{"product_id":"harken-57mm-carbo-quad-swivel-block-2631-for-sailboat-line-control","title":"Harken 57mm Carbo Quad Swivel Block 2631 for Sailboat Line Control","description":"\u003cp\u003e\u003cstrong\u003e57mm Carbo Quad Block - Swivel\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eLow-friction Carbo Air blocks are lightweight, strong, reliableand affordable. Companions to our popular Harken Big Boat blocks, these small, compact blocks have very high working loads for safe, easy trimming.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eSheave  (mm) 57 mm\u003c\/li\u003e\n\u003cli\u003eSheave  (in) 2 1\/4 in\u003c\/li\u003e\n\u003cli\u003eMaximum line  (mm) 10 mm\u003c\/li\u003e\n\u003cli\u003eMaximum line  (in) 3\/8 in\u003c\/li\u003e\n\u003cli\u003eMaximum working load (kg) 1080 kg\u003c\/li\u003e\n\u003cli\u003eMaximum working load (lb) 2380 lb\u003c\/li\u003e\n\u003c\/ul\u003e \u003c!--- cis2:m2lsl5xp ---\u003e\n\u003cp\u003e\u003cstrong\u003eHarken 57mm Carbo Quad Block - Swivel, Part Number 2631\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe Harken 57mm Carbo Quad Swivel Block is a lightweight, low-friction sailing block designed for reliable line handling and trimming on sailboats. Its compact Carbo Air construction combines strength with a high maximum working load, making it suitable for sailors who need smooth, controlled adjustment in a space-conscious setup. As a companion to Harken Big Boat blocks, this quad block provides practical performance for a range of onboard trimming applications.\u003c\/p\u003e\u003cp\u003eWith four sheaves and a swivel configuration, the Harken Carbo Quad Block helps organize and redirect sailing lines while allowing the block to align with changing line angles. The low-friction design supports easier trimming, and the compact format makes it useful for equipment layouts where efficient line control matters. It accommodates line up to 3\/8 inch and has a maximum working load of 2,380 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow-friction Carbo Air design:\u003c\/strong\u003e Supports smooth, easy line trimming for sailing applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuad sheave configuration:\u003c\/strong\u003e Provides four sheaves for versatile line routing and control.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSwivel block design:\u003c\/strong\u003e Allows the block to orient with the line direction during use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLightweight and compact construction:\u003c\/strong\u003e Helps provide practical performance where onboard space and equipment weight matter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh working load:\u003c\/strong\u003e Handles a maximum working load of 2,380 pounds for demanding trimming applications.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eProduct Details:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Harken\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart number:\u003c\/strong\u003e 2631\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct type:\u003c\/strong\u003e 57mm Carbo Quad Block - Swivel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSheave diameter:\u003c\/strong\u003e 2 1\/4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum line size:\u003c\/strong\u003e 3\/8 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum working load:\u003c\/strong\u003e 2,380 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSheave quantity:\u003c\/strong\u003e Four\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eChoose the Harken 57mm Carbo Quad Swivel Block 2631 for compact, reliable, and smooth line control on your sailboat.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSEO Meta Description:\u003c\/strong\u003e Shop the Harken 57mm Carbo Quad Swivel Block 2631 for low-friction sailboat line control, four sheaves, and a 2,380-pound working load.\u003c\/p\u003e\u003cstyle\u003etable.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; }\u003c\/style\u003e\n\u003ctable class=\"productattributes\"\u003e\n\u003cthead\u003e\u003ctr\u003e\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\u003ctd\u003eTruck Freight: No\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eOversized: No\u003c\/td\u003e\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cbr\u003e","brand":"Harken","offers":[{"title":"Default Title","offer_id":44937053503577,"sku":"88766","price":213.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0623\/1818\/2489\/files\/88766XL.jpg?v=1789836988","url":"https:\/\/www.marinepartsonly.com\/products\/harken-57mm-carbo-quad-swivel-block-2631-for-sailboat-line-control","provider":"Marine Parts Only","version":"1.0","type":"link"}