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X5, Phoenix Catamarans © Phoenix Catamarans
MKIV furlers are some of the most preferred products in the Harken product line due to 
their high performance, reliability and ability to be reconfigured for racing. Now, Harken 
introduces MKIV Ocean offering MKIV quality, specifically configured for the cruising 
sailor. It is engineered with strength, longevity, ease of use, at the right price without 
extra features cruisers might not need.
For occasional racers, the MKIV line is engineered with ease, durability, and winning 
in mind. The split drum can be removed easily for use with racing sails, providing the 
longest possible luff length. The independent swivel supports optimal sail shape.
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.
•  Foils rotate around headstay so headstay load is isolated 
from the furling unit for easy furling. 
•  Large inner spool diameter increases mechanical 
advantage for powerful reefing and furling.
Stands up to sun, salt, and time
•  Aluminum line guard, torque tube, and swivels deep-
saturation hardcoat-anodized, UV-stabilized for durability.
• Line guard polyurethane-coated for wear protection.
•  Specially formulated low-stretch black line is 
abrasion and UV-resistant; standard on units 0, 1, 2.
•  Aerodynamic (MKIV) and round (MKIV Ocean), 
foils handle extreme reefing loads.
• Triple-interlock foil joints withstand years of torque 
 loading: foil connectors geometric shape interlocks 
 with foil; secures with syringe-injected adhesive; 
 screws provide final lock. 
MKIV & MKIV OCEAN JIB REEFING & FURLING
DO NOT use Harken equipment for human suspension unless product is specifically certified and labeled for such use.
MKIV
MKIV Ocean
Foil joints

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