HARKEN 45mm Black Magic® AirBlock, Single Loop Block
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The Harken 45 mm Aluminum Loop Block (Part No. 3389) is part of the Black Magic Air series, a top choice for big-boat performance racers and cruisers who demand low-friction, high-load control. Engineered for sail-control systems that see constant, heavy use—mainsheet, runner, halyard, and spinnaker—this single block delivers free-running performance with minimal weight. A precision center cage keeps the Torlon® roller bearings separated and parallel, dramatically reducing friction so lines run smoothly under load. The sheave center carries the primary load, which allows Harken to build a smaller, lighter block without sacrificing strength. The soft-attachment loop design features a removable deadend post for direct attachment to a padeye, and lashings can be used as an alternative rigging method for a clean, low-profile installation.
Key Features:
45 mm (1-3/4 in) sheave diameter
Maximum line diameter: 10 mm (3/8 in)
Maximum working load: 750 kg (1,653 lb)
Torlon® roller bearings held in a center cage to minimize friction
Sheave-centered load path for a smaller, lighter block
Soft-attachment loop design with removable deadend post for direct padeye attachment
Lashing-compatible for a low-profile rigging alternative
Ideal for mainsheet, runner, halyard, and spinnaker control systems
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