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Distance Rings and Spacer Rings for Stern Tube Suppliers

Distance rings and spacer rings are small but critical components inside the stern tube assembly. They set bearing clearances, position oil seals, and absorb axial movement of the propeller shaft.

Worn or undersized rings cause oil leaks, vibration, and bearing damage. Replacement parts must match the original drawings exactly, or the seal arrangement will not hold under load.

RecordsMarine maintains a directory of distance rings and spacer rings for stern tube suppliers, helping shipowners, dry dock teams, and chief engineers source parts that fit the first time.

What These Rings Do

Each ring in the stern tube assembly has a specific job:

  • Distance rings — set axial spacing between seal faces
  • Spacer rings — fill the gap between bearings and shaft components
  • Wear rings — protect the shaft surface from seal contact
  • Locking rings — hold the assembly in place under torque

Sizes range from a few centimeters on small vessels to over a meter on VLCC and bulk carrier shafts. Material is usually bronze, stainless steel, or high-grade composite, depending on the seal maker and shaft size. Approved suppliers of distance rings and spacer rings for stern tube assemblies hold drawings and CAD files for the most common makes, which shortens lead time on emergency orders.

When These Parts Are Needed

Common reasons for ordering ring replacements:

  • Scheduled tail shaft survey during dry dock
  • Oil leak at the forward or aft seal
  • Bearing replacement or relining
  • Shaft withdrawal for propeller work
  • Damage after grounding or contact
  • Conversion to environmentally acceptable lubricant (EAL) systems
  • Newbuild commissioning or shaft alignment

Most owners keep at least one full ring set per vessel as the ship's spares. Working with proven distributors of distance rings and spacer rings for stern tube assemblies also makes restocking easier between dry docks.

Recommended Brands

The stern tube seal market is led by a small group of OEMs that also supply ring sets:

  • Wärtsilä (Sealol, Simplex-Compact)
  • Kemel
  • Cedervall
  • Eagle Industry (formerly Blohm + Voss)
  • John Crane Marine
  • Deep Sea Seals

Rings matched to the original seal maker stay traceable during the tail shaft survey and protect the OEM warranty. Aftermarket sources exist for older shaft designs no longer in production.

What to Check Before Ordering

Useful points to confirm before placing an order:

  • Original drawing number or part number
  • Shaft diameter and seal model
  • Material specification — bronze, steel, or composite
  • Surface finish and tolerance class
  • Material certificate (3.1 or 3.2 EN 10204)
  • Lead time fitting the dry dock window
  • Quantity and packaging for shipboard storage

A photo of the existing ring with measurements often speeds up the quote, especially for older shafts where drawings are missing.

Industry Standards

Stern tube ring supply follows IACS UR M5 on shaft surveys, ISO 9001 quality systems, EN 10204 material certification levels, and class society rules from DNV, ABS, Lloyd's Register, and others. Environmentally acceptable lubricant (EAL) rings used in US VGP waters must also meet EPA 2013 VGP requirements for material compatibility.

Frequently Asked Questions

How long do stern tube rings last?

Most run for 15 to 20 years, matching the seal overhaul interval.

Are rings shaft-specific or interchangeable?

Shaft-specific. Each set is machined to the original drawing tolerance.

What is the typical lead time?

Common sizes ship in 1 to 3 weeks. Custom rings for older shafts can take 6 to 10 weeks.

Can rings be re-machined instead of replaced?

Sometimes, if the wear is minor and the material is suitable. Most owners replace rather than re-machine for class compliance reasons.

Do rings ship with material certificates?

Yes. EN 10204 type 3.1 is standard, with 3.2 available for safety-critical applications.

Find Distance and Spacer Rings Supplier Near You

Below is a vetted list of suppliers stocking stern tube rings at major shaft repair workshops and dry dock hubs. Pick from the entries to match your shaft model, ring material, and order timing.

  • Pu Tian Xiu Yu Marine supplier logo

    Year Founded: 2022

    Verified

    Pu Tian Xiu Yu Marine supplier

    Verified

    all spare parts can contact us we offer you all kinds of marine brand new or second hands spare parts

    417019514@qq.com

    CATEGORIES:

    • Distance Rings & Spacer Rings for Stern Tube

    • AIS (Automatic Identification Systems)

    • ARPA (Automatic Radar Plotting Aids)

    • AMS (Alarm Monitoring Systems)

    • Air Reservoirs

      (5)

    BRAND:

    • Ulstein

    • SCHOTTEL

    • CHG

    • CJR Propulsion

    • Dalian

      (68)

    CLASS APPROVED:

    IACS: ABS, ClassNK, CCS, BV

    WAREHOUSES:

    • China

  • SEASTAR (HK) TRADE LIMITED logo

    Year Founded: 2018

    Verified
    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

    CATEGORIES:

    • Distance Rings & Spacer Rings for Stern Tube

    • 15 PPM Monitoring Equipment

    • AIS (Automatic Identification Systems)

    • AMS (Alarm Monitoring Systems)

    • ARPA (Automatic Radar Plotting Aids)

      (195)

    BRAND:

    • Ulstein

    • SCHOTTEL

    • CHG

    • CJR Propulsion

    • Dalian

      (68)

    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

    CATEGORIES:

    • Distance Rings & Spacer Rings for Stern Tube

    • 15 PPM Monitoring Equipment

    • AIS (Automatic Identification Systems)

    • AMS (Alarm Monitoring Systems)

    • ARPA (Automatic Radar Plotting Aids)

      (177)

    BRAND:

    • Ulstein

    • SCHOTTEL

    • CHG

    • CJR Propulsion

    • Dalian

      (68)

    CLASS APPROVED:

    IACS: DNV

    WAREHOUSES:

    • 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.

    CATEGORIES:

    • Distance Rings & Spacer Rings for Stern Tube

    • 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

  • 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

    CATEGORIES:

    • Distance Rings & Spacer Rings for Stern Tube

    • 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

  • 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

    CATEGORIES:

    • Distance Rings & Spacer Rings for Stern Tube

    • 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

    • Engine Fuel Injection High Pressure Pipes (2-Strok

    • Engine Exhaust Valve L.O. High Pressure Pipes (2-S

      (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

    CATEGORIES:

    • Distance Rings & Spacer Rings for Stern Tube

    • 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

  • Kay Oceans logo

    Year Founded: 2025

    Kay Oceans is a trusted marine procurement partner, providing reliable sourcing solutions for vessels worldwide.

    CATEGORIES:

    • Distance Rings & Spacer Rings for Stern Tube

    • Automation Control Equipment & Control Units

    • Boiler Automation Equipment

    • Compass (Gyro & Magnetic)

    • Diesel Generators

    • Cranes

    • CPP Systems (Controllable Pitch Propeller)

    • ECDIS (Electronic Chart Display Information System

    • Electric Propulsion Systems

    • Electrical Actuators

    WAREHOUSES:

    • India

    • Greece

    • Singapore

  • 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.

    CATEGORIES:

    • Distance Rings & Spacer Rings for Stern Tube

    • 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

  • 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:

    CATEGORIES:

    • Distance Rings & Spacer Rings for Stern Tube

    • 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

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