ISB Series Intermediate Propeller Shaft Bearing

Longer propeller shafts necessitate increased bearing support, as indicated by the propeller shaft bearing spacing calculator. The intermediate shaft bearings serve to bridge the gap when a conventional bronze stern bearing and forward shaft bearing are insufficient.

R.E. Thomas' intermediate shaft bearings can also serve as replacements for traditional stuffing boxes when paired with a dripless shaft seal. In this scenario, the cast bronze finish is machined with barbs to facilitate a proper connection to the self-aligning shaft seal. This is the same bearing utilized in the widely recognized ISB-SA Combo shaft sealing system.

Each of the water-lubricated shaft bearings is precision machined from cast bronze and incorporates Duramax (Johnson) Cutless© bearings.

While the diameter of the shaft is crucial to ensure the propeller's strength to prevent breakage or permanent bending, the shaft bearing is vital to mitigate excessive vibration and shaft whip.

Available in shaft diameter sizes from 1″ to 4″.

Upgrade a Traditional Stuffing Box to a Dripless Shaft Seal:
The intermediate shaft bearings can also be used to replace traditional stuffing boxes when combined with a dripless shaft seal. In this case, the cast bronze finish is machined with barbs to help mate up to the self-aligning shaft seal. This is the same bearing used in our popular ISB-SA Combo shaft sealing system.