Description
Harken 57mm Aluminum Low Load Double 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. Shackle blocks lock in two directions or swivel to keep 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 headposts. Torlon is a registered trademark of Solvay Advanced Polymers L.L.C.
Technical Description
| Sheave Ø (mm) | 57 mm |
| Sheave Ø (in) | 2 1/4 in |
| Length (mm) | 132 mm |
| Length (in) | 5 3/16 in |
| Weight (g) | 342 g |
| Weight (oz) | 12.05 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) | 1250 kg |
| Maximum working load (lb) | 2755 lb |
| Breaking load (kg) | 2500 kg |
| Breaking load (lb) | 5510 lb |
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