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Lewmar 50mm Sync Block Single Black


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Lewmar 50mm Sync Block Single



Lewmar Synchro blocks are engineered for speed, efficiency and superior handling. They use a combination of scientifically optimised block geometry, a Free-Spin bearing and self-aligning head to reduce friction and increase efficiency by up to 40% over budget blocks on mainsheet systems.Each component is perfectly synchronised with the movement of the rope, providing you with an easier, smoother transfer of power from deck to sail and less wear on your rope.


Plain bearing blocks are typically used for heavy and static loads in:

  • Halyard tuning
  • Mainsheet systems
  • Mast foot blocks
  • Mast head blocks
  • Boom vang
  • Stainless steel strap for improved strength and longer service life
  • Stiff glass fibre reinforced cheeks to prevent lines from wedging
  • Innovative design with “tool-free” sliding swivel locking mechanism
  • Simple switch to change from swivelling to fixed shackle
Part No Sheave Dia Working Load Limit Weight
L29925001BK 50mm 450Kg (990lb) 67g (2.36oz)
L29926001BK 60mm 800Kg (1760lb) 115g (4.06oz)
L29927201BK 72mm 1100Kg (2420lb) 190g (6.69oz)
L29929001BK 90mm 2000Kg (4400lb) 413g (14.57oz)

Additional information

Weight 85 g



Deck Hardware


Sail & Rig Control


Rigging Screws, Tensioners & Adjusters


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