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Small Boat Furling | Spinnaker Staysail & Gennaker | Code Zero Furling | Unit 00AL Jib Reefing & Furling | MKIII Jib Reefing and Furling | How To Size Furling Units | Carbon Reefing & Furling Systems | MKIII Hydraulic Jib Reefing and Furling | Furling Accessories

Furling Systems > MKIII Hydraulic Jib Reefing and Furling

The only hydraulic furling with investment-cast stainless steel gear housing and double-enveloping, cone-drive worm gear.

MKIII hydraulic furling allows you to reef, furl, or set sails with the touch of a button. The MKIII hydraulic furler is made of Hardkote-anodized aluminum, with investment-cast stainless steel components polished to a high luster. The streamlined housing fits easily within existing pulpits. Double swivels at the tack and head help shape sails when reefing.

A standard winch handle activates the headstay adjustment and tensioning system, which uses a self-locking bevel gear leadscrew mechanism in a sealed oil bath. When a winch handle is inserted, the manual override automatically diverts oil flow from the hydraulic motor to prevent accidental activation of the powered system.

The furler's lower toggle rotates 90° and accepts any chainplate direction. The reversible hydraulic drive uses a high-reduction, double-enveloping worm gear to prevent a reefed sail from unfurling under load.

Suitable for cruising boats from 50' to 120' (15 m to 36.6 m) with headstays as large as 1" (25 mm) wire or-115 (22.2 mm) rod.

Worldwide parts and service.

Carbon Hydraulic Jib Reefing and Furling

Our carbon hydraulic Jib Reefing and Furling systems combine the beauty of stainless with the elegant finish of carbon. Stunning to look at, these UV resistant foils have proved themselves over and over in the extreme conditions found in round the world racing and cruising.

Single groove foils are filament wound of standard modulus carbon fiber that maximizes torsional resistance and saves 30 Ibs (13 kg) to 200 Ibs (90 kg) over their aluminum counterparts. The lower unit features a carbon fiber torque tube and cowling. Soft Spectra® line attachments are used for the halyard, head and tack and eliminate the need for heavy welded lugs and shackles. Call for availability.

1. Independent Head Swivels

Independent swivels at head and tack improve sail shape when partially furled.

2. Torlon® Ball Bearings

Large-diameter Torlon® ball bearings in halyard and tack swivel minimize friction, require no lubrication or isolating seals.

3. Strong Foils

Aerodynamic Air Foils® handle extreme reefing loads. Tough triple-interlock foil joints are shaped to match foils and secured with screws; adhesive removes point loading—withstands years of torque loading.

4. Stainless Steel Gear Housing

Stainless steel investment-cast gear housing features hardened steel gears running in oil.

5. Manual Override System

MKIII hydraulic furlers feature a winch handle driven manual override system. Flip switch, insert winch handle—manual override automatically diverts fluid from hydraulic system for safe operation.

6. Son Attachment for Halyard, Head and Tack on Carbon Units

Soft line attachment is extremely strong and takes the place of heavy stainless steel shackles.

7. Filament Wound Carbon Foils

Maximized torsional resistance foils save weight forward and aloft where it is critical. Smooth elegant carbon fiber finish is UV resistant.

  • Sculpted torque tube minimizes sail stretch at tack
  • Winch handle adjusts headstay length using self-locking bevel gear screw mechanism
  • Investment-cast stainless steel cover with cast and integrally welded hydraulic tubes
  • Self-align ing lower toggle rotates 90° to accept any chainplate direction

    • Ordering Information
    Unit Wire * Rod ** Headstay length Clevis pin Luff tape
    StandardMax#inmm
    37/16", 1/2"
    11, 12 mm    		-22, 9.53 mm
    -30, 11.10 mm    		75'6"
    23.01 m    		82'6"
    25.15 m    		3/4" (19.10 mm)
    7/8" (22.20 mm)    		66/325
    3.259/16"
    14 mm    		-40, 12.70 mm75'6"
    23.01 m    		89'6"
    27.28 m    		7/8" (22.20 mm)
    1" (25.40 mm)    		66/325
    3.55/8"
    16, 19 mm    		-48, 14.30 mm77'4"
    23.57 m    		95'4"
    29.06 m    		7/8" (22.20 mm)
    1" (25.40 mm), 11/8" (28.60 mm)    		66/325
    47/8"
    22 mm    		-60, 16.80 mm
    -76±, 17.90 mm    		87'11"
    26.80 m    		114'11"
    35.03 m    		11/4" (31.80 mm)66/325
    4.51"
    25 mm    		-76, 17.9 mm
    -91, 19.50 mm, -115, 22.20 mm    		102'7"
    31.27m    		126'7"
    38.58 m    		11/4" (31.80 mm)
    13/8" (34.90 mm), 19/16" (39.70 mm)    		66/325

    * - Sizes do not apply to Dyform® wire
    ** - Contact Harken if other than Nitronic® 50 rod
    ± - Continuous rod only. If sectional order 4.5

    Furling Dimensions
    UnitABCDEFGHIJ
    3*341/2"
    876 mm    		241/8"
    613 mm    		205/8"
    524 mm    		91/2"
    241 mm    		103/4"
    273 mm    		12"
    305 mm    		71/4"
    184 mm    		75/8"
    200 mm    		73/4"
    197 mm    		12"
    305 mm
    3.25*35"
    889 mm    		245/8"
    625 mm    		211/8"
    537 mm    		10"
    254 mm    		111/4"
    286 mm    		121/2"
    318 mm    		73/4"
    197 mm    		75/8"
    200 mm    		73/4"
    197 mm    		12"
    305 mm
    3.5*373/4"
    959 mm    		25"
    635 mm    		211/2"
    546 mm    		103/8"
    264 mm    		115/8"
    295 mm    		127/8"
    327 mm    		75/16"
    194 mm    		711/16"
    195 mm    		93/16"
    233 mm    		133/16"
    335 mm
    4471/4"
    1200 mm    		313/8"
    797 mm    		271/4"
    692 mm    		14"
    357 mm    		15"
    381 mm    		17"
    432 mm    		81/2"
    216 mm    		95/8"
    244 mm    		105/8"
    270 mm    		151/4"
    387 mm
    4.5*485/8"
    1235 mm    		321/2"
    826 mm    		281/4"
    718 mm    		147/8"
    378 mm    		157/8"
    403 mm    		177/8"
    454 mm    		81/2"
    216 mm    		95/8"
    244 mm    		14"
    356 mm    		181/8"
    460 mm

    Foil Dimensions
    UnitKLFoil lengthLuff tape
    311/4"
    33 mm    		111/16"
    43 mm    		7'
    2.13 m    		#6
    6/32" (5 mm)
    3.2511/4"
    33 mm    		111/16"
    43 mm    		7'
    2.13 m    		#6
    6/32" (5 mm)
    3.519/16"
    40 mm    		115/16"
    49 mm    		9'
    2.74 m    		#6
    6/32" (5 mm)
    4115/16"
    50 mm    		27/16"
    61 mm    		9'
    2.74 m    		#6
    6/32" (5 mm)
    4.5*211/16"
    68 mm    		33/16"
    81 mm    		12'
    3.66 m    		#6
    6/32" (5 mm)

    Unit 3

    Wire (1 x 19 SS)Rod Clevis Pin
    7/16", 1/2" (11,12 mm)-22, 9.53 mm, -30, 11.10 mm3/4", 7/8" (19, 22.2mm)
    HeadStay Length Standard 75'6" (23.01 m); max 82'6" (25.15 m)
    Part No.Description
    1027Furling system with Sta-Lok®/Norseman® terminal
    1028Furling system for rod terminal (specify Navtec® or Riggarna®)
    958Extra 7' (2.13 m) luff foil extrusion
    960Extra 10" (254 mm) connector*
    997Extra 10" (254 mm) connector* for -22 rod

    * - 0rder one for each foil extrusion Max Dyform® size 7/16" or 12 mm; requires special terminal

    Unit 3.25

    Wire (1 x 19 SS)Rod Clevis Pin
    9/16" (14 mm)-40, 12.70 mm7/8", 1" (22.2, 25.40 mm)
    HeadStay Length Standard 75'6" (23.01 m); max 89'6" (27.28 m)
    Part No.Description
    1044Furling system with Sta-Lok®/Norseman® terminal
    1045Furling system for rod terminal (specify Navtec® or Riggarna®)
    958Extra 7' (2.13 m) luff foil extrusion
    1032Extra 10" (254 mm) connector*
    960Extra 10" (254 mm) connector* for rod and 1/2" (12 mm) Dyform®

    * - 0rder one for each foil extrusion Max Dyform® size 1/2" or 12 mm; requires special terminal

    Unit 3.5

    Wire (1 x 19 SS)Rod Clevis Pin
    5/8" (16, 19 mm)-48, 14.30 mm7/8", 1", 11/8" (22.2, 25.40, 28.60 mm)
    HeadStay Length Standard 77'4" (23.57 m); max 95'4" (29.06 m)
    Part No. Description
    1063Furling system with Sta-Lok®/Norseman® terminal
    1064Furling system for rod terminal (specify Navtec® or Riggarna®)
    1079Extra 9' (2.74 m) foil extrusion
    1066Extra 10" (254 mm) connector*

    * - 0rder one for each foil extrusion Max Dyform® size 9/16" or 14 mm; requires special termina

    Unit 4

    Wire (1 x 19 SS)Rod Clevis Pin
    7/8" (22 mm)-60, -76 (16.80, 17.90 mm)11/4" (31.80 mm)
    HeadStay Length Standard 87'11" (26.80 m); max 114'11" (35.03 m)
    Part No.Description
    1067Furling system with Sta-Lok®/Norseman® terminal
    1068Furling system for rod terminal (specify Navtec® or Riggarna®). If rod is sectional order 4.5.
    1086Extra 9' (2.74 m) foil extrusion
    1069Extra 12" (305 mm) connector*

    * - 0rder one for each foil extrusion Max Dyform® size 3/4" or 19 mm requires special terminal

    Unit 4.5

    Wire (1 x 19 SS)Rod Clevis Pin
    1" (25 mm)-76, -91, -115 (17.90, 19.50, 22.20 mm)11/4", 13/8", 19/16" (31.80, 34.90, 39.70 mm)
    HeadStay Length Standard 102'7" (31 .27 m); max 126'7" (38.58 m)
    Part No.Description
    1072Furling system with Sta-Lok®/Norseman® terminal
    1073Furling system for rod terminal (specify Navtec® or Riggarna®)
    1050Extra 12' (3.66 m) foil extrusion
    1051Extra 131/2" (343 mm) connector*

    * - 0rder one for each foil extrusion

    Unit 3C

    Rod Clevis Pin
    -22, -30 (9.5, 11.1 mm)3/4", 7/8" (19.1, 22.2 mm)
    HeadStay Length Standard 75'9" (23 m); max 83' (25.3 m)
    Part No.Description
    1129Carbon furling system — specify rod and clevis pin
    Optional Parts
    11257.25' (2.21 m) Carbon foil/connector kit

    Unit 3.25C

    Rod Clevis Pin
    -40 (12.7 mm)7/8", 1" (22.2, 25.4 mm)
    HeadStay Length Standard 75'10" (23.1 m); max 90'4" (27.5 m)
    Part No.Description
    1130Carbon furling system — specify rod and clevis pin
    Optional Parts
    11257.25' (2.21 m) Carbon foil/connector kit

    Unit 3.5C

    Rod Clevis Pin
    -48 (14.3 mm)7/8", 1", 1 1/8" (22.2, 25.4, 28.6 mm)
    HeadStay Length Standard 76'2" (23.2 m); max 97'11" (29.8 m)
    Part No.Description
    1131Carbon furling system — specify rod and clevis pin
    Optional Parts
    11267.25' (2.21 m) Carbon foil/connector kit

    Unit 4C

    Rod Clevis Pin
    -60, -76 (16.8, 17.9 mm)*1/4" (31.8 mm)
    HeadStay Length Standard 91'7" (27.9 m); max 113'4" (34.5 m)
    Part No.Description
    1132Carbon furling system — specify rod and clevis pin
    Optional Parts
    11277.25' (2.21 m) Carbon foil/connector kit

    * - Continuous rod only. If rod is sectional, order 4.5

    Unit 4.5C

    Rod Clevis Pin
    -76, -91, -115 (17.9, 19.5, 22.2 mm)11/4", 13/8", 19/16" (31.8, 34.9, 39.7 mm)
    HeadStay Length Standard 106'4" (32.4 m); max 128' (39 m)
    Part No.Description
    1133Carbon furling system — specify rod and clevis pin
    Optional Parts
    11287.25' (2.21 m) Carbon foil/connector kit

    Small Boat Furling | Spinnaker Staysail & Gennaker | Code Zero Furling | Unit 00AL Jib Reefing & Furling | MKIII Jib Reefing and Furling | How To Size Furling Units | Carbon Reefing & Furling Systems | MKIII Hydraulic Jib Reefing and Furling | Furling Accessories

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