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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. The small outside drum diameter lets unit fit inside narrow bows.

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Hub Assembly

Note: Click on your preferred part no. or scroll down to purchase. If it's a Special Order item, click on the part number and request it through the Contact Us form. A customer care agent will follow up shortly.

Exploded View Part N° Description Quantity
Hub Assembly H-42959 Foil clamp
Special Order 		1
HFS1102 Socket head cap screw (M4 X 12 mm) 4
H-52148 Torque tube
Special Order 		1
HFS331 Socket head cap screw (M5 X 8 mm)
Special Order 		3
2110 Bow shackle 6 mm
Special Order 		1
H-52081 Deck plate
Special Order 		1
HCP637 Clevis pin (5/16" X 2.219")
Special Order 		2
HFS181 Cotter pin (.094" X.750") 2
H-52131 Keeper
Special Order 		1
HFS747 Socket head cap screw (M6 X 16 mm) 2
HCP821 Smalley retaining ring (VS-150-S02)
Special Order 		1
H-52061 Ball/guard
Special Order 		1
MP-127 Torlon® ball (3/8")
Special Order 		17
H-52141 Spool
Special Order 		1
H-52720 Bridge
Special Order 		1
237 Bullseye fairlead
Special Order 		1
HFS106 Slotted roundhead screw (10-32 X 1.500°)
Special Order 		2
HFS111 Flatwasher 10 (.032' X.203" X.438')
Special Order 		2
HFS110 Hex nut 10-32
Special Order 		2



Foils & Connectors

Note: Click on your preferred part no. or scroll down to purchase. If it's a Special Order item, click on the part number and request it through the Contact Us form. A customer care agent will follow up shortly.

Exploded View Part N° Description Quantity
Foils & Connectors HFG679 Trim Cap Set w/o Screws 1
HFG629 Trim Cap Screw Set 1
HFS1126 Trim Cap Screw 2
H-39923 Halyard Swivel w/o Shackles 1
HSB17 Torlon Ball Bearings
Special Order 		96
HCP1199 Clip/Smalley Ring
Special Order 		2
7410.10.FOILSET.BLACK Foil Set, Black
Special Order 		-
7410.30.BLACK Foil (7/2.13 m) Luff, Black Anodized
Special Order 		5
7410.33.BLACK Foil (2/610 mm) Bottom, Black Anodized
Special Order 		1
7410.10.FOILSET.CLEAR Foil Set, Clear (Special Order)
Special Order 		-
7410.30.CLEAR Foil (7/2.13 m) Luff, Clear Anodized
Special Order 		5
7410.33.CLEAR Foil (2/610 mm) Bottom, Clear Anodized
Special Order 		1
HFG341 Foil Screw Set 1
HFS1105 Foil Screw 26
HFG599 Connector Set w/o Bushings 1
HFG294 Connector Bushing Set 1
H-42067 Connector Bushing (Curved/Longer) 10
H-42068 Connector Bushing (Flat/Shorter) 10
7410.31 Connector w/Bushings 1
7410.32 Connector w/Bushings Bottom 1
HFG298 Connector Wedge Set 1
H-39625 Connector Wedge 12
H-39713 Feeder Set 1
H-37272B Feeder Screw
Special Order 		1
HFS1128 Feeder Screw 1
H-37282A Tab 1



Additional Accessories

Note: Click on your preferred part no. or scroll down to purchase. If it's a Special Order item, click on the part number and request it through the Contact Us form. A customer care agent will follow up shortly.

Exploded View Part N° Description Quantity
Additional Accessories
4416 Instruction Manual
Special Order 		1
947 Prefeeder 1
HFG739 Red Loctite
Special Order 		2
HFG725 5200 Adhesive Set
Special Order 		1
HFG722 5200 Marine Adhesive Sealant
Special Order 		1
HFG200 Injector
Special Order 		1
HFG201 Injector
Special Order 		1
HFG594 7 mm Single Braid Polyester (55', 16.7 m) 1



Extra Tools

Note: Click on your preferred part no. or scroll down to purchase. If it's a Special Order item, click on the part number and request it through the Contact Us form. A customer care agent will follow up shortly.

Exploded View Part N° Description Quantity
Extra Tools 7404 Lead block kit 1
7403 29 mm outboard lead assembly 3
7402 57 mm Carbo ratchet assembly 1
7401 40 mm Carbo assembly 1
HCP168 Horn cleat
Special Order 		1
2110 Bow shackle (6 mm) 3
944 Halyard restrainer 1
944ASSY Sheave/SS inner race only
Special Order 		1
HFG467 Clevis pin (18-8 mm/ 1/4" x 9") 1
HCP393 Bracket-small
Special Order 		1
HFS118 Cotter pin (18-8 mm/1/16" x 1/2")
Special Order 		1
7301 Halyard deflector 1
Hex Keys
HCP1387 2.5 mm 1
HCP1089 3 mm
Special Order 		1
HFG642 5 mm 1



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