Lewmar 50mm Synchro Halyard Block

Lewmar 50mm Synchro Halyard Block
SKU: 543209
Mfg# 29925021BK
LFS# LMR29925021
UNIT: Each
In Stock - Ships out in 1 Business Day


Lewmar's Synchro blocks are engineered for speed, efficiency and superior handling. We use a combination of scientifically optimized 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 synchronized 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.

  • Stainless steel strap for improved strength and longer service life
  • Stiff glass fibre reinforced cheeks to prevent lines from wedging
  • Practical switch from swiveling to fixed shackle

Plain bearing blocks are typically used for heavy and static loads in:
  • Halyard tuning
  • Mainsheet systems
  • Mast foot blocks
  • Mast head blocks
  • Boom vang

The toggle heads of the halyard blocks are designed to fit on the studs commonly found at mast bases - check the diameter of the stud against the width of the block jaws and pin diameter.



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All Ladders have a Four (4) year Structural Warranty.


  • All returns must be started within 30 days of receipt of the order.
  • Manufacturer defects reported within 30 days of receipt will be supplied a pre-paid label for return shipping upon approval.
  • Please contact Go2marine LFS Marine and Outdoor for Manufacture Defects, Returns and help with Warranties.