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- QPM - Cutless Propeller Shaft Bearings
QPM - Cutless Propeller Shaft Bearings
Water lubricated cutless shaft bearings are the tried and tested standard bearing for small pleasure boats with inboard motor up to larger workboats, tugs, ferry boats and offshore supply boats with medium to larger shaft sizes.
- Lubrication: Water
- Material: Naval Brass or Non Metallic with Nitrile Rubber Lining
- Placement: Forward Stern Tube, Aft Stern Tube, Strut and Rudder Shaft
- Size: from 3/4 to 15 inches shaft diameter (mm sizes available)
- Styles: Flanged, Non Flanged, Fully Split
- Advantage: Low Cost, No Oil Dumping Hazard
- Disadvantage: Costly for the Larger Shaft Diameters
These bearings are made with naval brass shell for shaft up to 15 inch diameter. In addition to naval brass, the smaller non flanged types (up to 6 inch) come in a non metallic material for installation in aluminum boats thus avoiding dissimilar metals issues. The smaller non flanged sizes (up to 6 inch) also come in metric sizes.
These bearings are made to be press fit into the housing but other installation methods can be used.
The bearing interior is lined with nitrile rubber and V grooves are machined into the rubber to increase the water flow inside the bearing.
These bearings are for water lubricated stern tube systems that are not in danger of dumping oil into marine waterways.
During retrofit the costly naval brass shell can be relined with new nitrile rubber if time permits. This option is advantageous only for bearings of larger shaft diameters. This option is not available if the housing has been damaged or is out of round tolerance.