Boat bearing SBRG1.00X1.25X20

for propeller shafts

Marine Hardware™, Inc. supplies water-lubricated brass-shelled rubber bearings with all our struts and has all bearing sizes listed below available for your replacement needs during regular maintenance of vessels. STRUTS/ RUDDERS A good strut bearing reduces friction, dampens slight vibrations and misalignment, and flushes contaminants through the bearing to avoid abrasion that will mar the shaft surface. These functions are accomplished by having the bearing slightly oversized on the inside diameter, so that a thin film of water rides between the rubber surface and the stainless shaft. The grooved contour of the rubber surface is critical to the flow and circulation of water around the shaft. A bearing worn by normal usage should be replaced during service to maintain that high level of mechanical performance. Poor water lubrication in the bearing (usually caused by shaft misalignment or too tight a fit with the shaft) manifests itself in excessive bearing wear, transmission of shaft whip throughout the boat, and marring of the shaft surface. When installing the strut bearing, it is important to have a light press f it between it and the bored casting, and to secure it mechanically with cup point stainless steel set screws. Be sure, however, not to collapse the bearing shell when installing the set screws, as it may then bind against the shaft. Bearings with fiberglass outer shells are highly recommended for struts made of stainless steel, as they preclude the problem of dissimilar metals which would occur with a typical brass-shelled bearing. Fiberglass- shelled bearings with the same dimensions as listed below are available from Marine Hardware™, Inc. by special order