{"product_id":"lewmar-50mm-synchro-double-block-becket-black-29925005bk","title":"Lewmar 50mm Synchro Double Block with Becket – Black | 29925005BK","description":"\u003ch2\u003eLewmar 50mm Synchro Double Block with Becket – Black\u003c\/h2\u003e\u003cp\u003eThe Lewmar Synchro 50mm Double Block with Becket is a compact, efficient block designed for sailing control systems where mechanical advantage and a secure line termination point are both needed. The twin-sheave configuration delivers smooth load handling, while the integrated becket opens up compact purchase, cascade, and fine-tuning arrangements that a standard double block can’t accommodate.\u003c\/p\u003e\u003cp\u003eLewmar’s Synchro design combines a high-density free-spin bearing, stainless steel strap, glass-fiber reinforced cheeks, and an adjustable swivel-locking system for dependable performance across the full range of running-rigging applications.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 29925005BK\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSheave Diameter:\u003c\/strong\u003e 50 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfiguration:\u003c\/strong\u003e Double sheave with integrated becket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecommended Line Diameter:\u003c\/strong\u003e 1\/4\" (6 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Line Diameter:\u003c\/strong\u003e 3\/8\" (10 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWorking Load Limit:\u003c\/strong\u003e 990 lbs (450 kg)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 5.77 oz (164 g)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShackle Post Diameter:\u003c\/strong\u003e 5\/16\" (7.9 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShackle Pin Diameter:\u003c\/strong\u003e 5\/32\" (4 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Black composite\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarcode \/ UPC:\u003c\/strong\u003e 743683220159\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eDouble-sheave configuration with integrated becket for versatile purchase arrangements\u003c\/li\u003e\n\u003cli\u003eHigh-density free-spin bearing — reduces friction for efficient line handling\u003c\/li\u003e\n\u003cli\u003eGlass-fiber reinforced cheeks — help prevent line wedging under load\u003c\/li\u003e\n\u003cli\u003eStainless steel strap for strength and corrosion resistance\u003c\/li\u003e\n\u003cli\u003eSwivel mechanism configurable for fixed or rotating operation\u003c\/li\u003e\n\u003cli\u003ePatented shackle post lock for secure, easy attachment\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eCompatible Applications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMainsheet systems requiring compact double-block purchase\u003c\/li\u003e\n\u003cli\u003eBoom vangs and kicker systems\u003c\/li\u003e\n\u003cli\u003eOuthaul and Genoa control systems\u003c\/li\u003e\n\u003cli\u003eRunning backstays\u003c\/li\u003e\n\u003cli\u003eHalyard tuning and fine-adjustment arrangements\u003c\/li\u003e\n\u003cli\u003eCascade purchase systems on performance and cruising sailboats\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment Note\u003c\/h3\u003e\u003cp\u003eConfirm the 50 mm sheave size, rope diameter (1\/4\"–3\/8\"), working load, shackle dimensions, becket arrangement, and available installation space before replacing or upgrading an existing block. Running-rigging loads vary substantially by vessel and application.\u003c\/p\u003e\u003ch3\u003eRelated Products\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/lewmar-60mm-synchro-block-double-w-becket-black-5-16-3-8-line\"\u003eLewmar 60mm Synchro Double Block with Becket – Black\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/lewmar-72mm-synchro-block-double-w-becket-black-3-8-1-2-line\"\u003eLewmar 72mm Synchro Double Block with Becket – Black\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/lewmar-50mm-synchro-block-triple-black-1-4-3-8-line\"\u003eLewmar 50mm Synchro Triple Block – Black\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/lewmar-50mm-synchro-block-double-black-1-4-3-8-line\"\u003eLewmar 50mm Synchro Double Block – Black (without Becket)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/lewmar-60mm-synchro-triple-block-becket-cam-black-29926010bk\"\u003eLewmar 60mm Synchro Triple Block with Becket \u0026amp; Cam – Black\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eBest use case:\u003c\/strong\u003e This block is the right call when you need a compact double-block with a built-in termination point — particularly for mainsheet and vang purchase systems where the becket anchors the standing end of the tackle. It’s well suited to smaller performance boats and daysailers where the 50 mm sheave and 450 kg WLL match the load range.\u003c\/p\u003e\u003cp\u003eWhen selecting a replacement or upgrade, focus on the three numbers that matter: 50 mm sheave, 1\/4\"–3\/8\" rope range, and 990 lb working load. Matching those to your existing purchase system is more reliable than choosing by appearance alone. If your loads or line sizes are larger, step up to the \u003ca href=\"\/products\/lewmar-60mm-synchro-block-double-w-becket-black-5-16-3-8-line\"\u003e60mm\u003c\/a\u003e or \u003ca href=\"\/products\/lewmar-72mm-synchro-block-double-w-becket-black-3-8-1-2-line\"\u003e72mm\u003c\/a\u003e version.\u003c\/p\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":51250739707940,"sku":"239-29925005","price":114.53,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/aca475ed-b367-4ddc-93ee-3dbff6054e2b.png?v=1786603041","url":"https:\/\/marisolmarine.com\/products\/lewmar-50mm-synchro-double-block-becket-black-29925005bk","provider":"Marisol Marine Company","version":"1.0","type":"link"}