for US Continental orders over $99
Harken 57mm Black Magic Block - Double / Swivel / Low-Load
Our Part #: HAR3228 | Mfr. Part #: 3228
Sheave: 57 mm (2 1/4 in)
Length: 132 mm (5 3/16 in)
Weight: 342 g (12.05 oz)
Shackle Pin: 8 mm (5/16 in)
Maximum Line: 12 mm (7/16 in)
Maximum Working Load: 1250 kg (2755 lb)
Breaking Load: 2500 Kg (5510 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.
Low-load blocks have red isolators. They use Torlon® rollers and 316 stainless steel shackles. Standard blocks have 17-4 PH stainless headposts.
Torlon is a registered trademark of Solvay Advanced Polymers L.L.C.