{"product_id":"ronstan-rf35109hl-series-30-ball-bearing-block-single-becket-lashing","title":"Ronstan RF35109HL Series 30 Ball Bearing Block, Single Becket Lashing","description":"\u003cp\u003e\u003cstrong\u003eSeries 30 Ball Bearing Block Single Becket Option Lashing\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eBall Bearing Blocks boast the highest strength-to-weight ratio available. This is achieved through all-composite reinforced polymer materials and multiple attachment options. Their precision design provides the optimum number of ball bearings for minimum friction while weight reduction is achieved through the use of fibre-reinforced composites in the block head, cleat arms and beckets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHighest Working Load in its Class\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe proven Ronstan 2-stage bearing system (Series 30 and larger) features high compression grade Acetal ball bearings and a secondary full-contact bearing. This gives minimum friction across the full working load range.\u003c\/p\u003e\u003cp\u003eThe sheave and bearing system is supported by a fibre-reinforced load frame, computer modelled and optimised using advanced stress analysis methods. The Dyneema Link, used in multi-sheave blocks, is produced from high spec SK75 fibre, which is 10 times stronger and lighter than steel, and provides the final connection from the block to the load point. \u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSimple, Versatile  Secure Attachment\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe single block is easily lashed to an attachment point, and can also accept Dyneema Links and shackles for a variety of efficient attachment alternatives. The Dyneema Link used in multi-sheave blocks is easily fitted and secured by a removable pin. The Dyneema Link can also be removed and replaced by a shackle, custom lashing or strop.\u003c\/p\u003e\u003cp\u003eThese blocks are far more compatible with Dyneema\/Spectra lines, carbon laminate connection points and webbing than traditional blocks with steel loop tops or shackles.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eLow Profile  Compact\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe two way head in the single lashing block allows for alignment at 0 or 90 orientation, while the single swivel block allows for full articulation.\u003c\/p\u003e\u003cp\u003eThe flexible Dyneema Link used in multi-sheave blocks provides 0 or 90 orientation. It connects directly to the head of the block rather than to an intermediate head post. This reduces weight and gives the lowest possible profile while allowing full articulation. Beckets have been carefully designed to minimise height.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eLightweight\u003c\/li\u003e\n\u003cli\u003eHighest working load in its class\u003c\/li\u003e\n\u003cli\u003eSecure, versatile and secure attachement\u003c\/li\u003e\n\u003cli\u003eLow profile and compact\u003c\/li\u003e\n\u003cli\u003eUltra low profile thru-sheave becket\u003c\/li\u003e\n\u003cli\u003eSelf-lubricating Nylatron sheave and full contact bearing for high dynamic loads\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eMainsheet systems and spinnaker sheets on dinghies to 5M(16')\u003c\/li\u003e\n\u003cli\u003eHalyard, vang and backstay applications on boats to 5M(16')\u003c\/li\u003e\n\u003cli\u003eControl line applications on larger yachts\u003c\/li\u003e\n\u003c\/ul\u003e \u003c!--- cis2:m2lsl5xp ---\u003e\n\u003cp\u003eThe Ronstan RF35109HL Series 30 Ball Bearing Block is a lightweight, low-profile single becket block designed for efficient line handling on dinghies, small boats, and larger yacht control-line systems. Its all-composite reinforced polymer construction and precision ball-bearing system help reduce friction while delivering a strong, compact solution for mainsheet, spinnaker sheet, halyard, vang, and backstay applications.\u003c\/p\u003e\u003cp\u003eDesigned for versatile attachment, this single lashing block can be secured directly to an attachment point and can also accommodate alternative connections such as Dyneema Links, shackles, custom lashings, or strops. Its two-way head supports alignment at 0- or 90-degree orientations, while the compact design helps maintain a low-profile installation. The block is also compatible with Dyneema or Spectra line systems, carbon laminate connection points, and webbing.\u003c\/p\u003e\u003cp\u003eRonstan’s proven two-stage bearing system uses high-compression-grade Acetal ball bearings and a secondary full-contact bearing to provide low friction across the working load range. A fibre-reinforced load frame supports the sheave and bearing system, while the self-lubricating Nylatron sheave is designed for high dynamic loads. The single becket configuration provides a practical option for compact sailboat rigging and control-line applications where dependable, space-conscious hardware is needed.\u003c\/p\u003e\u003cp\u003eChoose the Ronstan RF35109HL Series 30 Ball Bearing Block for a secure, adaptable, and lightweight solution for modern sailing hardware systems.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLightweight construction:\u003c\/strong\u003e All-composite reinforced polymer materials help reduce hardware weight.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEfficient bearing system:\u003c\/strong\u003e Two-stage bearing design with Acetal ball bearings and a secondary full-contact bearing supports low-friction operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVersatile attachment:\u003c\/strong\u003e Single lashing design accepts direct lashing and can accommodate Dyneema Links, shackles, custom lashings, or strops.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow-profile design:\u003c\/strong\u003e Compact block geometry and carefully designed becket help minimize installation height.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexible alignment:\u003c\/strong\u003e Two-way head allows 0- or 90-degree orientation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-load capability:\u003c\/strong\u003e Fibre-reinforced load frame and self-lubricating Nylatron sheave support high dynamic loads.\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 Ronstan\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e Series 30\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart number:\u003c\/strong\u003e RF35109HL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlock type:\u003c\/strong\u003e Ball bearing block with single becket and lashing attachment\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall size:\u003c\/strong\u003e Approximately 2 inches long by 2 inches wide by 1 inch high\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e Approximately 1.6 ounces\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecommended applications:\u003c\/strong\u003e Mainsheet and spinnaker sheet systems on dinghies up to 16 feet; halyard, vang, and backstay applications on boats up to 16 feet; control-line applications on larger yachts\u003c\/li\u003e\n\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":44937125855321,"sku":"80102","price":116.97,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0623\/1818\/2489\/files\/80102XL.jpg?v=1789839319","url":"https:\/\/www.marinepartsonly.com\/products\/ronstan-rf35109hl-series-30-ball-bearing-block-single-becket-lashing","provider":"Marine Parts Only","version":"1.0","type":"link"}