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Engineered for cruising yachts between 6.5 to 9.1 meters (21–30 feet), the Harken Unit 0 MKIV Ocean Jib Furling System delivers precision, reliability, and ease of use in a compact, lightweight design. Whether you're coastal cruising or pushing offshore, this system transforms headsail handling into a smooth, one-person operation.
Crafted from hardcoat-anodized aluminum and fitted with high-load Torlon® ball bearings, the MKIV ensures low-friction furling and reefing without the need for lubrication. Its single-groove foil accommodates a 5 mm luff tape, making sail changes straightforward and efficient. The system includes modular extrusions for easy customization and a robust halyard swivel that maintains consistent sail shape while furling.
With a total weight of just 5.9 kg (13 lbs), it minimizes weight aloft—enhancing boat balance and performance. The MKIV’s clean design and rugged construction make it a trusted companion for sailors who demand control, safety, and durability in every tack.
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| Specification | Metric Value | Imperial Value |
|---|---|---|
| Part Number | 7510.10 | — |
| Boat Length Range | 6.5–9.1 m | 21–30 ft |
| Wire Ø (1x19 SS) | 6 mm | 7/32 in |
| Rod Ø | 5.03 mm | -6 (dash size) |
| Clevis Pin Ø | 11.1 mm | 7/16 in |
| Standard Headstay Length | 11.77 m | 38 ft 7 in |
| Maximum Headstay Length | 13.9 m | 45 ft 7 in |
| Extrusion Length | 2.13 m | 7 ft |
| Luff Tape Size | 5 mm | #6 (6/32 in) |
| Dimension A | 96 mm | 3 3/4 in |
| Dimension B | 150 mm | 5 7/8 in |
| Dimension C | 47 mm | 1 7/8 in |
| Dimension D | 140 mm | 5 1/2 in |
| Dimension E | 66 mm | 2 5/8 in |
| F (Max) | 1041 mm | 41 in |
| F (Min) | 997 mm | 39 1/4 in |
| G (Max) | 213 mm | 8 3/8 in |
| G (Min) | 203 mm | 8 in |
| H (Max) | 186 mm | 7 5/16 in |
| H (Min) | 175 mm | 7 in |
| I (Max) | 59 mm | 2 5/16 in |
| I (Min) | 51 mm | 2 in |
| Material | Hardcoat-anodized aluminum | UV-stabilized |
| Bearings | Torlon® ball bearings | No lubrication required |
| Foil Type | Single groove | — |
This system includes foils, connectors, bushings, sail feeder, upper foil cap, lower drum, halyard swivel, Loctite, Allen keys, and reefing line
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