Description
Harken 57mm-100mm Black Magic Air Double Blocks are 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) |
|---|---|---|---|---|---|---|---|---|
| 3217 | 57 mm Black Magic Air Aluminium Double Block — Swivel | 57 (2 1/4) | 132 (5 3/16) | 336 (11.86) | 12 (7/16) | 1633 (3600) | 3267 (7200) | 8 (5/16) |
| 3233 | 75 mm Black Magic Air Aluminium Double Block — Swivel | 75 (2 15/16) | 134 (5 1/4) | 721 (25.44) | 14 (9/16) | 3402 (7500) | 6804 (15000) | 10 (3/8) |
| 3248 | 100 mm Black Magic Air Aluminium Double Block — Swivel | 100 (3 15/16) | 227 (8 15/16) | 1284 (45.28) | 16 (5/8) | 4990 (11000) | 9979 (22000) | 12 (1/2) |
