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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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Top & Bottom Cover 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
Top & Bottom Cover Assembly HFG683 Top Cover Assembly w/Screws 1
H-38817 Top Cover
Special Order 		2
HFS980 Top Cover Screw (M4 x .7 x 10MM) 2
HFG684 Bottom Flange Assembly w/Screws 1
H-38818 Flange 2
HFS980 Bottom Flange Screw (M4 x .7 x 10MM) 2



Guard 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
Guard Assembly HFG685 Guard Assembly 1
H-38293 Guard Set
Special Order 		2
HFS1052 Guard Screw (M6 x 1 x 40MM SHCS) 2



Torque Tube 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 Image Ref. Part N° Description Quantity
Torque Tube Assembly
- HFG927 Torque Tube Assembly
Special Order 		1
1 H-42954 Clamp
Special Order 		1
2 HFS827 Clamp Screw (M5 x .08 x 12MM SHCS) 4



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 Image Ref. Part N° Description Quantity
Hub Assembly - HFG923 Hub Assembly
Special Order 		1
1 HFS203 Cotter Pin (5/32" x 1.250") 4
2 H-42395 Clevis Pin (1/2" x 1.146") 4
3 HFG931 Bearing Cap w/Insert
Special Order 		2
A AL-8101 Bearing Cap
Special Order 		1
B H-43838 IGUS Bushing
Special Order 		1
4 HFS334 Socket Head Cap Screws (M5 x 8 x 10MM)
Special Order 		4
- H-35144A Ball Plug 5
- MP-129 Torlon Ball Bearing (5/16")
Special Order 		28
- MP-118 Delrin Ball Bearing (5/16")
Special Order 		134
5 H-42461 Deck Flange
Special Order 		1



Rod Adapter Stud

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 Image Ref. Part N° Description Quantity
Rod Adapter Stud - 7422-8 Rod Adapter Stud (-8) w/Nosepiece 1
1 H-41536 Stud (Main Body)
Special Order 		1
2 H-41534 Nosepiece (-8)
Special Order 		1
3 HFG193 Cotter Pin (3/32" x 1")
Special Order 		2
- 7423-10 Rod Adapter Stud (-10) w/Nosepiece 1
1 H-41536 Stud (Main Body)
Special Order 		1
2 H-41535 Nosepiece (-10)
Special Order 		1
3 HFG193 Cotter Pin (3/32" x 1")
Special Order 		2



Foils & Connectors w/Bushings

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 w/Bushings HFG680 Trim Cap Set w/o Screws 1
HFG629 Trim Cap Screw Set 1
HFS1126 Trim Cap Screw 3
H-39812 Halyard Swivel w/o Shackles 1
MP-129 Torlon Ball Bearings
Special Order 		96
H-36125A Clip/Smalley Ring
Special Order 		2
7411.FOILSET.BLACK Foil Set, Black
Special Order 		-
7411.30.BLACK Foil (7/2.13 m) Luff, Black Anodized
Special Order 		6
7411.33.BLACK Foil (2/610 mm) Bottom, Black Anodized
Special Order 		1
7411.FOILSET.CLEAR Foil Set, Clear (Special Order)
Special Order 		-
7411.30.CLEAR Foil (7/2.13 m) Luff, Clear Anodized
Special Order 		6
7411.33.CLEAR Foil (2/610 mm) Bottom, Clear Anodized
Special Order 		1
HFG343 Foil Screw Set 1
HFS1105 Foil Screw 30
HFG625 Connector Set w/o Bushings 1
HFG295 Connector Bushing Set 1
H-42062 Connector Bushing (Curved/Longer) 12
H-42063 Connector Bushing (Flat/Shorter) 12
7411.31 Connector w/Bushings, Foil Screws, and Wedges 1
7411.32 Connector w/Bushings Bottom 1
HFG299 Connector Wedge Set 1
H-39625 Connector Wedge 14
H-39683 Feeder Set 1
H-35623B Feeder
Special Order 		1
HFS1129 Feeder Screw 1
H-35666A 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 4656 Instruction Manual
Special Order 		1
947 Prefeeder 1
833 Loctite Blue
Special Order 		1
HFG739 Loctite Red
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 		-
Hex Keys
HFG643 5 mm
Special Order 		1
HFG640 4 mm 1
HCP1387 2.5 mm 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
Additional Lead Blocks
349 29 mm Carbo Stand-Up Fixed 1
131 Big Bullet Thru-Deck 1
2110 Shackle (6 mm) 3
945 Halyard Restrainer 1
945ASSY Sheave/SS Inner Race Only
Special Order 		1
SP-038 Clevis Pin (5/16" x 1/4")
Special Order 		1
HCP394 Bracket-Large
Special Order 		1
HFS181 Cotter Pin (3/32" x 3/4") 1
7302 Halyard Deflector 1


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