{"product_id":"ronstan-rf15101-series-15-ball-bearing-utility-block-single-block-with-loop-head","title":"Ronstan RF15101 Series 15 Ball Bearing Utility Block – Single Block with Loop Head","description":"\u003cp\u003e\u003cstrong\u003eSeries 15 Ball Bearing Utility Block - Single Block, Loop Head\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eSmallest and lightest ball bearing block available\u003c\/li\u003e\n\u003cli\u003ePrecision molded acetal sheave running on stainless steel ball bearings provide high performance  low friction\u003c\/li\u003e\n\u003cli\u003eSingle loop head blocks include an O-ring to separate running line from head lashing or fixing\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eDinghy control lines\u003c\/li\u003e\n\u003cli\u003eVangs, cunninghams and tweakers\u003c\/li\u003e\n\u003cli\u003eShock cord tensioning systems\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eMaterials:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBB sheaves: UV stabilized acetal\u003c\/li\u003e\n\u003cli\u003eBall bearings: Stainless steel\u003c\/li\u003e\n\u003cli\u003eCheeks: Grade 316 stainless steel\u003c\/li\u003e\n\u003c\/ul\u003e \u003c!--- cis2:m2lsl5xp ---\u003e\n\u003cp\u003e\u003cstrong\u003eRonstan RF15101 Series 15 Ball Bearing Utility Block\u003c\/strong\u003e is a compact, lightweight single block designed for dinghy control lines, sailboat adjustment systems, and shock cord tensioning applications. Its loop head configuration provides a practical attachment point, while the precision-molded sheave and stainless steel ball bearings support smooth, low-friction line movement in compact rigging setups.\u003c\/p\u003e\u003cbr\u003e\u003cp\u003eBuilt for applications where efficient line handling and minimal weight are important, this Ronstan ball bearing block is suited to vangs, cunninghams, tweakers, and other dinghy control systems. The single loop head includes an O-ring that helps separate the running line from the head lashing or fixing, providing a more organized installation. Its compact Series 15 format is well suited to smaller control lines and space-conscious rigging configurations.\u003c\/p\u003e\u003cbr\u003e\u003cp\u003e\u003cstrong\u003eKEY FEATURES:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFeature: Compact, lightweight design:\u003c\/strong\u003e The Series 15 utility block is Ronstan’s smallest and lightest ball bearing block, making it suitable for weight-conscious control-line systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFeature: Precision-molded acetal sheave:\u003c\/strong\u003e The UV-stabilized acetal sheave is designed to support high-performance, low-friction operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFeature: Stainless steel ball bearings:\u003c\/strong\u003e Ball bearings help the sheave run smoothly for responsive line adjustment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFeature: Single loop head with O-ring:\u003c\/strong\u003e The O-ring separates the running line from head lashing or fixing during installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFeature: Versatile rigging applications:\u003c\/strong\u003e Suitable for dinghy control lines, vangs, cunninghams, tweakers, and shock cord tensioning systems.\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\u003ePart number:\u003c\/strong\u003e RF15101\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct type:\u003c\/strong\u003e Series 15 ball bearing utility block\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfiguration:\u003c\/strong\u003e Single block with loop head\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSheave material:\u003c\/strong\u003e UV-stabilized acetal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBall bearing material:\u003c\/strong\u003e Stainless steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCheek material:\u003c\/strong\u003e Grade 316 stainless steel\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cp\u003eChoose the Ronstan RF15101 Series 15 Ball Bearing Utility Block for compact, low-friction control-line performance and dependable loop-head installation in dinghy and sailing rigging systems.\u003c\/p\u003e\u003cbr\u003e\u003cp\u003e\u003cstrong\u003eSEO META DESCRIPTION:\u003c\/strong\u003e Ronstan RF15101 Series 15 ball bearing utility block with loop head delivers compact, low-friction control for dinghy lines, vangs, and tweakers.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\u003cli\u003eCompact, lightweight Series 15 design for weight-conscious dinghy and sailing control-line systems.\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003ePrecision-molded UV-stabilized acetal sheave supports high-performance, low-friction operation.\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eStainless steel ball bearings help the sheave run smoothly for responsive line adjustment.\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eSingle loop head includes an O-ring to separate the running line from head lashing or fixing.\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eSuitable for dinghy control lines, vangs, cunninghams, tweakers, and shock cord tensioning systems.\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":44881666441305,"sku":"71020","price":28.97,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0623\/1818\/2489\/files\/71020XL.jpg?v=1789193232","url":"https:\/\/www.marinepartsonly.com\/products\/ronstan-rf15101-series-15-ball-bearing-utility-block-single-block-with-loop-head","provider":"Marine Parts Only","version":"1.0","type":"link"}