HARKEN High Load Doube Block 57 mm Pulley

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. Specifications: - Sheave Ø (mm): 57 mm - Sheave Ø (in): 2 1/4 in - Length (mm): 132 mm - Length (in): 5 1/16 in - Weight (g): 336 g - Weight (oz): 11.86 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): 1633 kg - Maximum working load (lb): 3600 lb - Breaking load (kg): 3267 kg - Breaking load (lb): 7200 lb