Stern Tube Bearings

Hat-Rapids-LG-in-horizontal-boring-machine

Making history for 165 years in the fastest, most powerful ships and submarines in maritime history while eliminating current EPA compliance issues.

Lignum Vitae Water Lubricated bearings commonly replace composite, plastic, bronze, babbitt and oil filmed bearings. The material is the oldest bearing in service with unmatched longevity in water applications. It has tremendous load bearing qualities and unique shock absorbing qualities that no other material can match.  This material has successfully returned to the Hydro Power market and now will return to the Marine market.
Benefits of the Material as a Stern Tube Bearing9 Marine Stern Tube Water Lubricated Bearings

 

 

Self lubricating

Zero Tolerance (We can touch the shaft)

High shock load

100% bearing material

Low maintenance

Low friction

Run of the river or salt water applications

High edge load

Easy to machine

Non conducting

Easy installation

Custom made to your specifications

 

The U.S. Environmental Protection Agency (EPA) has recently mandated the type of lubrication oil commercial vessels are permitted to use. According to the EPA, up to 16 million gallons of lubricants are discharged into waterways annually  —predominately from stern tube leaks – equating to 1.5 times the size of the Exxon Valdez spill.

Lignmum-Vitae Bearings are Water Lubricated – Eliminates EPA Issues

A Brief History from: United States Naval Institute proceedings, Volume 45 P. 1929

Lignum-vitae, The Vital Wood.—The propeller shaft of every battleship, every destroyer, every transport, in fact, every large steamship, revolves in a wooden bearing at the stern end. Of all the thousands of woods in the world, true lignum-vitae, is the only one that has been found equal to this exacting service. The peculiar properties which so well fit lignum-vitae for the purpose are due to the arrangement of the fibers and the resin content of the sap cells. The fibers never run straight up and down the log, but weave back and forth in a serpentine manner that cross and crisscross like the corded fabric of an automobile tire. The result is a material of extreme tenacity and toughness. When the sap cells cease to function, their every nook and cranny become filled with resin which is about a third heavier than water. The result is a material which weights about 80 pounds per cubic foot.

—Engineering World, Oct. 1, 1919.