{"product_id":"lewmar-50mm-synchro-block-single-w-becket-cam-black-1-4-3-8-line-239-29925009","title":"Lewmar 50mm Synchro Block – Single with Becket \u0026 Cam, Black, 1\/4”–3\/8” Line","description":"\u003ch2\u003ePrecision-Engineered for Speed and Low Friction\u003c\/h2\u003e\u003cp\u003eThe Lewmar 50mm Synchro Single Block with Becket and Cam is a compact, high-performance block built for sailors who need smooth, controlled line handling in tight spaces. The integrated cam cleat lets you lock off the line instantly without a separate cleat, while the becket provides a fixed attachment point for building purchase systems. The high-density, free-spin plain bearing and self-aligning swivel head keep friction to a minimum under load.\u003c\/p\u003e\u003cp\u003eConstructed with stainless steel straps and glass-fibre reinforced cheeks, the Synchro series handles the demands of performance sailing while keeping weight low. The sheave, bearing, pin, and line size are matched for optimum efficiency across the 1\/4”–3\/8” line range.\u003c\/p\u003e\u003ch3\u003eCompatible Applications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMainsheet systems with integrated cam lock-off\u003c\/li\u003e\n\u003cli\u003eVang and cunningham purchase systems\u003c\/li\u003e\n\u003cli\u003eControl lines requiring quick cleating on smaller sailboats\u003c\/li\u003e\n\u003cli\u003eRunning rigging on performance dinghies and keelboats\u003c\/li\u003e\n\u003cli\u003eLine sizes: 1\/4” to 3\/8” (6–8mm)\u003c\/li\u003e\n\u003cli\u003eBlock size: 50mm sheave diameter\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eProduct Details\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eConfiguration: Single sheave with becket and cam cleat\u003c\/li\u003e\n\u003cli\u003eSheave diameter: 50mm\u003c\/li\u003e\n\u003cli\u003eLine range: 1\/4”–3\/8” (6–8mm)\u003c\/li\u003e\n\u003cli\u003eColor: Black\u003c\/li\u003e\n\u003cli\u003eBearing: High-density free-spin plain bearing\u003c\/li\u003e\n\u003cli\u003eHead: Self-aligning swivel\u003c\/li\u003e\n\u003cli\u003eConstruction: Stainless steel straps, glass-fibre reinforced cheeks\u003c\/li\u003e\n\u003cli\u003eAttachment: Patented shackle post lock\u003c\/li\u003e\n\u003cli\u003eSKU: 239-29925009\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eBest Use Case:\u003c\/strong\u003e The single-with-becket-and-cam is the go-to block when you need a purchase system anchor point and a quick cleat in one unit — ideal for mainsheet systems on smaller boats where space and weight are at a premium. The cam cleat eliminates the need for a separate cleat fitting, keeping your deck clean and your rigging simple. Best suited for dinghies, day sailors, and performance keelboats in the 20–28 ft range running 1\/4”–3\/8” line.\u003c\/p\u003e\u003ch3\u003eOther 50mm Synchro Blocks\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/lewmar-50mm-synchro-block-single-black-1-4-3-8-line-239-29925001bk\"\u003e50mm Synchro Block – Single, Black\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/lewmar-50mm-synchro-block-synchro-block-double-black-1-4-3-8-line-239-29925002bk\"\u003e50mm Synchro Block – Double, Black\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/lewmar-50mm-synchro-block-synchro-block-triple-black-1-4-3-8-line-239-29925003\"\u003e50mm Synchro Block – Triple, Black\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/lewmar-50mm-synchro-block-single-black-1-4-3-8-line-239-29925004\"\u003e50mm Synchro Block – Single, Black (29925004)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/lewmar-50mm-synchro-double-block-becket-black-29925005bk\"\u003e50mm Synchro Block – Double with Becket, Black\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/lewmar-50mm-synchro-block-triple-w-becket-cam-black-1-4-3-8-line-239-29925010\"\u003e50mm Synchro Block – Triple with Becket \u0026amp; Cam, Black\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/lewmar-50mm-synchro-block-halyard-black-1-4-3-8-line-239-29925021\"\u003e50mm Synchro Halyard Block, Black\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/lewmar-50mm-synchro-block-fiddle-w-becket-black-1-4-3-8-line-239-29925034\"\u003e50mm Synchro Block – Fiddle with Becket, Black\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/lewmar-50mm-synchro-block-fiddle-w-cam-black-1-4-3-8-line-239-29925037\"\u003e50mm Synchro Block – Fiddle with Cam, Black\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOther Synchro Block Sizes\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/lewmar-60mm-synchro-block-single-black-5-16-3-8-line-239-29926001bk\"\u003e60mm Synchro Blocks – 5\/16”–3\/8” Line\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/lewmar-72mm-synchro-block-single-black-3-8-1-2-line-239-29927201\"\u003e72mm Synchro Blocks – 3\/8”–1\/2” Line\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/lewmar-90mm-synchro-block-single-w-becket-black-1-2-9-16-line-239-29929004\"\u003e90mm Synchro Blocks – 1\/2”–9\/16” Line\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003ePair It With\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e\u003ca href=\"\/products\/lewmar-synchro-snap-shackle-239-29925040\"\u003eLewmar Synchro Snap Shackle – 50mm\u003c\/a\u003e\u003c\/li\u003e\u003c\/ul\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":51250739839012,"sku":"239-29925009","price":180.98,"currency_code":"CAD","in_stock":true}],"url":"https:\/\/marisolmarine.com\/products\/lewmar-50mm-synchro-block-single-w-becket-cam-black-1-4-3-8-line-239-29925009","provider":"Marisol Marine Company","version":"1.0","type":"link"}