Harken is closed November 26-29. Orders received during this time will be processed Monday November 30.

mouseover to enlarge
Underdeck Furling System — 3 mm Luff Wire Underdeck Furling System — 3 mm Luff Wire Underdeck Furling System — 3 mm Luff Wire Underdeck Furling System — 3 mm Luff Wire
click thumbnail to select

Small Boat Underdeck

Underdeck Furling System — 3 mm Luff Wire

Part No. 477
$1,069.00  Not available on-line. Please contact your Harken dealer.
Drum Ø (mm)79 mm
Drum Ø (in)3 1/8 in
Maximum luff wire Ø (mm)3 mm
Maximum luff wire Ø (in) 1/8 in
Maximum working load (kg)431 kg
Maximum working load (lb)950 lb

Small Boat underdeck furling units are ideal for sportboats and daysailers from 4.8 m to 9 m (16 to 30 ft). The drum is located beneath the deck, lowering the tack height for maximized sail area. An optional hoistable ball bearing halyard swivel can be installed on your headstay so you can raise or lower the sail without removing the headstay. Swivels are independent of the headstay, allowing you to tension the luff separately from the mast rake.

Pin-to-pin length (mm)156 mm
Pin-to-pin length (in)6 1/8 in
Drum Ø (mm)79 mm
Drum Ø (in)3 1/8 in
Maximum line Ø (mm)4 mm
Maximum line Ø (in)5/32 in
Jaw width (mm)8 mm
Jaw width (in) 5/16 in
Maximum luff wire Ø (mm)3 mm
Maximum luff wire Ø (in) 1/8 in
Clevis pin Ø (mm)6 mm
Clevis pin Ø (in)1/4 in
Weight (g)661 g
Weight (oz)23.3 oz
Maximum working load (kg)431 kg
Maximum working load (lb)950 lb
FootnoteIncludes drum and upper swivel. Does not include hoistable swivel. 
Manual: 4428.pdf (open/save)
DWG: 477.DWG (open/save)
DXF: 477.DXF (open/save)
IGS: 477.IGS (open/save)
EPS: 477.eps (open/save)
High-res JPG: 477.jpg (open/save)

DO NOT use Harken equipment for human suspension unless product is specifically certified and labeled for such use.

  • United States
  • Australia
  • France
  • Italia
  • New Zealand
  • Polska
  • Sverige
  • UK