{"product_id":"ronstan-rf40200-series-40-double-ball-bearing-block-with-swivel-head","title":"Ronstan RF40200 Series 40 Double Ball Bearing Block with Swivel Head","description":"\u003cp\u003e\u003cstrong\u003eSeries 40 Ball Bearing Block - Double - Swivel Head\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eLow friction Acetal or Torlon bearing system\u003c\/li\u003e\n\u003cli\u003eLightweight\u003c\/li\u003e\n\u003cli\u003eCheek cut-outs for easy bearing maintenance\u003c\/li\u003e\n\u003cli\u003eFeatures a swivel shackle head for full 360 rotation\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSheaves running on Acetal or Torlon ball bearings provide high performance  low friction. The 2-stage ball bearing system provides consistent performance over the full load range.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eApplications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eMainsheet\u003c\/li\u003e\n\u003cli\u003eHalyard\u003c\/li\u003e\n\u003cli\u003eVang\u003c\/li\u003e\n\u003cli\u003eSpinnaker control lines on off-the-beach catamarans, one design classes and sportsboats up to 8m (26ft)\u003c\/li\u003e\n\u003c\/ul\u003e \u003c!--- cis2:m2lsl5xp ---\u003e\n\u003cp\u003e\u003cstrong\u003eRonstan Series 40 Double Ball Bearing Block with Swivel Head\u003c\/strong\u003e is designed for sailors who need smooth, dependable line handling on off-the-beach catamarans, one-design classes, and sportsboats up to 26 feet. The RF40200 combines a low-friction bearing system with a swivel shackle head, helping mainsheet, halyard, vang, and spinnaker control lines run efficiently while allowing the block to align naturally with changing line angles.\u003c\/p\u003e\u003cbr\u003e\u003cp\u003eSheaves supported by Acetal or Torlon ball bearings deliver high-performance, low-friction operation. The two-stage ball bearing system provides consistent performance across the full load range, making this double block a practical choice for sailing systems that require responsive trimming and reliable line movement. Its lightweight construction helps support efficient rigging without adding unnecessary weight to the system.\u003c\/p\u003e\u003cbr\u003e\u003cp\u003eCheek cut-outs provide convenient access for bearing maintenance, helping sailors service the block when needed. The swivel shackle head rotates through 360 degrees, allowing the block to orient with the line and helping reduce twists or awkward alignment during use. Whether installed for mainsheet control, halyard routing, vang systems, or spinnaker control lines, the RF40200 is built for versatile small-boat sailing applications.\u003c\/p\u003e\u003cbr\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow-friction Acetal or Torlon bearing system:\u003c\/strong\u003e Supports smooth, efficient sheave movement for responsive line handling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo-stage ball bearing system:\u003c\/strong\u003e Provides consistent performance across the full load range.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLightweight design:\u003c\/strong\u003e Helps maintain an efficient sailing and rigging setup.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCheek cut-outs:\u003c\/strong\u003e Provide access for easier bearing maintenance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e360-degree swivel shackle head:\u003c\/strong\u003e Allows the block to align with changing line directions.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cp\u003e\u003cstrong\u003eProduct Details:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Ronstan\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e Series 40\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart number:\u003c\/strong\u003e RF40200\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlock configuration:\u003c\/strong\u003e Double block with swivel head\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBearing type:\u003c\/strong\u003e Acetal or Torlon ball bearing system\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntended applications:\u003c\/strong\u003e Mainsheet, halyard, vang, and spinnaker control lines\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecommended vessel type:\u003c\/strong\u003e Off-the-beach catamarans, one-design classes, and sportsboats up to 26 feet\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cp\u003eChoose the Ronstan RF40200 Series 40 Double Ball Bearing Block for smooth, adaptable line control in demanding small-boat sailing applications.\u003c\/p\u003e\u003cbr\u003e\u003cp\u003e\u003cstrong\u003eSEO Meta Description:\u003c\/strong\u003e Ronstan RF40200 Series 40 double ball bearing block with 360-degree swivel head for smooth, low-friction line control on boats up to 26 feet.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\u003cli\u003eLow-friction Acetal or Torlon ball bearing system for smooth, efficient line handling.\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eTwo-stage ball bearing system provides consistent performance across the full load range.\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eLightweight construction supports an efficient sailing and rigging setup.\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eCheek cut-outs allow easier access for bearing maintenance.\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e360-degree swivel shackle head helps the block align with changing line directions.\u003c\/li\u003e\u003c\/ul\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":"Ronstan","offers":[{"title":"Default Title","offer_id":44881671225433,"sku":"70616","price":84.97,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0623\/1818\/2489\/files\/70616XL.jpg?v=1789193718","url":"https:\/\/www.marinepartsonly.com\/products\/ronstan-rf40200-series-40-double-ball-bearing-block-with-swivel-head","provider":"Marine Parts Only","version":"1.0","type":"link"}