Harken 57mm Aluminum Loop Block - Wide
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.
| Part Number | HKN-3387 |
| Sheave Ø (mm) | 63 mm |
| Sheave Ø (in) | 2 1/4 in |
| Length (mm) | 88 mm |
| Length (in) | 3 4/10 in |
| Width (mm) | 35 mm |
| Width (in) | 1 3/8 in |
| Weight (g) | 181.3 g |
| Weight (oz) | 6.4 oz |
| 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 |
