Osculati Brass Rubber Water Lubricated Propeller Shaft Cutless Bearings – Mixed Metric/Imperial Sizes

Osculati Brass Rubber Water Lubricated Propeller Shaft Cutless Bearings Ø20–90 mm

Osculati Brass Rubber Water Lubricated Propeller Shaft Cutless Bearings are designed for supporting and guiding rotating propeller shafts in marine propulsion installations. The bearings combine a brass external housing with a hydro-lubricating rubber inner lining.

The range includes 20 dimensional configurations for metric propeller shafts from 20 to 90 mm in diameter, with external bearing diameters from 1 1/4" to 4 1/2" and overall lengths from 76.2 to 355.6 mm.

Brass External Housing

Each bearing features a cylindrical brass external frame that forms the supporting structure for installation in the corresponding stern tube assembly.

The brass housing surrounds the internal rubber bearing lining and provides the external mounting surface.

Hydro-Lubricating Rubber Lining

The internal bearing surface is manufactured from hydro-lubricating rubber, designed to support the rotating propeller shaft in a water-lubricated marine shaft system.

Water lubrication supports shaft rotation and helps reduce friction and wear between the shaft and bearing surface.

Marine Propeller Shaft Support

These cutless bearings are intended for installation in marine stern tubes and shaft support assemblies.

The bearing provides guidance and support for the rotating propeller shaft within the propulsion system.

Metric Shaft Diameters and Imperial External Diameters

The Osculati bearing range combines metric internal shaft diameters with external bearing diameters specified in both inches and millimetres.

The available shaft diameters range from 20 to 90 mm. The external bearing diameters range from 1 1/4" to 4 1/2".

Bearing Dimensions

The manufacturer's dimensional drawing identifies three measurements:

• Ø A – Shaft Diameter: Internal bearing diameter corresponding to the propeller shaft.
• Ø B – External Diameter: Outside diameter of the brass bearing housing.
• C – Length: Overall bearing length.

Available Models and Dimensions

The following table lists all 20 configurations according to the Osculati technical catalogue.

Available Shaft Diameters

The bearing range covers the following metric propeller shaft diameters:

• 20, 22, 25, 28 and 30 mm.
• 32, 35, 38, 40 and 45 mm.
• 50, 55, 60, 65 and 70 mm.
• 75, 80, 85 and 90 mm.

Alternative Bearing Dimensions

For 25 mm propeller shafts, two configurations are available with different external bearing diameters:

• Osculati 52.307.25: Shaft Ø25 mm, external diameter 1 1/2", length 101.6 mm.
• Osculati 52.307.26: Shaft Ø25 mm, external diameter 1 1/4", length 101.6 mm.

This allows selection of the corresponding bearing outside diameter for the existing stern tube installation.

Key Features

• Brand: Osculati.
• Product Type: Marine Propeller Shaft Cutless Bearing.
• External Housing: Brass.
• Internal Bearing Material: Hydro-Lubricating Rubber.
• Lubrication: Water.
• Shaft Diameter Range: 20–90 mm.
• External Diameter Range: 1 1/4"–4 1/2".
• Overall Length Range: 76.2–355.6 mm.
• Available Configurations: 20.

Technical Specifications

Bearing Size Selection

Select the appropriate Osculati shaft bearing using three dimensions:

• Shaft (A): Internal bearing diameter corresponding to the propeller shaft, in millimetres.
• Shaft Tube (B): External bearing diameter, specified in inches.
• Length (C): Overall bearing length, in millimetres.

Check all three dimensions against the existing propeller shaft and stern tube installation before selecting the required bearing.