Harken 57mm High Load Triple Block – Black Magic Air (3219)
Maximum mechanical advantage for high-load, high-frequency sail systems
The Harken 57mm High Load Triple Block (3219) from the Black Magic® Air series is built for big boat mainsheet systems where maximum purchase, durability, and efficiency are required. With three sheaves running on low-friction Torlon® roller bearings, it delivers smooth, reliable power transmission in even the most demanding race conditions.
The precision-engineered centre cage ensures the bearings remain separated and aligned, minimising friction under load and maintaining optimal sheave rotation. Constructed with Hard Lube-anodised aluminium sideplates and sheaves, the block offers superior UV resistance and long-term durability.
The swivel shackle head can be locked in two directions or left to rotate freely, allowing flexible mounting and clean, twist-free line leads across a range of rigging configurations.
Designed for performance cruisers and offshore racing teams, the 3219 is the go-to solution when system efficiency and load capacity are non-negotiable.
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