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Single Tii-On - Allen
  • Single Tii-On - Allen
  • Single Tii-On - Allen


Single Tii-On Blocks


The 40mm single tii-on block is Allen go-to dinghy mainsheet block. Also ideal for dinghy jib and spinnaker sheeting systems as well as keelboat control lines.

  • Feature a stainless-steel loop at the head of the block.
  • Offer maximum strength and reliability with minimal cheek separation when tied on and loaded up with a soft shackle. 
  • Available with or without a soft shackle.

Becket – The large central rivet not only reduces the overall weight but also offers a rope friendly attachment, perfect as a tie-off point when being used in a cascade system.

Bearings – Dynamic Blocks feature our patented bearing system which uses twin rows of stainless-steel ball bearings running on a stainless-steel rail. This provides a superior load-carrying ability and longevity when compared to other bearing systems which run on a plastic rail.

Fitting Instructions – Tii-On blocks rely on the correct attachment method to give them maximum strength.

  • When attaching a Tii-on block you must feed the rope around the central axle and through the head of the block.
  • When possible, Tii-on blocks should be attached with a crossed/ through threaded line. (see pictures for example).This is very important, as it keeps the line load pulling the side cheeks together.
  • When using a Tii-Shackle, when possible cross the lines. Only use a non-crossed Tii-Shackle on low-load applications. See the picture of the block attached to a lacing eye for example on how to cross the Tii-Shackle.