Up for sale is a genuine Duramax Marine Johnson Cutless metric water-lubricated sleeve bearing. As the industry standard for commercial, government, and pleasure-craft propulsion hardware, Duramax engineered this premium bearing with a seamless, centrifugally cast naval brass outer shell. Internally, it features a permanently vulcanized, proprietary nitrile rubber lining that resists deterioration from oils, greases, and standard dock chemicals. Utilizing advanced hydrodynamic water-wedge engineering principles, this metric unit uses radially-spaced flush channels to maintain a continuous, low-friction fluid film. This protective boundary isolates machinery vibration, eliminates shaft whip, and sweeps abrasive grit out of the strut or stern tube area to preserve the lifetime of your propeller shaft.

Key Features

Genuine Made in USA: Authentic Duramax Marine original equipment manufacture built to rigorous U.S. Navy Buships clearance and commercial maritime standards.
Hydrodynamic Pocket Lining: Features an optimized internal rubber compound that creates a frictionless water boundary layer during rotational break-in.
Precision Polish Exterior: External seamless naval brass housing is expertly machined and polished to simplify press-fitting into strut barrels or stern tube mounts.
Abrasive Grit Rejection: Alternating full-length radius-rounded grooves depress sand particles away from the journal path and flush them harmlessly through the assembly.

Technical Specifications

Brand: Johnson Cutless by Duramax Marine LLC
Manufacturer Part Number (MPN): 870404100
Production Serial / Batch Number: 153367-000
Shell Material: Seamless Machined Naval Brass / Metallic
Liner Core Material: Specially Formulated Oil-Resistant Nitrile Rubber
Shaft Size / Inner Diameter (I.D.): 40 mm
Outside Diameter (O.D.): 55 mm
Overall Bearing Length: 160 mm
Metal Shell Thickness: 3.07 mm
Approximate Unit Weight: 1.8 lbs / 0.8 kg

Installation & Care Warnings

Press Fit Guidelines: These metallic sleeve bearings are standardly installed using a light press-fit into the strut housing or stern tube and mechanically locked down via standard cone-pointed set screws.
Chilling Precautions: If your specific installation geometry requires shrink-fitting, the bearing housing must be chilled using regular ice or a controlled freezer environment down to a gradual temperature threshold. Do NOT use dry ice, and avoid any heavy pounding or shocking while frozen, as doing so can permanently compromise the internal rubber-to-metal vulcanized bond.

Please cross-examine your boat's metric propulsion blueprints or your existing pulled strut bearing shell parameters to confirm an exact 40x55x160mm match before purchasing. Feel free to send a message if you have any questions!