Harken’s MKIV Underdeck Furling is the
perfect solution for performance racers and
cruisers who want an aerodynamic system
with a minimal amount of equipment above
deck. The drum is located beneath the
deck, lowering the tack height for
maximized sail area.
Easy Reefing and Furling:
Ball bearings between the center hub and deck bearing
provide low-friction furling.
Durable Materials and Construction:
Size 1 and larger: Aluminum line guard, torque tube,
and swivels are deep-saturation hardcoat-anodized for
no-fade UV stabilization and durability. The hardcoatanodized
line guard is urethane-coated for additional
The threaded height adjuster uses dissimilar metals
(stainless steel and bronze) to prevent galling.
Size 0: A one-piece integrated deck bearing and line
guard provides durability and corrosion resistance.
Easy to Maintain:
The furler can be flushed clean with detergent water like
The through-deck bearing minimizes water seepage into
the underdeck compartment.
1. Torque Tube Houses
Full-Length Turnbuckle -
The torque tube houses a full-length
turnbuckle for optimal mast rake and
Torque Tube Attachment
- A torque tube universal joint on Units 1, 2,
and 3 provides a high-strength universal
connection to allow ample headstay sag
when sailing downwind.
The Unit 0 features an articulating ball joint,
eliminating the universal joint and toggle to
reduce weight and to simplify maintenance.
3. Belowdeck Drum Fits Narrow Bows
- The small outside drum diameter lets unit fit
inside narrow bows.
4. Installation Options -
Units 1 and larger have self-locking threaded
height adjusters for a correct fit between the
chainplate and deck.
The Unit 0 does not need a height adjuster.
The furler and headstay are independent of
each other, allowing flexible installation
Harken Underdeck Furling Unit
We at Mauri Pro Sailing are fully committed to be your Harken Underdeck Furling Unit specialist not only providing the sailing community with a comprehensive and easy to use web site but with all the appropriate technical information that you might need to select your sailboat hardware and equipment. If you need any assistance selecting the appropriate Harken Underdeck Furling Unit
please contact us. Our crew is ready to help!