Harken 57mm Aluminum Block - w/Swivel

$213.99
Item Number: 3215

Harken 57mm Aluminum 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): 119 mm
  • Length (in): 4 11/16 in
  • Weight (g): 152 g
  • Weight (oz): 5.36 oz
  • Shackle pin Ø (mm): 6 mm
  • Shackle pin Ø (in): 1/4 in
  • 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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