Harken MKIV Unit 4

Nothing beats the MKIV Jib Reefing & Furling line for effortless headsail control and great sail shape for optimal speed. With its ability to reef, simply furl and unfurl instead of changing sails to suit conditions, reduce speed, or gain visibility off the bow. Split drum removes for racing. Independent halyard and tack swivels furl sail center before head and tack for improved sail shape when reefed. Precision-extruded, double-groove Air foils for smooth sail handling and fast sail changes. Typical Boat Length 19.8 - 24.4 m (65' - 80')

Low-friction efficiency for easy furling and reefing

Multiple rows of Torlon® ball bearings in high-load areas minimize friction. Stacked bearing races evenly distribute radial and thrust loads; drum and halyard swivel turn freely under load.

Designed for easy installation

Drum assembly fits over existing turnbuckle allowing easy length adjustment. Harken toggle assembly accepts standard turnbuckle using swage, rod, Norseman, or STA-LOK® terminals.

Improved sail shape and boat control

Independent halyard and tack swivels furl sail center before head and tack for improved sail shape when reefed. Lightweight aluminum halyard swivel saves weight aloft to reduce pitching and heeling.

Fast hoists, douses, reefs, and sail changes

Precision-extruded, double-groove Air foils for smooth sail handling and fast sail changes. Stainless steel feeder allows fast singlehanded hoist and sail changes.

Split drum removes easily for racing

Line guard and spool remove easily for use with full-hoist sails.

Collection: Harken MKIV Unit 4