings 155 to 1180 mm Suitable for all common shaft speeds and vessel draughts Seawater-proof stainless steel and hastelloy springs Are available for all major OEM makers Liners 155 to 1180 mm High-quality chrome steel to reduce wear Can fit any type of inboard or outboard lip-type seal Distance rings 155 to 1180 mm For installation between stern tube and aft seal housing Extends the lifetime of a liner Shifting sealing ring to a new working position

    CATEGORIES:

    • Stern Tube Seals

    • Stern Tube Liner (Bearings)

    CLASS APPROVED:

    IACS: CCS, KR, DNV

  • China TL Marine Stern Tube Seals Service logo

    Year Founded: 2022

    Vessel spare parts if you need, please feel free to contact us. email: sales@tlmarines.com service@tlmarines.com

    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

  • Arctic Ship Repair logo

    Year Founded: 2024

    Arctic Ship Repair ensures fast, reliable supply of genuine and OEM marine spare parts worldwide. From critical engine components to deck, electrical, and safety equipment, we source and deliver with precision. Our global network and technical expertise allow us to match exact specifications, ensuring compatibility and class compliance. Whether for planned maintenance or urgent repairs, we minimize downtime with prompt logistics and transparent tracking. Arctic Ship Repairyour trusted partner for dependable spare parts, delivered on time and ready to perform.

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    • Stern Tube Seals

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    • Compass (Gyro & Magnetic)

      (91)

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    • Turkey

  • international marine office logo

    Year Founded: 2014

    Welcome to International Marine Office IMO The Integrated Partner for Maritime Offshore Excellence Welcome to International Marine Office IMO, your comprehensive strategic partner providing full-spectrum solutions across the entire maritime and offshore lifecycle. We are a globally recognized force in engineering, construction, and operational support, committed to driving efficiency and sustainability for our clients. International Marine Office IMO, a powerhouse in the global maritime sector, specializing in delivering comprehensive solutions from design to delivery and throughout the operational lifecycle of your vessel. For over than 20 years experience, IMO has been the trusted name for clients demanding reliability, innovation, and integrated service excellence. Our expertise is built upon a foundation of deep technical knowledge across all phases of the marine industry:

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    • 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

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    • Alpha Lubrication Systems

    • Anemometers

      (168)

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