Lewmar, Synchro Block, Single

$24.95 to $52.50
$24.95 to $52.50

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
  • Innovative design with "tool-free" sliding swivel locking mechanism
Applications Plain bearing blocks are typically used for heavy and static loads in:
  • Halyard tuning
  • Mainsheet systems
  • Mast foot blocks
  • Mast head blocks
  • Boom vang
Practical switch from swivelling to fixed shackle
Item #
Lewmar, 60mm Synchro Block Single
Item #:531948-60mm
SWL: Single
Type: 4.1 oz.
Lewmar, 72mm Synchro Block Single
Item #:531948-72mm
SWL: 2,420 lbs.
Type: Single
Weight: 6.7 oz.
Lewmar, 50mm Synchro Block Single
Item #:531948-50mm
SWL: 990 lbs.
Type: Single
Weight: 2.4 oz.

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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.