105mm Synchro Single Block

LEWMAR 105mm Synchro Single Block

The Lewmar Synchro Single Block with 105mm sheave diameter is precision-engineered for sailors who demand top performance from their deck hardware. The Synchro range combines scientifically optimised block geometry with a proprietary Free-Spin bearing and self-aligning head to reduce friction and increase system efficiency by up to 40% compared to budget blocks — particularly in mainsheet systems where every fraction of friction matters.

Every component within the Synchro block is designed to move in perfect synchrony with the rope, providing a notably easier and smoother transfer of power from deck to sail while simultaneously reducing wear on the line. The result is a block that performs reliably under heavy and static loads across a wide range of sailing applications.

The 105mm sheave diameter minimises rope friction, and the block accommodates optimum line sizes of 14mm with a maximum of 16mm. With a safe working load of 3,500kg (7,700 lbs) and a weight of approximately 786g, this block is suited for larger performance and cruising vessels where power and reliability are paramount.

Its stainless steel strap construction improves structural strength and extends service life. The stiff glass fibre reinforced cheeks are specifically designed to prevent lines from wedging in the block, a common cause of operational failure under load. The innovative tool-free sliding swivel locking mechanism makes configuration changes quick and straightforward, allowing a practical switch between swivelling and fixed shackle modes without the need for tools.

Key Features

• Free-Spin bearing and self-aligning head reduce friction by up to 40% over budget blocks
• Stainless steel strap for improved strength and longer service life
• Stiff glass fibre reinforced cheeks to prevent lines from wedging
• Innovative tool-free sliding swivel locking mechanism
• Simple switch from swivelling to fixed shackle configuration
• Larger 105mm sheave diameter minimises rope friction
• Suitable for heavy and static load applications
• Ideal for halyard tuning, mainsheet systems, mast foot blocks, mast head blocks, and boom vang