Propeller Shaft Bearing Systems

Propeller Shaft Bearings

Shaft Coating

Water Quality Package

COMPAC

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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SXL

Thordon SXL offers a lower coefficient of friction for reduced break-away torque and smoother operation at lower shaft RPM, increased resistance to third particle abrasive wear and improved wear life compared to XL.

ThorShield

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

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

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Shaft Seals

TG100

The Thordon TG100 is a new mechanical seal designed specifically for 86mm (3.375") to 305mm (12") shaft vessels operating in either clean or abrasive-laden waters including workboats, harbor tugs, offshore supply vessels, yachts, ferries, fishing trawlers and self-propelled dredgers.

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SeaThigor

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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Documents

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Commercial Ship AFT Seal Oil Discharges PDF, 909.34 KB Factual Accounts of Oil Leaking from Propeller Shaft Stern Tubes Due to AFT Seal Damage.
Oil Emissions from Propulsion Systems of Commercial Ships PDF, 322.29 KB
COMPAC System Brochure for Merchant Fleet Vessels PDF, 873.63 KB
BlueWater Seal Brochure PDF, 385.19 KB
Large Yacht Application Brochure PDF, 4.69 MB

Technical Papers

Seawater for Propeller Shaft Lubrication in Merchant Ships PDF, 980.89 KB This paper by Craig Carter looks at the growing uptake of open seawater lubricated propeller shaft systems considering environmental, operational, regulatory and shipbuilding issues

References

ThorPlas-Blue - Hydraulic Swim Platform PDF, 314.29 KB
Commercial Ship References PDF, 1.14 MB Shipowners using Thordon Seawater Lubricated Propeller Shaft Bearings
Water-lubricated Shaft Reliability Proven in Cruising PDF, 484.29 KB
Largest Sloop Ever Uses Thordon PDF, 123.01 KB
Thordon Helping To Catch Marlins in Sportfishing Yachts PDF, 147.07 KB

Design

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

Videos

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Since 1965 Thordon has been providing water lubricated systems, this video examines the different components in the COMPAC Seawater Lubricated Propeller Shaft Bearing System and how they operate.

How a Thordon COMPAC stern tube bearing system works

Thordon water quality package provides a clean flow of lubricating seawater to the propeller shaft bearings. It takes only the seawater from the sea (through the sea chest), removes abrasive particles and pumps the water into the stern tube to lubricate the non-metallic bearings.

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Our Newsletter

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Read our most recent newsletter

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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Ever-Lasting Bearings Keep World's Largest Sloop Ever-Ready for Charter

Oct 03, 2018

One of the projects Canada’s Thordon Bearings is most proud to be associated with is that of the Mirabella V, which has been operating the company’s SXL and COMPAC bearings continually for more than 15 years.
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Biodegradable EALs Under the Spotlight As More Sterntube Bearings Fail

Jan 24, 2018

Thordon Bearings has welcomed an industry initiative to evaluate the effect of biodegradable lubricants on sterntube bearings following a reported marked increase in sealed oil lubricated propeller shaft bearing failures.
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