for US Continental orders over $99
Harken 57mm Black Magic Block - Double / Swivel
Our Part #: HAR3217 | Mfr. Part #: 3217
Sheave: 57 mm (2 1/4 in)
Length: 132 mm (5 3/16 in)
Weight: 336 g (11.86 oz)
Shackle Pin: 8 mm (5/16 in)
Maximum Line: 12 mm (7/16 in)
Maximum Working Load: 1633 kg (3600 lb)
Breaking Load: 3267 Kg (7200 lb)
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.