Lewmar 72mm Synchro Block - Single

The Lewmar 72mm Synchro Block – Single is a precision rigging component designed for sailors and boat operators who demand reliable, efficient sail control. This single block serves as a fundamental building block in mainsheet, jib, or control line systems where load management and directional change are critical. Whether you're racing competitively or cruising coastal waters, this block's compact footprint and proven Lewmar engineering make it an essential addition to any modern sailboat's running rigging.

Built with Lewmar's signature Synchro design, this 72mm block features a smooth-running sheave and low-friction construction that minimizes energy loss as line passes through under tension. The compact 2 x 2 x 4-inch profile and lightweight design make it easy to integrate into existing systems without adding unnecessary weight aloft. The single-block configuration is ideal for applications requiring a simple redirect, mechanical advantage preparation, or integration into multi-block tackle systems where precise load distribution matters.

This block is best suited for sailors upgrading aging rigging systems or builders outfitting new vessels with premium hardware. It pairs seamlessly with standard marine fastening methods and works across a broad range of line sizes typical on small to mid-sized cruising and racing sailboats. Installation is straightforward—secure the block to your mast, boom, or deck using appropriate through-bolts or tang fittings, then run your line through the sheave.