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Rudder Bearings

Poly Flex Rudder Bearing and Seal Systems are designed specifically for the marine environment and come in a range of shaft sizes that vary from 1” to 3”.

The moulded components are manufactured from Polenite, a special range of engineering heat cured polymer alloys. All our components are proudly designed and manufactured by Poly Flex.

We can supply these as full Rudder Bearing kits, replacement parts and also unmachined blanks, depending on your requirements.

Poly Flex products are available directly from our manufacturing facility in Australia and via our USA, Europe, Asia Pacific and Middle East distributors. Find a distributor.

Shaft SizeEpoxy / Glass Tube IDEpoxy / Glass Tube ODTop Bearing ODTop Bearing PCDTop Bearing ThicknessBottom Bearing ODBottom Bearing Thickness
1″ (25mm)1 3/4″ (44.45mm)2 3/16″ (55.56mm)3 3/4″ (82.55mm)3″ (76.20mm)7/8″ (22.22mm)2 1/2″ (65mm)3/8″ (9.52mm)
1 1/8″ (28mm)1 3/4″ (44.45mm)2 3/16″ (55.56mm)3 3/4″ (82.55mm)3″ (76.20mm)7/8″ (22.22mm)2 1/2″ (65mm)3/8″ (9.52mm)
1 1/4″ (30mm)1 3/4″ (44.45mm)2 3/16″ (55.56mm)3 3/4″ (82.55mm)3″ (76.20mm)7/8″ (22.22mm)2 1/2″ (65mm)3/8″ (9.52mm)
1 1/2″ (40mm)2″ (50.80mm)2 7/16″ (61.91mm)4 1/4″ (107.95mm)3 1/2″ (88.90mm)7/8″ (22.22mm)3″ (75mm)1/2″ (12.70mm)
1 3/4″ (45mm)2 3/8″ (60.32mm)2 3/4″ (69.85mm)4 3/4″ (120.65mm)4″ (101.60mm)1″ (25.4mm)3 1/2″ (88.90mm)5/8″ (15.87mm)
2″ (50mm)2 3/4″ (69.85mm)3 1/4″ (82.55mm)5 1/4″ (133.35mm)4 1/2″ (114.30mm)1″ (25.4mm)4″ (101.60mm)5/8″ (15.87mm)
2 1/2″ (65mm)3 1/2″ (88.90mm)4 1/8″ (104.77mm)7 1/4″ (184.15mm)6 1/2″ (165.10mm)1 1/8″ (28.57mm)5″ (127mm)5/8″ (15.87mm)
2 3/4″ (70mm)4 1/4″ (107.95mm)5″ (127mm)8″ (203.20mm)7 1/4″ (184.15mm)1 1/4″ (30mm)6″ (152.40mm)5/8″ (15.87mm)
3″ (75mm)4 1/4″ (107.95mm)5″ (127mm)8″ (203.20mm)7 1/4″ (184.15mm)1 1/4″ (30mm)6″ (152.40mm)5/8″ (15.87mm)

8, 10 or 12mm thick Wear Washer / Spacer can also be supplied on request for all size shafts.

Metric sizes available shown in brackets.

Other sizes available on request.

NOTE: When the application requires the fitting of the Epoxy/Glass tube, the rudder (Construction) tube should have a INSIDE diameter at least 5/16″ (8mm) larger than the OUTSIDE diameter (OD) of the Epoxy/Glass tube.

  1. Roughen the outer surface of the Epoxy/Glass tube (80 Grit Paper), clean thoroughly.
  2. Prepare “Chock-Fast” for an 5/16″ (8mm) gap around the Epoxy/Glass tube and fill making sure it is located centrally.

Epoxy/Glass Tube Lengths: Standard 500mm Long – Longer lengths available on order

The Poly Flex Rudder Bearing and Seal System is manufactured specfically for the marine environment.

  1. Extremely strong, dry lubricant impregnated polymer bearings top and bottom, with nitrile ‘O’ rings and grease seal.
  2. An all Stainless Steel grease nipple (including the ball and spring)
  3. A mandrel wound oven cured pre-impregnated Epoxy/Glass tube.

The Poly Flex Rudder Bearing System offers boat builders some considerable advantages:

  1. The bearing alignment is achieved precisely.
  2. Electrolysis is minimised as there is no dissimilar metals.

View PDF sheet for recommended installation procedures