50mm single Tii-on block


suitable for numerous applications including catamarans up to 16ft.


The Allen 50mm dynamic ball bearing block is simply the best designed and engineered block on the market.
  • Line friendly soft contours and articulation
  • Stainless steel cheeks and inner bearing systems handle maximum loads
  • Central hole for tie-on becket
  • length 72mm
  • line size 5-10mm
  • MDL 300kg
  • break load 900kg
  • weight 70gms
The new Tii Block range is a perfect example of product development driven by customer feedback.
A rope friendly, smooth stainless steel ring in the top of the block holds it together providing maximum strength and durability under load whilst completely eliminating block capsizing.
Furthermore, the Tii range is 20-30% lighter than the equivalent standard block and still features our patented dynamic bearing system.