Single block Synchro
fiddlefrictionmast foot

single block
single block
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Number of sheaves
fiddle, friction, mast foot
with swivel
Bearing type
plain bearing
Maximum line diameter
max. rope ø 12 mm, max. rope ø 10 mm, max. rope ø 14 mm
Application domain
for sailboats
halyard, boom
stainless steel
Working load

450 kg, 800 kg, 1,100 kg, 2,000 kg
(992.1 lb, 1,763.7 lb, 2,425.1 lb, 4,409.2 lb)


Lewmar's Synchro Blocks are engineered for speed, efficiency and superior handling. We 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. Features 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

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*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.