57mm Aluminum Double Loop Block
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Harken 57mm Aluminum Double Loop Block
The Black Magic Air blocks are a top favorite among big boat performance racers and cruisers seeking lightweight, free-running, and powerful sailing hardware. These blocks are engineered specifically for sail controls that experience heavy use, including mainsheet, runner, halyard, and spinnaker systems.
The block's innovative design centers on a Torlon® roller bearing cage that keeps bearings separated and parallel to minimize friction and extend bearing life. By positioning the sheave center to carry the primary load, the design allows for a smaller, lighter block without compromising strength or durability. This configuration delivers exceptional performance and reliability in demanding racing conditions.
The soft-attachment loop block features a removable deadend post that provides flexible mounting options. Users can attach the block directly to a padeye with the post in place, or remove the post entirely and use lashings for alternative rigging configurations. This versatility makes the block suitable for a wide range of boat designs and control systems.
Key Features
- 57mm (2 1/4 in) aluminum sheave diameter
- Lightweight construction: 168g (5.93 oz)
- Maximum working load: 1134 kg (2500 lb)
- Breaking load: 2268 kg (5000 lb)
- Accommodates up to 12mm (7/16 in) line diameter
- Torlon® center cage for low-friction operation
- Removable deadend post for flexible attachment options
- Ideal for mainsheet, runner, halyard, and spinnaker applications
- Proven performance in professional racing environments
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