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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 sailing adventure.

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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 Image Ref. Part N° Description Quantity
DIAGRAM 1 - HARKEN MKIV OCEAN UNIT 0
- HFG990 Hub Assembly
Special Order 		1
1 HFS1337 ↳ Clamp Screw (M8 x 16 mm custom dogpoint SS) 2
2 H-83150 ↳ Cover with threaded insert
Special Order 		2
3 H-35600C ↳ Flange half with threaded insert 2
4 HFS980 ↳ Screws for flange and cover (M4 x 10mm FH SHCS) 4
5 H-35199E.GREY ↳ Guard half
Special Order 		2
6 HFS1052 ↳ Guard Screw (M6 x 40mm SHCS) 2
7 2110 ↳ Shackle 1
8 5356 ↳ Label for guard half
Special Order 		2
9 5359 ↳ Label for tack
Special Order 		1
10 H-36636A ↳ IGUS Crosspin Bushings for hub
Special Order 		1
11 7511.10BASE ↳ Hub
Special Order 		1
12 MP-118 ↳ Delrin Ball Bearings for hub
Special Order 		78
13 H-335144A ↳ Ball Plugs for hub 3



Rod Adapter Stud 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
Rod Adapter Stud Assembly - 7420-4 Rod Adapter Stud (-4) w/Nosepiece 1
1 H-41707 ↳ Stud (Main Body)
Special Order 		1
2 H-41708 ↳ Nosepiece
Special Order 		1
3 HFS181 ↳ Cotter Pin (3/32" x 3/4") 2
- 7421-6 Rod Adapter Stud (-6) w/Nosepiece 1
1 H-41705 ↳ Stud (Main Body)
Special Order 		1
2 H-41706 ↳ Nosepiece
Special Order 		1
3 HFS181 ↳ Cotter Pin (3/32" x 3/4") 2



Eye/Jaw Toggle Reversible

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
Eye/Jaw Toggle Reversible - 7410.20 5/16 Eye/Jaw Toggle Reversible 5/16" (8 mm) Pin 1
1 H-63528 Toggle
Special Order 		1
2 H-42401 Crosspin (1/4" x 2-1/8") 1
3 HFS1108 Nylon Washer 2
4 H-42050 Cross Hole Plug
Special Order 		2
5 SP-039 Clevis Pin (5/16" x .84 Grip)
Special Order 		1
6 HFS181 Cotter Pin (3/32" x 3/4") 1
7 HFS680 Cotter Pin (1/8 x 3/4")
Special Order 		1
- 7410.20 3/8 Eye/Jaw Toggle Reversible 3/8" (9.5 mm) Pin 1
1 H-37687C Toggle
Special Order 		1
2 H-42401 Crosspin (1/4" x 2-1/8") 1
3 HFS1108 Nylon Washer Set 2
4 H-42050 Cross Hole Plug Set
Special Order 		2
5 H-42400 Clevis Pin (3/8" x 7/8") 1
6 HFS181 Cotter Pin (3/32" x 3/4") 2
- 7410.20 7/16 Eye/Jaw Toggle Reversible 7/16" (11.1 mm) Pin 1
1 H-37686C Toggle
Special Order 		1
2 H-42401 Crosspin (1/4" x 2-1/8") 1
3 HFS1108 Nylon Washer Set 2
4 H-42050 Cross Hole Plug Set
Special Order 		2
5 H-42399 ↳ Clevis Pin (7/16" x 1") 1
6 HFS181 ↳ Cotter Pin (3/32" x 3/4") 2



Foil Set & 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 Image Ref. Part N° Description Quantity
DIAGRAM 4 - HARKEN MKIV UNIT 1 1 HFS1127 Trim Cap Screw 6x3/8" Tap (Qty includes 1 extra) 3
2 H-83897 Trim Cap (bottom half)
Special Order 		1
3 H-83896 Trim Cap (top half)
Special Order 		1
4 7510.31F Connector
Special Order 		5
5 H-83887 Connector Bushing (bottom, longer with hook)
Special Order 		5
6 H-83886 Connector Bushing (top half, shorter)
Special Order 		5
7 HFS1379 Foil Screw M3x8mm FH SHCS
Special Order 		22
8 7510.3 Foil 7' (2.13 m) 5
9 HFS1407 Feeder Screw M3x8mm SHCS (Qty includes 1 extra)
Special Order 		5
10 H-83919 Feeder Half
Special Order 		2
11 7510.33F Bottom Foil 2' (610 mm)
Special Order 		1
12 7510.FOILSET Foil set includes (5) 7510.30 and (1) 7510.33F
Special Order 		1



Connector w/Bushings and Foil Screws

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
Connector w/Bushings and Foil Screws 7510.31 Connector w/Bushings and Foil Screws 1
4 7510.31F ↳ Connector
Special Order 		1
5 H-83886 ↳ Connector Bushing (top half, shorter)
Special Order 		1
6 H-83887 ↳ Connector Bushing (bottom, longer w/ hook)
Special Order 		1
7 HFS1379 ↳ Foil Screw
Special Order 		4



Halyard Swivel

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
Halyard Swivel Diagram - HFG993 Halyard Swivel
Special Order		 1
1 H-83857 ↳ Clip/Smalley Ring
Special Order 		1
2 2110 ↳ Shackle 6 mm 2
3 MP-126 ↳ Torlon Ball Bearings
Special Order 		44



Instruction Manual & 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
Instruction Manual & Accessories 5389 Instruction Manual
Special Order 		1
HFG739 Loctite Red
Special Order 		1
833 Loctite Blue
Special Order 		1
HFG594 7 mm Double 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
Foils, Swivel & Connectors
7404 Lead Block Kit (sold separately) 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
944 Halyard Restrainer (sold separately) 1
944ASSY ↳ Sheave/SS Inner Race Only
Special Order 		1
HFG467 ↳ Clevis Pin (1/4" x 9" 18-8) 1
HCP393 ↳ Bracket-Small
Special Order 		1
HFS118 ↳ Cotter Pin (1/16" x 1/2" 18-8) 1
7301 Halyard Deflector (sold separately) 1
- Hex Keys
Special Order 		-
HFG642 ↳ 5 mm Hex Key 1
HCP1089 ↳ 3 mm Hex Key
Special Order 		1
HCP1387 ↳ 2.5 mm Hex Key 1


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