{"product_id":"harken-hsb380-57mm-quad-swivel-block-with-center-becket","title":"Harken HSB380 57mm Quad Swivel Block with Center Becket","description":"\u003cp\u003e\u003cstrong\u003e57mm Quad Block Swivel, Center Becket\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) 7\/16 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 HSB380 57mm Quad Swivel Block with Center Becket\u003c\/strong\u003e is a lightweight, low-friction marine pulley designed for reliable line handling and efficient trimming. Built for sailors who need compact deck hardware with a high working load, this four-sheave block is well suited to sailboat control systems and other applications requiring smooth, dependable purchase.\u003c\/p\u003e\u003cp\u003ePart of the Harken Carbo Air block family, the HSB380 combines a compact design with the strength needed for demanding trimming applications. Its swivel configuration helps the block align with changing line direction, while the center becket provides a convenient attachment point for creating or configuring multi-part purchase systems. The low-friction sheaves support easier line movement, helping make adjustments more manageable during sailing operations.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuad sheave design:\u003c\/strong\u003e Four sheaves support multi-part purchase systems and efficient line handling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSwivel configuration:\u003c\/strong\u003e Allows the block to align with changing line direction for smoother operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCenter becket:\u003c\/strong\u003e Provides an integrated attachment point for purchase and trimming setups.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow-friction Carbo Air construction:\u003c\/strong\u003e Supports smooth line movement in a lightweight, compact block design.\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 HSB380\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlock type:\u003c\/strong\u003e Quad swivel block with center becket\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 7\/16 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum working load:\u003c\/strong\u003e 2,380 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eChoose the Harken HSB380 when your sailboat trimming system calls for a compact quad block with swivel alignment, a center becket, and reliable low-friction performance.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSEO Meta Description:\u003c\/strong\u003e Shop the Harken HSB380 57mm quad swivel block with center becket, low-friction sheaves, and a 2,380-pound maximum 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":44937053732953,"sku":"88765","price":208.97,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0623\/1818\/2489\/files\/88765XL.jpg?v=1789836999","url":"https:\/\/www.marinepartsonly.com\/products\/harken-hsb380-57mm-quad-swivel-block-with-center-becket","provider":"Marine Parts Only","version":"1.0","type":"link"}