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Continue ShoppingHARKEN 57mm Aluminum Triple Block — Swivel, 3219
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.
Sheave Ø (mm) | 57 mm |
Sheave Ø (in) | 2 1/4 in |
Length (mm) | 132 mm |
Length (in) | 5 3/16 in |
Weight (g) | 378 g |
Weight (oz) | 13.34 oz |
Shackle pin Ø (mm) | 8 mm |
Shackle pin Ø (in) | 5/16 in |
Maximum line Ø (mm) | 12 mm |
Maximum line Ø (in) | 7/16 in |
Maximum working load (kg) | 2200 kg |
Maximum working load (lb) | 4850 lb |
Breaking load (kg) | 4400 kg |
Breaking load (lb) | 9700 lb |
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