Which friction ring for which use ? 

Friction rings, or to use the correct terminology, "low friction rings", will easily find their place on your boat as a replacement for a block (asymmetrical spinnaker tack, reefing lines, cascade, mast foot block...)

Associated with our textile connectors: shackle, loop, erse in Dyneema® and our locking systems (Twist Lock / Ring Block), NodusFactory™ friction rings will bring you strength, lightness and performance to equip and rig your sailboat.

Made of different materials depending on their intended use, our material comparison will help you choose your ideal low friction ring.

Comparison chart: the different friction rings

Material Durability / Wear Friction T° of use T° Celsius Dynamic Static Material price
ITECH 5/5 5/5 4/5 + 140° / 180° 5/5 4/5 5/5
ALUMINIUM 4/5 4/5 5/5 + 180° / 240° 4/5 5/5 4/5
PEEK 4/5 3/5 4/5 + 140° / 180° 4/5 5/5 3/5
POM 3/5 4/5 2/5 100° 3/5 3/5 2/5
PA66 4/5 3/5 3/5 120° 3/5 3/5 2/5

If you are looking for the #1 low friction ring that performs like a basic pulley, the iTech 10/14/20 series is for you:

  • Wear life superior to metal
  • +/- 6900 hours in continuous friction
  • +/- 200,000+ halyard sends, tacking, sail trim,...
  • 80% lighter than metal



The best glide is not smooth !

The coefficient of friction is the ratio of the sliding force to the holding force produced when two surfaces come into contact. There are several types of friction coefficients and also several formulas to calculate them.

Briefly, there are two types of friction coefficients:

  • The static (or starting) coefficient of friction is the maximum force required to start the sliding motion.
  • The kinetic friction coefficient, also called dynamic friction coefficient, is the force that is measured during the sliding of a mass on a support.

Value as an example: The dream is close to 0 !

  • Aluminum not lubricated = 1.35 lubricated = 0.30
  • Polymer iTech lubricate = 0.18

Nodus Factory Fittings & Tip

Dyneema® and Spectra®, high modulus polyethylene is the ideal fiber for friction rings of all materials because it is very slippery.