Harken 57Mm Aluminum Low Load Black Magic Block W/Swivel

SKU: CWR-93959
Out of stock
Out of stock
Unit Price
US$ 178.99
US$ 202.70
Out of stock

57mm Aluminum Low Load Black Magic Block with Swivel

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 the line from twisting. Low-load blocks have red isolators. They use Torlon® rollers and 316 stainless steel shackles. Standard blocks have 17-4 PH stainless head posts. Torlon is a registered trademark of Solvay Advanced Polymers L.L.C.


  • Sheave: 57mm/2-1/4in
  • Length: 119mm/4-11/16in
  • Weight: 154g/5.44oz
  • Shackle Pin: 6mm/1/4in
  • Maximum Line: 12mm / 7/16in
  • Maximum Working Load: 7/16kg / 1655lbs
  • Breaking Load: 1500kg / 3300lb
  • Shipping from
    This product is shipped from our warehouse in , NJ, United States
    Our guarantee
    This product is brand new and includes the manufacturer's warranty, so you can buy with confidence.
    A 25% handling charge is levied against all authorized returns except those due to our error. Unauthorized returns are subject to a 40% handling charge. Damages & defects must be reported to us within 14 days.
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