Any rudder shaft has a certain degree of deflection under load. In many cases this shaft deflection will carry highly concentrated loads if the bearings are not self-aligning.
In the case of smooth bearings (without rollers), the friction generated can even, in extreme cases, lead to the rudder locking.
Jefa self-aligning roller bearings solve the problem and ensure optimum tiller smoothness and sensitivity in all situations, thus allowing for the use of a less gear-intensive steering system.
They also greatly simplify the work on site, as there is a greater tolerance for alignment, as well as a certain elasticity in the hull-coverage union.
Jefa bearings are machined from solid EN6082 aluminum, black anodized to thickness. The hemispherical articulation is made of Delrin, as are the self-contained rollers.
All diameters are available, from millimetre to millimetre. This allows, for example, to use a 89mm bearing for a turned axis from a rough 90mm bar.
SELF-ALIGNING UPPER BEARINGS
Upper bearing type 5T000
Upper bearing type 5T000Z with screw cap for emergency bar – Angle variable from 0° to 20°:
Upper bearing type 4SF000H with integrated thrust bearing:
Upper bearing type 4S000Z with screw cap and integrated thrust bearing:
STANDARD UPPER BEARINGS
Upper bearing type 42000:
Upper bearing type 42000Z with screw cap and integrated thrust bearing:
STANDARD LOWER BEARINGS
Lower bearing type 41000:
SELF-ALIGNING LOWER BEARINGS
Lower bearing type 4S000 with watertight ball, which can be completed with lip seals:
Lower high-load bearing type 43000, which can be welded to aluminium hulls:
Bottom tapered bearing type 5BT000 for mounting on moulded print:
Self-aligning composite lower bearing type 6T000:
The 6T000 series of bearings combines ease of installation with particularly smooth operation in all circumstances, as the bearing is always aligned with the rudder shaft. The bearing is made of PETP (also known as Arnite, Ertalyte, Sustodur & Ultradur) inserted into a GRP tube. This allows direct lamination in the hull. For further information please refer to the installation guide on our website.
Lower composite bearing type 61000 and 61000S:
The series of bearings type 61000 and 61000S combines the great ease of installation with a particularly smooth operation in all circumstances.
The bearing is made of PETP (also known as Arnite, Ertalyte, Sustodur & Ultradur) inserted inside a GRP tube, which allows direct lamination in the hull. For further information please refer to the installation guide on our website.
Double self-aligning composite bearing type 6D000:
Double composite bearing type 6S000:
Lower bearing on self-aligning PETP rollers type 6BB:
Upper roller bearing self-aligning PETP type 6BF: