This Harken Carbo Ratchamatic 57 mm single swivel block is an automatic, load-sensing ratchet block for sailing, where controlled line handling and low friction are essential.
The block runs freely in both directions under low loads and automatically engages the ratchet function when the load increases. This provides a smooth transition and better control over unloaded lines.
The load sensor can be adjusted as needed, allowing the block to be customized to the sailor's preferences and the specific application on board.
Key features
Automatic load-sensing ratchet function
Free running in both directions under low loads
Adjustable load sensor
For lines up to Ø10 mm
SWL 227 kg and breaking strength 907 kg
