Harken 57mm High Load Double Block with Becket – Black Magic Air (3218)
High-strength, twin-sheave block with becket for advanced sail control systems
The Harken 57mm High Load Double Block with Becket (3218) from the Black Magic® Air series is engineered for high-performance big boats where sail controls are under constant, demanding use. Ideal for mainsheet systems, it delivers superior strength, smooth operation, and layout flexibility for complex multi-part purchases.
This double-sheave block features Torlon® roller bearings running on a precision centre cage, which keeps the bearings aligned and reduces friction even at maximum load. The integrated becket adds versatility by providing a tidy termination point, making it perfect for cascaded or tackle systems.
Its swivel shackle head can rotate freely or be locked in two directions, helping to maintain fairleads and prevent line twist under varying loads and angles. The 3218 is a trusted choice for offshore racers and performance cruisers looking to combine high-load handling with compact efficiency.
Specifications
| Length (mm) | 152 |
| Recommended line - Max Ø (mm) | 12 |
| Sheave Ø (mm) | 57 |
| SWL (kg) | 1633 |
| NBL (kg) | 3267 |
| Weight (g) | 352 |
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