PART NO. |
RUDDER SHAFT dia. "d" |
TUBE dia. "D" |
HEIGHT "H" *1 |
WEIGHT |
WORKING |
6T030 - 6T045 |
30 to 45 mm |
90 mm |
max. 1000 mm |
1.7 kg |
1300-1800 kg |
6T046 - 6T060 |
46 to 60 mm |
110 mm |
max. 1000 mm |
2.1 kg |
2500-3200 kg |
6T061 - 6T072 |
61 to 72 mm |
130 mm |
max. 1000 mm |
2.8 kg |
4200-4800 kg |
6T073 - 6T095 |
73 to 95 mm |
150 mm |
max. 1000 mm |
3.3 kg |
4900-6200 kg |
6T096 - 6T125 |
96 to 125 mm |
180 mm |
max. 1000 mm |
4.3 kg |
6300-8000 kg |
6T126 - 6T162 |
126 to 162 mm |
210 mm |
max. 1000 mm |
5.1 kg |
8100-10100 kg |
6T163 - 6T210 |
163 to 210 mm |
260 mm |
max. 1000 mm |
7.5 kg |
9900-11500 kg |
6T specification form: |
The applications for the 6T series bearing: |
The 6T series bearings combine a very simple installation with a very smooth operation under all circumstances as the bearing will always be aligned to the rudder shaft. The bearing is made of PETP (also known as Arnite, Ertalyte, Sustodur & Ultradur) in a GRP tube, allowing it to be laminated directly into the hull. A separate rudder tube is not required as the bearing housing is designed to extend above the boats waterline. It must be sealed to the rudder shaft with a gaiter. In the case of female moulded production boats the bearings housing can be mounted into the hull mould before lamination and gel coating begins. After gel coating the hull is laminated as usual with the exception that the hull laminate runs up the side of the bearing housing. This means that the bearing is already installed in the hull upon de-moulding, thus providing an integrated rudder support, and saving production time. It's advisable to add some webs around the bearing to allow the rudder forces to be spread on the hull. As the bearing is self-aligning, there will be no torque transmitted to the hull, just rudder forces and the bearing will never try to twist out of the hull. The bearing ball can be easily dismounted out of the housing for installation safety or replacement when any damage in the future may happen. |
Installation of JEFA Marine composite bearings in female moulded hulls:
Please remember that these guidelines represent good practice, however all structural components of a sailing vessel should be engineered by a qualified engineer for the actual case. JEFA MARINE takes no responsibility for any structural failures which might result from the use of these guidelines.
Installing the 6T bearing is a ready made hull: |
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Installation of JEFA Marine composite bearings in ready made hulls:
Please remember that these guidelines represent good practice, however all structural components of a sailing vessel should be engineered by a qualified engineer for the actual case. JEFA MARINE takes no responsibility for any structural failures which might result from the use of these guidelines. |
![]() ![]() Installation example of the 6T bearing not using a fillet for stiffness but a web structure |
6T examples: |
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