{"product_id":"ronstan-series-55-bb-orbit-block-quad-becket-swivel","title":"Ronstan Series 55 BB Orbit Block, Quad Becket Swivel","description":"\u003c!--TABS SUP--\u003e\u003cdiv class=\"Techparagraph\"\u003e\n\u003cstrong\u003eManufacturer part #:\u003c\/strong\u003e RF55410 1\u003cbr\u003e\u003cbr\u003e\n\u003cdiv class=\"container\"\u003e\n\u003cdiv class=\"cabDes\"\u003eTechnical Description\u003c\/div\u003e\n\u003cdiv class=\"col-4 menu units\"\u003eFeatures\u003c\/div\u003e\n\u003cdiv class=\"col-4 menu units\"\u003eAmerican\u003c\/div\u003e\n\u003cdiv class=\"col-4 menu units\"\u003eMetric\u003c\/div\u003e\n\u003cdiv class=\"col-4 col-12M menu\"\u003eDescription\u003c\/div\u003e\n\u003cdiv class=\"cell col-8 col-12M\"\u003eSeries 55 BB Orbit Quad Becket Swivel Block\u003c\/div\u003e\n\u003cdiv class=\"col-4 col-12M menu\"\u003eSheave Ø\u003c\/div\u003e\n\u003cdiv class=\"cell col-4 col-6M\"\u003e2 5\/32 in\u003c\/div\u003e\n\u003cdiv class=\"cell col-4 col-6M\"\u003e55 mm\u003c\/div\u003e\n\u003cdiv class=\"col-4 col-12M menu\"\u003eMaximum Rope Ø\u003c\/div\u003e\n\u003cdiv class=\"cell col-4 col-6M\"\u003e3\/8 in\u003c\/div\u003e\n\u003cdiv class=\"cell col-4 col-6M\"\u003e10 mm\u003c\/div\u003e\n\u003cdiv class=\"col-4 col-12M menu\"\u003eMaximum Working Load\u003c\/div\u003e\n\u003cdiv class=\"cell col-4 col-6M\"\u003e1650 lb\u003c\/div\u003e\n\u003cdiv class=\"cell col-4 col-6M\"\u003e750 kg\u003c\/div\u003e\n\u003cdiv class=\"col-4 col-12M menu\"\u003eBreaking Load\u003c\/div\u003e\n\u003cdiv class=\"cell col-4 col-6M\"\u003e3300 lb\u003c\/div\u003e\n\u003cdiv class=\"cell col-4 col-6M\"\u003e1500 kg\u003c\/div\u003e\n\u003cdiv class=\"col-4 col-12M menu\"\u003eWeight\u003c\/div\u003e\n\u003cdiv class=\"cell col-4 col-6M\"\u003e11.2 oz\u003c\/div\u003e\n\u003cdiv class=\"cell col-4 col-6M\"\u003e316 g\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- TABS --\u003e\u003cdiv class=\"Techparagraph\"\u003e\n\u003cstrong\u003eManufacturer part #:\u003c\/strong\u003e RF55410\u003cbr\u003e\u003cbr\u003e\u003cli\u003eUltra Lightweight\u003c\/li\u003e\n\u003cli\u003eLow friction 2-stage Orbital ball bearing system\u003c\/li\u003e\n\u003cli\u003eHighest working load in its class\u003c\/li\u003e\n\u003cli\u003eLow profile and compact\u003c\/li\u003e\n\u003cli\u003eHigh performance cleating\u003c\/li\u003e\n\u003cli\u003eSwivel shackle head for unlimited block rotation\u003c\/li\u003e\n\u003cli\u003eStainless steel shackle head for ultimate durability and compatibility with harsh fixing points\u003c\/li\u003e\n\u003cli\u003eUltra low profile integrated beckets\u003c\/li\u003e\n\u003cstrong\u003eLightweight\u003c\/strong\u003e\u003cbr\u003e Kilogram for kilogram of working load, BB and RT Orbit Blocks„¢ are the world's lightest. The unique orbital design allows the bearing to only be in the active areas of the floating sheave. This minimises the mass of the inactive return race and hub. \u003cbr\u003e\u003cbr\u003e Weight and bulk are further reduced in the different block configurations. The ball bearing single and becket block has a through-sheave becket arrangement. The result? The lowest weight possible. \u003cbr\u003e\u003cbr\u003e Multi-sheave blocks have only single intermediate cheeks and an ultra-light and efficient head arrangement. This gives a 30% weight saving advantage over the nearest competitor. Other brands just link together their single blocks. This results in unnecessary double cheeks between each sheave, held together by a heavy steel channel across the top of the block. \u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eHighest working load in its class \u003c\/strong\u003e\u003cbr\u003e The orbital ball-bearing arrangement gives the largest possible bearing race diameter. This maximises load performance. The proven Ronstan 2-stage bearing system features high compression grade acetal ball bearings and a secondary full-contact bearing. This gives minimum friction across the full working load range. \u003cbr\u003e\u003cbr\u003e The floating sheave and bearing system is supported by a fibre-reinforced load frame. The design was computer modelled to be stress optimised. The Dyneema® Link is produced from FSE Robline SK75 fibre, which is 10 times stronger and lighter than steel, and provides the final connection from the block to the load point. \u003cbr\u003e\u003cbr\u003e\u003cspan class=\"subtitles_red\"\u003eApplications\u003c\/span\u003e\u003cbr\u003e\u003cli\u003eMainsheet systems on dinghies, sportsboats and small keelboats to 9 m (30 ft)\u003c\/li\u003e\n\u003cli\u003eSpinnaker sheets on dinghies, sportsboats and small keel boats to 9 m (30 ft)\u003c\/li\u003e\n\u003cli\u003eHalyard, Vang and Backstay application on boats to 8 m (26 ft)\u003c\/li\u003e\n\u003cli\u003eControl line applications on larger yachts\u003c\/li\u003e\n\u003cli\u003eMainsheet systems and spinnaker sheets on dinghies, catamarans, sportsboats and small keel boats to 9 m (30 ft)\u003c\/li\u003e\n\u003cli\u003eRF55410 when paired with a RF56330B and a RF35101 lashed to the becket produces a powerful 8:1 mainsheet system for use on catamarans to 5.5 m (18 ft). This can be increased to 9:1 by replacing the RF35101 with a RF35202\u003c\/li\u003e\n\u003cspan class=\"subtitles_red\"\u003eMaterials\u003c\/span\u003e\u003cbr\u003e\u003cli\u003eBall bearings - High compression strength carbon black Acetal\u003c\/li\u003e\n\u003cli\u003eStage 2 bearing - Carbon fibre reinforced, PTFE impregnated Nylon\u003c\/li\u003e\n\u003cli\u003eFrame\/Cheeks - Toughened, glass fibre reinforced Nylon\u003c\/li\u003e\n\u003cli\u003eRope Link: UV stabilised, multi-strand impregmented SK75 Dyneema®\u003c\/li\u003e\n\u003cli\u003eHead fitting: grade 316 stainless steel\u003c\/li\u003e\n\u003cli\u003eBall Bearings: high compression strength carbon black Acetal\u003c\/li\u003e\n\u003c\/div\u003e\n\u003c!-- FIN SCRIP PANLS--\u003e\n\u003c\/div\u003e","brand":"Ronstan Sailboat Hardware","offers":[{"title":"Default Title","offer_id":53594464125300,"sku":"RONRF55410","price":204.8,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0934\/4004\/9524\/files\/RONRF55410-2__42508.jpg.1428984928.jpg?v=1761730501","url":"https:\/\/velasailingsupply.com\/products\/ronstan-series-55-bb-orbit-block-quad-becket-swivel","provider":"Vela Sailing Supply","version":"1.0","type":"link"}