Harken 57mm Aluminum Double Block - w/Swivel

$431.99
Item Number: 3217

Harken 57mm Aluminum Double Block - w/Swivel usually available 2-5 business days upon ordering.

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 3/16 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

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