Harken 57mm Aluminum Loop Block

Item Number: 3214

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.


  • Sheave Ø (mm): 57 mm
  • Sheave Ø (in): 2 1/4 in
  • Length (mm): 76 mm
  • Length (in): 3 in
  • Weight (g): 92 g
  • Weight (oz): 3.23 oz
  • Maximum line Ø (mm): 12 mm
  • Maximum line Ø (in): 7/16 in
  • Maximum working load (kg): 1134 kg
  • Maximum working load (lb): 2500 lb
  • Breaking load (kg): 2268 kg
  • Breaking load (lb): 5000 lb
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