Quality Pacific Manufacturing, Inc. products

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.

Fully split roller bearings are the standard method for supporting the propeller line shaft inside the vessel for small to mid shaft diameters.  They are installed to support longer propeller shaft between the gearbox and the stern tube. 

The various types of composite marine bearing have become popular with larger shaft applications.  Pacific Marine`s bearing is water lubricated in marine applications but can also be grease lubricated or run dry in some non marine applications.

Demountable stave bearings are water lubricated cutless bearings without the costly outer naval brass shell.  The housing for the demountable stave is built into the vessels and is part of the vessel structure.  This makes initial cost high but replacement cost low as you are replacing the rubber bearing material only and not replacing the costly brass outer shell.  This bearing system becomes more economical with larger sizes shaft diameters.

 This is a traditional bearing for larger shaft diameters when stern tube systems were oil lubricated and before composite bearings were developed. With environmental policy that included large fines for dumping hydrocarbon oil into waterways, these bearings quickly became out of favor.  With the advent of environmentally friendly oils, these bearings may return to more routine use. 

This type bearing is a common bearing type for large shaft applications due to the cost being much less than a split roller bearing of similar size. For smaller shaft sizes this bearing is equivalent in cost to a split roller bearing. This type bearing is oil lubricated with slinger ring and can also have a water cooling system to remove unwanted heat. This bearing is self aligning and is designed to support long propeller shafts inside the vessel between the gearbox and stern tube.  

Nitrile rubber bushings are a rudder shaft bearing material that can withstand the high impact in rudder applications. They include water lubrication grooves inside but are otherwise shipped unmachined. They can be machined upon request. These bearings are installed with set screws and are not press fit like a cutless bearing.

DX Rudder Bushings are molded from a 70 Scale D, Durometer, Nitrile Rubber Compound, formulated to withstand the rugged “impact” service encountered in ship’s rudder steering systems. They possess high rigidity for maximum dimensional stability while still retaining a degree of resiliency required to dampen peak shock loads.

Custom Sizes and Machining Service Available. CUSTOM Shell Materials and CUSTOM Liners Available: Naval Brass, Bronze, Stainless Steel, Carbon Steel, Aluminum Shells. Below Codes Refer to Naval Brass with Nitrile Rubber Lining with Lubrication Grooves.

ALDA - 3/4" Shaft x 1-1/4" OD x 3" Long - Non Metallic - Propeller or Pump - Cutless Bearings - Cutlass Bearing. Non Metallic Bearing. External non metallic shells are machined and polished to provide easy fitting. Specially formulated oil and chemical resistant nitrile rubber is securely bonded to the shell. Units with thin shells are available for the struts of small craft. Sleeve bearings are usually installed by light press fitting and locked in place with cone pointed set screws.