Lewmar 50mm Synchro Block Max 12mm Line

The Lewmar 50mm Synchro Blocks are engineered for speed, efficiency, and superior handling. We use a combination of scientifically optimised block geometry, a Free-Spin bearing, and a 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.

Designed for speed, efficiency, and exceptional handling, Lewmar’s Synchro Blocks combine advanced engineering with practical innovation. Featuring scientifically optimised geometry, a free-spinning bearing, and a self-aligning head, these blocks reduce friction and deliver up to 40% greater efficiency compared to standard budget blocks in mainsheet systems. Every component works in harmony with the rope’s movement, ensuring smoother power transfer from deck to sail and significantly reducing rope wear.

• Versatile Head Design – Can be set in-line or at a 90° angle, or left to rotate freely when unlocked. When locked, it allows a 30° “float” on the shackle post for improved block alignment.
  
• Stainless Steel Strap – Enhances strength and extends service life.
  
• Glass Fibre Reinforced Cheeks – Rigid construction prevents lines from jamming.
  
• Tool-Free Swivel Locking Mechanism – Innovative sliding design for quick and easy adjustment

Features

• 10-12mm sailing line
• Practical switch from swivelling to fixed shackle
• 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

Specifications

• Max Line: 12mm
• Working Load: 450kg
• Sheave Diameter: 50mm
• Product Type: Hardware
• Hardware Type: Blocks
• Boat Type: Sail
• Block Type: Single
• Block Size: Single