Harken 57mm Carbo Single Ratchet Block w/Swivel & Becket

The Harken 57mm Carbo Single Ratchet Block with Swivel & Becket is a precision sail handling device engineered for sailors who need to manage heavy loaded lines under controlled conditions. Built on Harken's proven ratchet technology, this block combines holding power with the ability to ease line tension smoothly by hand, making it essential gear for cruising and racing applications where load management and crew safety are paramount.

The 57mm carbon sheave accommodates line diameters up to 10mm (3/8 inch) and is rated for a maximum working load of 227 kg (500 lbs), delivering substantial mechanical advantage without requiring mechanical power. The ratchet mechanism allows sailors to hand-hold even heavily loaded sheets and control easing with precise fingertip pressure—critical when running downwind in variable conditions or when deck crew availability is limited. The integrated swivel and becket provide flexible mounting options on boom, rail, or deck hardware, while the corrosion-resistant materials perform reliably in salt-air environments.

This block is purpose-built for cruising sailors, racing crews, and any vessel operating with reduced crew or demanding sea states where controlled load management prevents rope injuries and extends sail life. The balance between holding capacity and manual ease-off makes it particularly valuable on boats where winches are impractical or where crew strength varies. Whether managing mainsail vang, jib sheet, or boom control lines, the Harken 57mm ratchet block delivers dependable performance in the demanding marine environment.