Harken 16mm Block

The Harken 16mm Block (model 404) is a compact, high-efficiency pulley designed for sailors and boaters who demand reliable, lightweight hardware on the water. Whether you're managing mainsheet systems, boom vang rigging, or jib controls, this block delivers the smooth mechanical advantage needed during long days under sail.

Built by Harken—a name synonymous with marine engineering excellence—the 16mm block handles moderate loads while maintaining the minimal weight penalty that serious crew appreciate in racing and cruising applications. At just 0.09 lbs and measuring 2 by 1 by 3 inches, the Harken 16mm block integrates seamlessly into tight spaces without sacrificing load distribution. The 16mm sheave diameter is engineered to accept standard line diameters used in modern sail plans, providing consistent bearing contact and reducing friction that would otherwise fatigue your sheets and halyards.

This block works best for sailors rigging systems where weight savings matter—daysailers, performance cruisers, and one-design racers benefit most from its compact profile. Installation is straightforward for anyone familiar with block-and-tackle configurations; simply attach to a secure mounting point using the provided or compatible hardware, then feed your line through the sheave.