Harken 75mm Aluminum Block (w/Swivel)

Item Number: 3231

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.


  • Sheave Ø (mm): 75 mm
  • Sheave Ø (in): 2 15/16 in
  • Length (mm): 129 mm
  • Length (in): 5 1/8 in
  • Weight (g): 331 g
  • Weight (oz): 11.68 oz
  • Shackle pin Ø (mm): 8 mm
  • Shackle pin Ø (in): 5/16 in
  • Maximum line Ø (mm): 14 mm
  • Maximum line Ø (in): 9/16 in
  • Maximum working load (kg): 2268 kg
  • Maximum working load (lb): 5000 lb
  • Breaking load (kg): 4536 kg
  • Breaking load (lb): 10000 lb
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