{"title":"Harken MKIV Ocean Jib Reefing \u0026 Furling Unit 3 — Installation Manual","description":"\u003clink rel=\"stylesheet\" href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0879\/4908\/2930\/files\/om-manual-v1.css?v=1790893904\"\u003e\u003cdiv class=\"mpom\"\u003e\n\u003cdiv class=\"om-head\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"om-tag\"\u003eINSTALLATION MANUAL\u003c\/span\u003e\u003cp class=\"om-lead\"\u003eThe original Harken installation manual for the MKIV Ocean Jib Reefing \u0026amp; Furling Unit 3, with every part in it that we carry, matched by Harken part number.\u003c\/p\u003e\n\u003cdiv class=\"om-box\"\u003e\n\u003cdiv class=\"om-doc\"\u003e\n\u003cdiv\u003e\n\u003cb\u003eInstallation Manual\u003c\/b\u003e\u003csmall\u003ePDF · 32 pages · 3.9 MB\u003c\/small\u003e\n\u003c\/div\u003e\n\u003ca class=\"om-btn dl\" href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0879\/4908\/2930\/files\/Harken-MKIV-Ocean-Jib-Reefing-Furling-Unit-3-Installation-Manual.pdf\" target=\"_blank\" rel=\"noopener\"\u003eDownload PDF\u003c\/a\u003e\n\u003c\/div\u003e\n\u003ca class=\"om-btn buy\" href=\"\/products\/harh-45413\"\u003eBuy\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"om-img\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0879\/4908\/2930\/files\/HARH-45413.jpg?v=1747147932\" alt=\"MKIV Ocean Jib Reefing \u0026amp; Furling Unit 3\" loading=\"lazy\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2 class=\"om-h\"\u003eParts in this Manual We Carry\u003c\/h2\u003e\n\u003cp\u003eHarken part numbers as printed in the installation manual, matched to the genuine parts in our store.\u003c\/p\u003e\n\u003cdiv class=\"om-tbl\"\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eHarken part no.\u003c\/th\u003e\n\u003cth\u003eOur part\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e7513.31\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/har751331\"\u003eExtrusion Connector Set w\/ Bushings \u0026amp; Screws for MKIV Ocean Unit 3 Furlers\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHFS1060\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/harhfs1060\"\u003eDrum Top Cover \u0026amp; Bottom Flange Screws (M5 x 12mm) for MKIV Unit 2 \/ Unit 3 Furlers\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHFS1127\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/harhfs1127\"\u003eExtrusion Trim Cap Screw (Unit) for MKIV \u0026amp; MKIV Underdeck Unit 2 \/ Unit 3 Furlers\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e7304\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/har7304\"\u003eHalyard Deflector for MKIV Unit 3 Furlers\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2660\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/har2660\"\u003eBlock - Carbo 75mm Single - Swivel\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2600\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/har2600\"\u003eBlock - Carbo 57mm Single - Swivel\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2670\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/har2670\"\u003eBlock - Carbo Power3 Switchable 75mm Single - Swivel \/ Standard Grip (Black)\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e7402\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/har7402\"\u003eStanchion Mounts - 57.0 mm Ratchet Block\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eH-45413\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/harh-45413\"\u003eDrum Bottom Flange Assembly 1\/2 for MKIV Unit 3 Furlers\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHFS1091\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/harhfs1091\"\u003eDrum Top Cover \u0026amp; Bottom Flange Screws (M5 x 16mm) for MKIV Unit 3 \/ Unit 4 Furlers\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHFS1168\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/harhfs1168\"\u003eDrum Guard Screw (M10 x 65mm) for MKIV Unit 3 Furlers\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2124\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/har2124\"\u003eBow Shackle - Pin Dia: 13\/32 in (10.0 mm)\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eH-38168\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/harh-38168\"\u003eTack Swivel Hub Ball Plugs for MKIV Unit 3 Furlers\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eH-42583\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/harh-42583\"\u003eCross Pin (3\/4\" x 4.15\") for Unit 2 MKIV Furler\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eH-42584\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/harh-42584\"\u003eCross Pin (7\/8\" x 4.15\") for Unit 2 MKIV Furler\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eH-42585\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/harh-42585\"\u003eLink Plate Isolator for MKIV Unit 3 Furlers\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHFS203\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/harhfs203\"\u003eCotter Pin (5\/32\" x 1.25\") for Unit 2 ESP Furlers\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHFS991\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/harhfs991\"\u003eToggle Nylon Nut for MKIV Unit 3 Furlers\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHFS903\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/harhfs903\"\u003eToggle Socket Head Cap Screw for MKIV Unit 3 Furlers\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHFS181\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/harhfs181\"\u003eCotter Pin (3\/32\" x 0.75\") for Unit 0 MKIV Furler\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHFG640\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/harhfg640\"\u003eHex Allen Keys (4mm) for MKIV Unit 0 \/ Unit 1 \/ Unit 2 Furlers\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e7303\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/har7303\"\u003eHalyard Deflector for MKIV Unit 2 Furlers\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003cp class=\"om-note\"\u003eNeed a part that isn't listed? \u003ca href=\"\/pages\/contact\"\u003eAsk us to source it\u003c\/a\u003e and quote the part number from the PDF.\u003c\/p\u003e\n\u003ch2 class=\"om-h\" id=\"om-products\"\u003eProducts in this Manual\u003c\/h2\u003e\n\u003c\/div\u003e","products":[{"product_id":"harhfs181","title":"Harken Cotter Pin (3\/32\" x 0.75\") for Unit 0 MKIV Furler","description":"\u003cp\u003eHarken Spare: Fastener 3\/32 X 3\/4 18-8 SS Cotter Pin PaSSivated\u003c\/p\u003e\u003cp\u003e Our Part # HARHFS181 | Harken Part # HFS181\u003c\/p\u003e","brand":"Harken","offers":[{"title":"Default Title","offer_id":49347411673394,"sku":"HARHFS181","price":0.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0879\/4908\/2930\/files\/HARHFS181.jpg?v=1728039804"},{"product_id":"harhfs1127","title":"Harken Extrusion Trim Cap Screw (Unit) for MKIV \u0026 MKIV Underdeck Unit 2 \/ Unit 3 Furlers","description":"\u003cp\u003eHarken Spare: Trim Cap Screw MKIV Unit 2,2E \u0026amp; Underdeck Unit 2,3\u003c\/p\u003e\u003cp\u003e Our Part # HARHFS1127 | Harken Part # HFS1127\u003c\/p\u003e","brand":"Harken","offers":[{"title":"Default Title","offer_id":49347414065458,"sku":"HARHFS1127","price":0.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0879\/4908\/2930\/files\/HARHFS1127.jpg?v=1728055379"},{"product_id":"harhfs203","title":"Harken Cotter Pin (5\/32\" x 1.25\") for Unit 2 ESP Furlers","description":"\u003cp\u003eHarken Spare: Fastener 5\/32 X 1-1\/4 18-8 SS Cotter Pin PaSSivated\u003c\/p\u003e\u003cp\u003e Our Part # HARHFS203 | Harken Part # HFS203\u003c\/p\u003e","brand":"Harken","offers":[{"title":"Default Title","offer_id":49347435790642,"sku":"HARHFS203","price":0.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0879\/4908\/2930\/files\/HARHFS203.jpg?v=1728023859"},{"product_id":"harhfs903","title":"Harken Toggle Socket Head Cap Screw for MKIV Unit 3 Furlers","description":"\u003cp\u003eHarken Spare: Socket head cap screw MKIV Unit 3\u003c\/p\u003e\u003cp\u003e Our Part # HARHFS903 | Harken Part # HFS903\u003c\/p\u003e","brand":"Harken","offers":[{"title":"Default Title","offer_id":49347462431026,"sku":"HARHFS903","price":1.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0879\/4908\/2930\/files\/HARHFS903.jpg?v=1728016188"},{"product_id":"harhfs991","title":"Harken Toggle Nylon Nut for MKIV Unit 3 Furlers","description":"\u003cp\u003eHarken Spare: Nylon locking nut MKIV Unit 3\u003c\/p\u003e\u003cp\u003e Our Part # HARHFS991 | Harken Part # HFS991\u003c\/p\u003e","brand":"Harken","offers":[{"title":"Default Title","offer_id":49347493298482,"sku":"HARHFS991","price":3.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0879\/4908\/2930\/files\/HARHFS991.jpg?v=1728058834"},{"product_id":"harhfs1168","title":"Harken Drum Guard Screw (M10 x 65mm) for MKIV Unit 3 Furlers","description":"\u003cp\u003eHarken Spare: Guard screw (M10 X 65 mm FH) MKIV Unit 3\u003c\/p\u003e\u003cp\u003e Our Part # HARHFS1168 | Harken Part # HFS1168\u003c\/p\u003e","brand":"Harken","offers":[{"title":"Default Title","offer_id":49347499819314,"sku":"HARHFS1168","price":3.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0879\/4908\/2930\/files\/HARHFS1168.jpg?v=1728029653"},{"product_id":"har2124","title":"Harken Bow Shackle - Pin Dia: 13\/32 in (10.0 mm)","description":"\u003cp\u003eForged stainless steel shackles are polished to a high luster and are stamped with the screw pin diameter. Bow shackles are best for multidirectional loads. Their large interior opening allows plenty of articulation especially when attached to a round bail.\u003c\/p\u003e\u003cp\u003e Our Part # HAR2124 | Mfr. Part # 2124\u003c\/p\u003e","brand":"Harken","offers":[{"title":"Default Title","offer_id":50016291520818,"sku":"HAR2124","price":35.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0879\/4908\/2930\/files\/HAR2124.jpg?v=1747147732"},{"product_id":"har2600","title":"Harken Block - Carbo 57mm Single - Swivel","description":"\u003cp\u003eThe Carbo 57mm Single - Swivel #2600 is a strong block that's perfect for sailors who need reliable and lightweight hardware. It's part of the Carbo Air blocks range, known for their durability and efficient performance. This block is designed to make trimming easy and safe without adding unnecessary weight to your vessel.\u003c\/p\u003e \u003cp\u003e\u003cb\u003eBenefits\u003c\/b\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003eLightweight and durable construction\u003c\/li\u003e \u003cli\u003eHigh working loads for safety\u003c\/li\u003e \u003cli\u003eLow-friction design for easy trimming\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eConstructed from strong, lightweight materials, this block features a 57mm sheave designed to handle high loads. It's compatible with a wide range of sailing gear, ensuring versatility on different types of boats. Ideal for use in situations where both weight and performance are critical, it measures compactly to fit snugly into your setup without compromising on strength.\u003c\/p\u003e \u003cp\u003e\u003cb\u003eUsage\u003c\/b\u003e\u003c\/p\u003e \u003cp\u003ePerfect for both racing and cruising, use this block for applications where smooth line handling and longevity are essential.\u003c\/p\u003e","brand":"Harken","offers":[{"title":"Default Title","offer_id":50016294961458,"sku":"HAR2600","price":55.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0879\/4908\/2930\/files\/HAR2600.jpg?v=1747147741"},{"product_id":"har2660","title":"Harken Block - Carbo 75mm Single - Swivel","description":"\u003cp\u003eThe Harken Block - Carbo 75mm Single - Swivel #2660 is your go-to for smooth, effortless sailing. It's all about reliability and ease, making your trimming tasks a breeze without breaking the bank. You’ll appreciate how this harken block combines lightweight strength with high load capacity, ensuring a safe sailing experience.\u003c\/p\u003e \u003cp\u003e\u003cb\u003eBenefits\u003c\/b\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003eLightweight and compact design.\u003c\/li\u003e \u003cli\u003eHigh working load capacity for increased safety.\u003c\/li\u003e \u003cli\u003eLow-friction swivel functionality for easy trimming.\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eCrafted with advanced Carbo material, this block is both durable and feather-light, perfect for sailors who need dependable gear. The 75mm size makes it versatile for various applications, while maintaining compatibility with a wide range of sailing equipment. Designed to withstand the rigors of the sea, its low-friction mechanism ensures smooth operation and long-term performance.\u003c\/p\u003e","brand":"Harken","offers":[{"title":"Default Title","offer_id":50016296993074,"sku":"HAR2660","price":98.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0879\/4908\/2930\/files\/HAR2660.jpg?v=1747147749"},{"product_id":"har2670","title":"Harken Block - Carbo Power3 Switchable 75mm Single - Swivel \/ Standard Grip (Black)","description":"\u003cp\u003eThe Carbo Power3 Switchable 75mm Single - Swivel \/ Standard Grip (Black) #2670 is perfect for sailors who need reliable line control. It's designed to help you hold loaded lines comfortably, offering an excellent balance between grip and ease of release. This harken block is a trusty companion for sailing enthusiasts looking for quality and performance.\u003c\/p\u003e \u003cp\u003e\u003cb\u003eBenefits\u003c\/b\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003eSwitchable ratchet system for adjustable holding power\u003c\/li\u003e \u003cli\u003eSwivel feature for optimal line alignment\u003c\/li\u003e \u003cli\u003eStandard grip ensures comfort during use\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eMade from durable composite materials, this block features a 75mm sheave diameter. It's compatible with a variety of line sizes and is designed for easy integration into your existing sailing setup. Engineered to withstand the tough marine environment, it ensures longevity and consistent performance.\u003c\/p\u003e \u003cp\u003e\u003cb\u003eUsage\u003c\/b\u003e\u003c\/p\u003e \u003cp\u003eIdeal for use in dinghy and small keelboat applications where precise line handling is crucial.\u003c\/p\u003e","brand":"Harken","offers":[{"title":"Default Title","offer_id":50016297386290,"sku":"HAR2670","price":104.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0879\/4908\/2930\/files\/HAR2670.jpg?v=1747147749"},{"product_id":"har7304","title":"Harken Halyard Deflector for MKIV Unit 3 Furlers","description":"\u003cp\u003eThe halyard deflector prevents the jib halyard and other halyards (such as a spinnaker or additional jib halyards) from wrapping around the foil.\u003c\/p\u003e\u003cp\u003eUse with furling unit: 7323.10, 7413.10, 7413.11 3\/4, 7413.11 7\/8\u003c\/p\u003e\u003cp\u003e Our Part # HAR7304 | Mfr. Part # 7304\u003c\/p\u003e","brand":"Harken","offers":[{"title":"Default Title","offer_id":50016335790386,"sku":"HAR7304","price":85.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0879\/4908\/2930\/files\/HAR7304.jpg?v=1747147873"},{"product_id":"har7303","title":"Harken Halyard Deflector for MKIV Unit 2 Furlers","description":"\u003cp\u003eThe halyard deflector prevents the jib halyard and other halyards (such as a spinnaker or additional jib halyards) from wrapping around the foil.\u003c\/p\u003e\u003cp\u003eUse with furling unit: 7322.10, 7412.10, 7412.11 5\/8\u003c\/p\u003e\u003cp\u003e Our Part # HAR7303 | Mfr. Part # 7303\u003c\/p\u003e","brand":"Harken","offers":[{"title":"Default Title","offer_id":50016335855922,"sku":"HAR7303","price":73.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0879\/4908\/2930\/files\/HAR7303.jpg?v=1747147874"},{"product_id":"har7402","title":"Harken Stanchion Mounts - 57.0 mm Ratchet Block","description":"\u003cp\u003eThe 57.0 mm Ratchet Block #7402 is designed to help sailors achieve smooth and effortless furling from the cockpit. Its ball and socket base ensures that the block aligns perfectly for optimal performance. This piece of gear is all about making sailing a little easier without any fuss.\u003c\/p\u003e \u003cp\u003e\u003cb\u003eBenefits\u003c\/b\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003eReliable tension maintenance for smooth furling\u003c\/li\u003e \u003cli\u003eBall and socket base for precise alignment\u003c\/li\u003e \u003cli\u003eDurable construction for long-lasting use\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eConstructed from high-quality materials, the 57.0 mm Ratchet Block is built to withstand the rigors of sailing. Its compact design ensures compatibility with various systems, making it a versatile addition to any setup. 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