Harken 57mm Aluminum Double Block - Swivel
Black Magic Air blocks are a top favorite of Big Boat performance racers and cruisers. These lightweight, free-running, powerful performers are used for sail controls that see lots of action: mainsheet, runner, halyard, and spinnaker systems. A center cage keeps Torlon® roller bearings separated and parallel to reduce friction. Shackle blocks lock in two directions or swivel to keep line from twisting. Torlon is a registered trademark of Solvay Advanced Polymers L.L.C.
| Part Number | Sheave Dia. | Length | Weight | Shackle Pin Dia. | Max. Line Dia. | Max. Working Load | Breaking Load |
|---|---|---|---|---|---|---|---|
| HKN-3217 | 57mm | 132mm | 336g | 8mm | 12mm | 1633kg | 3267kg |
