Lash Thimbles – What are they, and how do I use them?

Published Date: March 14 2019

Rope Thimble CC Kohlhoff
Lash thimble, ferrule, rope thimble, bobbin or low friction ring…
Whatever you call them, there’s no denying they are the perfect (low cost!) solution for a multitude of applications.
Rope Thimble Bobstay Rigging CC KohlhoffPerhaps the most flexible piece of sailing hardware on the market, lash thimbles can be used to tackle a variety of tasks and have several advantages that give them the edge on alternative sailing gear.

Manufactured from hard, anodised aluminium, rope thimbles are simple yet effective. Robust, durable and strong, lash thimbles are designed for rope to either run through them, or around their perimeter when spliced.


Available in several diameters and sizes, unlike blocks, lash thimbles contain no moving parts. Although this means rope thimbles provide more friction than a block, they are manufactured from materials that are designed to keep friction at a minimum, plus no moving parts means there’s no need to worry about breaking cheeks or damaging bearings!


As a result, lash thimbles are perfect for applications that require low speed, low
line movement and low angle (as deflection increases, so does friction).Rope Thimble Reefing CC Kohlhoff


Armed with some Dyneema® single braid (which is slippery and runs smoothly) and a handful of rope thimbles, replace blocks or transform your boat with an infinite number of lightweight, efficient systems – limited only by your imagination!


Replace clunky metal fittings with onboard systems that are not only extremely strong (lash thimbles have a higher working load relative to equivalent block size!), but easy to configure and extremely cost effective. Plus, these low friction rings don’t chafe your line!


So, what can I do with lash thimbles?

  • Replace blocks – suitable for small lines, plus soft attachment lash thimbles don’t bang on the deck
  • Purchase systemsRope Thimble Line Deflection CC Kohlhoff
  • Small line deflection – lash rings are the perfect choice for changing the angle of a line E.g. furling lines, forequy, afterguy, inhauler, outhauler, sheets, control lines
  • Lazy jack systems
  • Backstay cascades – however, due to the 180-degree angle, be aware this will provide more friction than a block system
  • Strops and fairleads
  • Static lines that don’t require a lot of dynamic adjustment – E.g. preventer, check stays, running backstays, barber hauler
  • Reefing lines
  • … Pretty much anything!

If you have any questions about rings and ferrules, please feel free to email us at, or click the link below to see our full range:

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We are constantly reporting on the latest innovations in the marine industry which offer weight savings whilst, at the same time, increasing safety factors. The result: lighter, faster, safer and more exciting sailing.

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