COMPAC Open Seawater Lubricated
Propeller Shaft System

Charting a New Course to Eliminate Ship Propulsion Pollution
Below the Waterline Forever

The COMPAC Open Seawater Lubricated Propeller Shaft Bearing System eliminates oil and grease discharges while delivering the lowest operating costs for ship owners. Oil systems can be expensive to maintain, especially when utilizing an EAL. With an open Thordon system, there is zero environmental impact and the headaches that come with oil leakage can be avoided completely, and seawater is free!  A COMPAC system guarantees compliance to the everchanging environmental regulations in the shipping industry.

Not only is the COMPAC system the environmentally responsible choice, it is proven to last! We have over 550 ocean-going tankers, bulkers, dry cargo, ferry, cruise and container ships equipped with COMPAC seawater lubricated propeller shaft bearings. 

What are you leaving in your wake?

“Having water-lubricated stern tube bearings not only improves a company’s environmental credentials but also eliminates the costs associated with maintaining an oil system and associated equipment.”

– Enio Stein, CFO
Log-In Logística (Brazil)







Did you know that seawater is a free lubricant for your sterntube? The use of seawater lubrication dates back to 1843 and with robust modern polymer bearing technology seawater lubricated systems are less complicated and time consuming than oil lubricated shaft systems. With zero pollution risk you won’t have to worry about criminal penalties or fines from illegal oil leaks.

Propeller Shaft Bearing

propeller shaft compaq


Thordon COMPAC is a high performance water lubricated bearing system primarily for “blue water” operating conditions. Specially formulated with a low coefficient of friction to reduce startup friction and eliminate stick-slip,

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COMPAC bearings SQ

COMPAC bearings with key
slots for fixed key

COMPAC installed Dec 2017 sq

Thordon COMPAC bearings

citadel ferussmit with compac sq

COMPAC bearings fitted to
Citadel Ferussmit

Shaft Coating



ThorShield Anti-Corrosion Shaft Coating


Thordon's ThorShield propeller shaft coating system provides corrosion protection against seawater. This toughened, 2-part epoxy coating is up to nine times more flexible than existing shaft coating products.

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Water Quality Package





Thordon Water Quality Package is designed to supply seawater to the propeller shaft bearings for lubrication and cooling while condition the seawater by removing suspended solids.

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Shaft Seals



Seal installed on Hudson low res (crop)


The Thordon SeaThigor Seal is a mechanical face seal for 300mm (11.8") to 750mm (29.5") water lubricated propeller shafts found in yachts, cruise ships, merchant ships and naval vessels. The SeaThigor has evolved from a design first tested in 2003 and improved during the next decade.

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Bearing Condition Monitoring System

Bearing Condition Monitoring (BCMv2)


The Thordon Bearing Condition Monitoring (BCMv2) system supports the Classification Societies’ requirements for condition monitoring of marine vessel bearing wear inspection. The Thordon BCMv2 system provides a one-touch, remote indication of current bearing clearance. The measurement is displayed on the control panel located in the vessel.

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Technical Papers


Class Society Requirements For Extended Shaft Withdrawals



The final (fully finished) sizing of a Thordon elastomer or ThorPlas bearing can be determined by using the Thordon Bearing Sizing Calculation Program.

You cannot run the Thordon Bearing Sizing Calculation Program without a User Registration Number. Once you have a User Registration Number you can download the Program below and enter it when prompted.

Click here to Request a Bearing Sizing Program User Registration Number

If you have a Bearing Sizing Program User Registration Number, you can download the program here


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Our Newsletter

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  • News Thumbnails 320x160_NW23-MF

    Thordon Merchant Fleet NewsWorks 2023

    Thordon’s web-based newsletter specifically developed for marine users of oil-free and grease-free bearings in the merchant marine sector. This newsletter includes articles that highlight our successes on tankers, bulk cargo carriers, ferries, and cruise ships with COMPAC seawater-lubricated propeller shaft bearings, and ThorPlas-Blue deck equipment installed and used around the world. We also introduce Thordon’s new BlueWater Seal and highlight the largest rudder bearing Thordon has ever produced.
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Recent Marine News

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  • Orkim Sapphire fitted with COMPAC

    Orkim Takes to the Water with Five Product Tankers Fitted with COMPAC

    Jul 12, 2021
    China’s Fujian Southeast Shipyard has delivered four in a series of five new product tankers ordered by Malaysia’s Orkim Sdn Bhd. The 9000dwt Orkim Sapphire and Orkim Pearl, and 14,500dwt Orkim Diamond and Orkim Emerald represent the first vessels in the ship operator’s fleet to be fitted with a COMPAC seawater lubricated shafting system from Thordon Bearings.
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  • COSCO Vessel fitted with COMPAC bearings

    COSCO Confirms Thordon Seawater Lubrication for Eight Newbuild General Cargo Ships

    Jun 15, 2021
    COSCO Shipping Specialized Carriers, a subsidiary of China Ocean Shipping Group (COSCO), COSCO Shipping Lines, has confirmed that the eight newbuild multipurpose cargo vessels entrusted to COSCO Shipping Heavy Industry (Dalian) Co. Ltd. will each feature a COMPAC seawater lubricated shaftline arrangement from Thordon Bearings. The scope of supply, to be rolled out in two four-ship batches scheduled for August 2021 and December 2022, includes COMPAC propeller shaft bearings, shaft liners, ThorShield shaft coating, and Thordon’s Water Quality Package.
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