COLLAR SHAFT 70mm.

Function and technical context

The 70 mm shaft collar is a component of the transmission and sealing system of shaft-powered boats, whose mission is to fix, center and retain the tail shaft in its correct position, avoiding unwanted axial displacements. It works in the exit area of ​​the shaft through the hull or the horn, working closely with the stuffing box, the horn bearings and the coupling to the motor. Its integrity is essential to guarantee the alignment of the shaft with the propeller: a damaged collar or one with excessive play directly compromises this alignment, generating vibrations, accelerated wear on the bearings and possible damage to the sealing seal that protects the interior of the hull against the ingress of water.

When to replace this part?

The most common symptoms that indicate that the shaft collar needs inspection or replacement are: abnormal vibrations transmitted to the hull during navigation, metallic noises or knocking in the horn area, noticeable play when moving the shaft manually, and visible wear on the contact surface or retaining lips. It is recommended to inspect this element at each docking or seasonal maintenance, since continuous exposure to salt water, corrosion and torque accelerates its deterioration. Replacing the collar preventively when any looseness is detected avoids major breakdowns in the transmission system and costly repairs in dry dock or, in the worst case, emergency situations at sea.

Compatibility table