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MKIV Jib Reefing & Furling Systems

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MKIV Jib Reefing & Furling Systems

Designed for performance racing and cruising sailors, MKIV furling systems are strong, lightweight and aerodynamic, with the performance and features Harken® is known for. Longevity, ease of use and simplicity of installation are crucial components of the design. These free-rolling furlers make all the difference in headsail control by allowing racers and cruisers to quickly furl and reef from the safety of the cockpit, while maintaining great sail shape and optimal speed.

Aluminum line guard, torque tube and swivels are deep-saturation Hardkote anodized for strength and durability, with a black additive for no-fade UV-stabilization and corrosion protection. The line guard is also powder coated for added corrosion resistance. The drum cap is engineered from tough polymer resin.

Systems feature free-rolling ball bearings, computer-designed stacked bearing races and large-diameter drums for smooth reefing and furling. A free-spinning, high-strength halyard swivel reduces weight aloft to minimize pitching and heeling. The double foil grooves allow fast hoists, douses, and sail changes—ideal for club racing.

MKIV jib reefing and furling systems are designed for owner installation. Seven-year limited warranty.



MKIV Jib Reefing & Furling System, Unit 0

MKIV Jib Reefing & Furling System, Unit 0

MKIV Unit 0 Jib Furler
Typical Boat Length: 22' - 30' (6.5m - 9.1m)
Wire Diameter: 3/16" & 7/32" (5mm & 6mm)
Rod Diameter: -4, 4.37mm, -6, 5.03mm
Clevis Pin Diameter: 3/8", 7/16" (9.5mm, 11.1mm)

Headstay Length: Standard - 38'7" (11.77m); Max - 45'7" (13.9m)
Part Number Description
H741010 Furling System
Toggle Assembly Required - Sold Separately
H74102038 Toggle Assembly with 3/8" (9.5mm) Clevis Pin
H741020716 Toggle Assembly with 3/8" (9.5mm) Clevis Pin
Optional Parts
H741030 Extra 7' (2.13m) Luff Foil Extrusion
H741031 Extra 6-1/2" (165mm) Connector
H742004 -4 Rod Adaptor Stud **
H742106 -6 Rod Adaptor Stud **
H884 Snap Shackle for Tack or Head (Each Shackle)
H944 Halyard Restrainer (Use Only When Required)
H7401 40mm Carbo Block Stanchion Lead Block Assembly
H7402 57mm Carbo Ratchet Block Stanchion Lead Block Assembly
H7403 29mm Outboard Stanchion Lead Block Assembly
H7404 Lead Block Kit: 3 x H7403/1 x H7402/1 x H7401/1 Cleat
** Use with Conventional Turnbuckle


H7401 40mm Carbo Block Stachion Lead Assy Price: $39.60 H7402 57mm Carbo Ratchet Stachion Lead Assy Price: $73.60
H7403 29mm Outboard Stachion Lead Block Assy Price: $37.60 H7404 Stanchion Lead Block Kit Price: $241.60
H741010 MKIV Unit 0 Jib Furling System Price: $1,670.40 H74102038 Toggle Assembly with 3/8" Clevis Pin Price: $56.00
H741020716 Toggle Assembly with 7/16" Clevis Pin Price: $56.00 H741030 Extra 7' Luff Foil Extrusion Price: $64.80
H741031 Extra 6-1/2" Connector Price: $27.20 H742004 -4 Rod Adaptor Stud Price: $197.35
H742106 -6 Rod Adaptor Stud Price: $197.35 H884 Snap Shackle for Tack/Head Price: $70.84
H944 Halyard Restrainer Price: $56.76


MKIV Jib Reefing & Furling System, Unit 1

MKIV Jib Reefing & Furling System, Unit 1

MKIV Unit 1 Jib Furler
Typical Boat Length: 28' - 36' (8.3m - 11m)
Wire Diameter: 1/4" & 9/32" (6mm, 7mm & 8mm)
Rod Diameter: -8, 5.72mm, -10, 6.35mm
Clevis Pin Diameter: 1/2" (12.7mm)

Headstay Length: Standard - 45'11" (13.99m); Max - 52'11" (16.12m)
Part Number Description
H741110 Furling System
Toggle Assembly Required - sold separately
H74112016 Toggle Assembly with 1/2" (12.7mm) Clevis Pin
Optional Parts
H741130 Extra 7' (2.13m) Luff Foil Extrusion
H741131 Extra 7" (178mm) Connector
H742208 -8 Rod Adaptor Stud **
H742310 -10 Rod Adaptor Stud **
H944 Halyard Restrainer (Use Only When Required)
H7401 40mm Carbo Block Stanchion Lead Block Assembly
H7402 57mm Carbo Ratchet Block Stanchion Lead Block Assembly
H7403 29mm Outboard Stanchion Lead Block Assembly
H7404 Lead Block Kit: 3 x H7403/1 x H7402/1 x H7401/1 Cleat
** Use with Conventional Turnbuckle


H7401 40mm Carbo Block Stachion Lead Assy Price: $39.60 H7402 57mm Carbo Ratchet Stachion Lead Assy Price: $73.60
H7403 29mm Outboard Stachion Lead Block Assy Price: $37.60 H7404 Stanchion Lead Block Kit Price: $241.60
H741110 MKIV Unit 1 Jib Furling System Price: $2,416.80 H74112016 Toggle Assembly with 1/2" Clevis Pin Price: $63.20
H741130 Extra 7' Luff Foil Extrusion Price: $74.80 H741131 Extra 7" Connector Price: $30.40
H742208 -8 Rod Adaptor Stud Price: $202.17 H742310 -10 Rod Adaptor Stud Price: $202.17
H944 Halyard Restrainer Price: $56.76


MKIV Jib Reefing & Furling System, Unit 2

MKIV Jib Reefing & Furling System, Unit 2

MKIV Unit 2 Jib Furler
Typical Boat Length: 35' - 46' (10.6m - 14.2m)
Wire Diameter: 5/16" & 3/8" (8mm & 10mm)
Rod Diameter: -12, 7.14mm, -17, 8.38mm
Clevis Pin Diameter: 5/8" (15.9mm)

Headstay Length: Standard - 60'4" (18.38m); Max - 67'4" (20.51m)
Part Number Description
H741210 Furling System
Toggle Assembly Required - sold separately
H74122020 Toggle Assembly with 5/8" (15.9mm) Clevis Pin
Optional Parts
H741230 Extra 7' (2.13m) Luff Foil Extrusion
H741231 Extra 9" (229mm) Connector
H742312 -12 Rod Adaptor Stud **
H742517 -17 Rod Adaptor Stud **
H885 Snap Shackle for Tack/Head
H944 Halyard Restrainer (Use Only When Required)
H7401 40mm Carbo Block Stanchion Lead Block Assembly
H7402 57mm Carbo Ratchet Block Stanchion Lead Block Assembly
H7403 29mm Outboard Stanchion Lead Block Assembly
H7404 Lead Block Kit: 3 x H7403/1 x H7402/1 x H7401/1 Cleat
** Use with Conventional Turnbuckle


H7401 40mm Carbo Block Stachion Lead Assy Price: $39.60 H7402 57mm Carbo Ratchet Stachion Lead Assy Price: $73.60
H7403 29mm Outboard Stachion Lead Block Assy Price: $37.60 H7404 Stanchion Lead Block Kit Price: $241.60
H741210 MKIV Unit 2 Jib Furling System Price: $3,639.20 H74122020 Toggle Assembly with 5/8" Clevis Pin Price: $67.80
H741230 Extra 7' Luff Foil Extrusion Price: $96.00 H741231 Extra 9" Connector Price: $34.80
H742412 -12 Rod Adaptor Stud Price: $231.01 H742517 -17 Rod Adaptor Stud Price: $231.01
H885 Snap Shackle for Tack/Head Price: $75.52 H945 Halyard Restrainer Price: $74.12


MKIV Jib Reefing & Furling System, Unit 3

MKIV Jib Reefing & Furling System, Unit 3

MKIV Unit 3 Jib Furler
Typical Boat Length: 45' - 60' (13.7m - 18.3m)
Wire Diameter: 7/16" & 1/2" (11mm, 12mm & 14mm)
Rod Diameter: -22, 9.53mm, -30, 11.10mm
Clevis Pin Diameter: 3/4", 7/8" (19.1mm, 22.2mm)

Headstay Length: Standard - 75'1" (22.88m); Max - 82'1" (25.02m)
Part Number Description
H741310 Furling System
Toggle Assembly Required - sold separately
H74122024 Toggle Assembly with 3/4" (19.1mm) Clevis Pin
H74132028 Toggle Assembly with 7/8" (22.2mm) Clevis Pin
Optional Parts
H741330 Extra 7' (2.13m) Luff Foil Extrusion
H741331 Extra 9-3/4" (248mm) Connector
H742622 -22 Rod Adaptor Stud **
H742730 -30 Rod Adaptor Stud **
** Use with Conventional Turnbuckle


H741310 MKIV Unit 3 Jib Furling System Price: $5,478.40 H74132024 Toggle Assembly with 3/4" Clevis Pin Price: $348.96
H74132028 Toggle Assembly with 7/8" Clevis Pin Price: $413.77 H741330 Extra 7' Luff Foil Extrusion Price: $130.48
H741331 Extra 9-3/4" Connector Price: $56.92 H742622 -22 Rod Adaptor Stud Price: $477.92
H742730 -30 Rod Adaptor Stud Price: $486.16

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