• block-friction-ring-nub
  • block-friction-ring-nub
  • block-friction-ring-nub

Block friction ring| Ring-Nub®


Ring-Nub® is an open spherical low-friction ring that withstands very high loads and is available for strings from 3 mm to 12 mm maximum.

Ring-Nub offers a unique combination of advantages in terms of performance, durability and ease of use. It's an excellent choice for applications where friction must be minimized and strength maximized.

See examples of NUB® low-friction ring applications with textile connectors (textile shackle, loop, erse, lock and hook) in the category PLUG & SAIL.

See features below

Volume discounts

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4 10% Up to €6.20

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+ Use

High load in dynamic use

  • 3D headsail adjustment

  • Backstay and tackle
  • Cascade for boom downhaul
  • Double sheet forwarders
  • Deck plates & tackle

... just about everything!

  • Ideal for reefing, cascade hoisting (backstay, vang, backstay), corner return, or even cap-de-mons on standing rigging (shrouds, sub-boom).
  • Easily installed anywhere on deck, chainplate, jib rail, mast foot...thanks to our various Dyneema® textile connectors.

Find out more about load forces as a function of deflection angle HERE

Data sheet

Ring-Nub® Open-type low-friction ring

  • NUB 40 Engineering polymer - Semi-crystalline thermoplastic with high mechanical strength and rigidity.
  • NUB 30/20/15 Polyamide 11 enriched with carbon fibers (recycled) to improve strength and minimize deformation.
  • Nub 20 316 L stainless steel is highly resistant to wear, heat and pressure, making it ideal for industrial applications and corrosive environments.

Bio-sourced technical polymer

  • Material: 30% carbon-filled PA11 (Recycled)
  • Coefficient of friction: 0.15
  • Tensile strength: 170 MPa
  • Modulus of elasticity: 8 GPa
  • Service temperature: -40°C to +180°C
  • Chemical resistance: Excellent
  • Excellent UV resistance
  • Origin: Castor oil (renewable)

Austenitic stainless steel AISI 316L or 1.4404 EN

  • Density: 8.0 g/cm³ Coefficient of friction
  • Coefficient of friction: 0.15 to 0.25
  • Tensile strength: 500 Mpa to 700 Mpa
  • Modulus of elasticity: 200 GPa
  • Service temperature: -270°C to +850°C
  • Excellent UV resistance
  • Origin: Ore

Product Details

anneau à friction Ring-Nub

Anneau à friction Nub



  • Optimized design for minimum weight.
  • Easy installation and handling.
  • Reduces hoist system inertia.


  • Available in several sizes and colors to suit different needs.
  • Suitable for a wide range of ropes (dyneema, polyester, etc.).
  • Can be used for a wide range of applications (sailing, rigging, climbing, etc.).

Easy to use:

  • Quick and easy installation without special tools.
  • Self-lubricating ring for minimal maintenance.


  • UV and weather resistant.
  • Long service life even in harsh conditions.

Additional benefits:

  • Durable, low-friction ring
  • Made in France