57mm Aluminum Low-Load Block — Swivel
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Harken 57mm Aluminum Low-Load Block — 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, enabling smooth operation even under demanding conditions.
Shackle blocks lock in two directions or swivel to keep line from twisting, providing versatility in rigging configurations. Low-load blocks have red isolators and use Torlon® rollers with 316 stainless steel shackles for corrosion resistance. Standard blocks feature 17-4 PH stainless steel headposts for structural durability.
Key Features
- 57mm sheave diameter for optimal line compatibility
- Swivel shackle design prevents line twisting
- Center cage keeps roller bearings separated and parallel
- Red isolators for low-load applications
- Torlon® roller bearings for smooth performance
- 316 stainless steel shackle for corrosion resistance
- 17-4 PH stainless steel headpost construction
- Lightweight aluminum construction
- Maximum working load of 1655 lbs (750 kg)
Torlon is a registered trademark of Solvay Advanced Polymers L.L.C.
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