57MM HARKEN ZIRCON BLOCKS
Zircon blocks are the most efficient small boat blocks Harken has ever made. At the core of Zircon performance are industrial ceramic ball bearings mounted inside caged races. Zircon bearings are more than 700% stronger in compression than stainless bearings of the same size so, they won’t deform if used within the recommended load limits. More importantly, they don’t absorb as much energy before starting to roll resulting in a very responsive, low friction, and free running block.
Our larger Zircon sheaves offer great feel and response, working particularly well as kite sheet blocks and main sheet purchase on dinghies and smaller/performance keel boats.
Specifications
| Variant | Max Work L (kg) | Break Load (kg) | Weight (g) |
Part no. |
| 57mm Single | 150 kg | 450 kg | 44.8 g | 2195 |
| 57mm Single Becket | 150 kg | 450 kg | 51.4 g | 2196 |
| 57mm Double | 300 kg | 900 kg | 86.4 g | 2197 |
| 57mm Double Becket | 300 kg | 900 kg | 92.7 g | 2198 |
| 57mm Triple | 450 kg | 1350 kg | 128 g | 2199 |
57mm Zircon sheaves take a maximum line of 10mm
57mm Zircon triple and triple becket block available to purchase via pre order.