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Selden Low Friction Rings
Selden Low Friction Rings
Selden Low Friction Rings

Black anodised aluminium

Large inner radius for low friction

Select by internal diameter:

Internal ØMaximum Line Ø
5mm 3mm
8mm 5mm
11mm 7mm
16mm 10mm
22mm 14mm
30mm 20mm


More Information

Selden low friction rings are an extremely versatile and lighter alternative to a plain bearing block.

Selden rings are produced in black anodised aluminium, have a big inner radius for low friction and an outer slot for rope or shock cord attachment to e.g. a deck or mast fitting

Suitable applications are backstay cascades, barber haulers, tweakers, kicker/vang purchases or any other control line lead with a static load.

Low friction rings are not designed to replace ball bearing or roller bearing blocks where free running or continuous adjustment under load are required.

Selden Low Friction Rings Specifications
SeldenInternal ØMaximum Line ØSWLMBLOutside Ø
420-500 5mm 3mm 150kg 300kg 12mm
420-501 8mm 5mm 350kg 700kg 18mm
420-502 11mm 7mm 750kg 1500kg 25mm
420-503 16mm 10mm 1500kg 3000kg 35mm
420-504 22mm 14mm 3000kg 6000kg 50mm
420-505 30mm 20mm 6000kg 12000kg 70mm

Internal Ø = the internal diameter of the hole inside the ring
Maximum Line Ø = the maximum diameter line that Selden recommend to use through the ring
SWL = Selden Safe Working Load (2:1 Safety Factor)
MBL = Manufacturer (Selden) Break Load
N.B. Outside Ø is actually the outside width dimension across the ring

Barber Hauling or Tweaking is a good example of where low friction rings provide an ideal solution:

Selden Barber Hauler DiagramSerlden Low Friction Ring

Barber Hauling, also known as "Tweaking" is the general term for applying downward pressure on a headsail sheet and/or pulling the clew to windward to improve the slot and increase leech tension.

Reeeve the ring onto the sheet, attaching the tweaker line to a strongpoint, suitably poisitioned inboard and aft of the mast step, one on either side of the deck to create a 2:1 purchase on the sheet.

Improved sail trim can then be achieved by tensioning the tweaker.

Stretch a bungee (elastic cord) from the ring to a shroud high enough to prevent the ring knocking the deck when it is not in use (lazy).