Harken 57mm Aluminum Double Loop Block

Harken 57mm Aluminum Double Loop Block

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. The sheave center carries primary load, allowing a smaller, lighter weight block. The soft-attachment Loop block has a removable deadend post for attachment to a padeye. Lashings can also be used.

Torlon is a registered trademark of Solvay Advanced Polymers L.L.C.

Sheave Ø (mm) - 57

Sheave Ø (in) - 2 1/4

Length (mm) - 76

Length (in) - 3"

Maximum line Ø (mm) - 12

Maximum line Ø (in) - 7/16

Maximum working load (kg) - 1134

Maximum working load (lb) - 2500

Weight (g) - 168

Weight (oz) - 5.93

Breaking load (kg) - 2268

Breaking load (lb) - 5000