The Johnson Duramax Marine Cutless Bearing DUR-870252104, also known as the \"BASE\" model, is a water-lubricated sleeve bearing designed for marine propulsion systems. It features a tough nitrile rubber lining bonded to a naval brass outer shell and is used to support propeller shafts in various vessel applications.
Key specifications
Part number: DUR-870252104
Common name: \"BASE\" cutless bearing
Dimensions:
Shaft diameter (ID): 1 inch
Outside diameter (OD): 2 inches
Length: 4 inches
Metal thickness: 1/8 inch
Weight: Approximately 1.3 pounds
Materials: Naval brass outer shell with a nitrile rubber lining.
Core features
Water-lubricated design: The bearing uses water, an abundant and non-polluting lubricant, to create a hydrodynamic film between the propeller shaft and the nitrile rubber lining. This reduces friction and prevents heat buildup.
Grooved liner: The rubber lining features longitudinal grooves that allow water to flow freely. This flushing action helps to remove abrasive particles, such as sand and silt, protecting the shaft from scoring and extending its life.
Vibration dampening: The inherent elastic properties of the rubber lining absorb vibrations from the propeller shaft, contributing to a smoother and quieter operation.
Durable and resistant: The nitrile rubber is specially formulated to be resistant to oils, chemicals, and wear, ensuring a long service life in demanding marine conditions.
Versatile application: The design is suitable for use in both strut mounts and stern tubes. It can also function as a rudder-stock or pintle bushing.
Easy installation: The polished naval brass shell is precisely machined for a light press-fit installation. The bearing is often secured with cone-pointed set screws.
Usage and benefits
This durable, water-lubricated bearing is trusted by many marine professionals and is designed to deliver unmatched performance and long life. It is the preferred choice for reliable operation in challenging, abrasive underwater environments.
