Description
Harken 57mm Black Magic Air Double Becket Block is a top favourite 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 centre cage keeps Torlon® roller bearings separated and parallel to reduce friction. Shackle blocks lock in two directions or swivel to keep line from twisting.
Torlon is a registered trademark of Solvay Advanced Polymers L.L.C.
| Sku | Name | Sheave Ø mm (in) | Length mm (in) | Weight g (oz) | Maximum line Ø mm (in) | Maximum working load kg (lb) | Breaking load kg (lb) | Shackle pin Ø mm (in) |
|---|---|---|---|---|---|---|---|---|
| 3218 | 57 mm Black Magic Air Aluminium Double Block — Swivel, Becket | 57 (2 1/4) | 152 (6) | 352 (12.43) | 12 (7/16) | 1633 (3600) | 3267 (7200) | 8 (5/16) |
