{"product_id":"ronstan-series-25-ball-bearing-orbit-block-with-becket-and-lashing-rf28109","title":"Ronstan Series 25 Ball Bearing Orbit Block with Becket and Lashing - RF28109","description":"\u003cp\u003e\u003cstrong\u003eSeries 25 Ball Bearing Orbit Block - Lashing\u003c\/strong\u003e\u003c\/p\u003e\u003cp id=\"isPasted\"\u003eSingle sheave ball bearing block with becket and lashing head.\u003c\/p\u003e\u003cp id=\"isPasted\"\u003eThe Series 25 Ball Bearing Orbit Blocks deliver superior strength, reduced weight, and exceptional performance for high-demand dinghy and small boat applications.\u003c\/p\u003e\u003cp\u003eDesigned with competitive sailors and performance boats in mind, these compact 25mm blocks are engineered to achieve the highest possible strength-to-weight ratio. Featuring Ronstans renowned high-compression strength acetal bearing system, the Series 25 BB Orbit Blocks are a lightweight yet durable solution, ideal for control line systems such as mainsheet and spinnaker sheet turning blocks, cunninghams, and cascading vangs on dinghies up to 4 metres.\u003c\/p\u003e\u003cp\u003eEach block has a stainless steel hub for versatile lashing attachments and through-sheave becket functionality, making them adaptable to a wide range of rigging setups. The hub accommodates up to 4mm (5\/32) lashing and ensures maximum efficiency without compromising reliability.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli id=\"isPasted\"\u003e2-stage ball bearing system.\u003c\/li\u003e\n\u003cli\u003eSuits up to 8mm (5\/16) lines.\u003c\/li\u003e\n\u003cli\u003eHollow hub for becket take-off.\u003c\/li\u003e\n\u003cli\u003eLashing blocks suit up to 4mm (5\/32) lashing.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli id=\"isPasted\"\u003eMax. Rope diameter (in): 5\/16\u003c\/li\u003e\n\u003cli\u003eSheave diameter (in): 1\u003c\/li\u003e\n\u003cli\u003eB.L. (lb): 1650\u003c\/li\u003e\n\u003cli\u003eWeight (oz): 0.5\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eMainsheet and spinnaker sheet turning blocks on dinghies to 4m (13ft).\u003c\/li\u003e\n\u003cli\u003eControl lines.\u003c\/li\u003e\n\u003cli\u003eCascading vangs.\u003c\/li\u003e\n\u003cli\u003eLeech lines  cunninghams.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eMaterials:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli id=\"isPasted\"\u003eBB Sheave and balls: High compression strength acetal.\u003c\/li\u003e\n\u003cli\u003eFrame\/cheeks: Toughened, glass-fiber-reinforced nylon.\u003c\/li\u003e\n\u003c\/ul\u003e \u003c!--- cis2:m2lsl5xp ---\u003e\n\u003cp\u003eThe Ronstan Series 25 Ball Bearing Orbit Block with Becket and Lashing (Part Number RF28109) is a high-performance, lightweight rigging component designed for competitive sailors and small boat enthusiasts. Crafted with precision and durability in mind, this compact 25mm block offers an exceptional strength-to-weight ratio ideal for controlling mainsheets, spinnaker sheets, and other control lines on dinghies up to 13 feet long.\u003c\/p\u003e \u003cp\u003eConstructed with Ronstan's renowned high-compression strength acetal bearing system, the Series 25 orbit block provides smooth operation and reliable performance even under demanding conditions. Its two-stage ball bearing system ensures minimal friction, allowing for effortless line handling and increased efficiency during racing or recreational sailing. The hollow hub design accommodates up to 4mm (5\/32 inch) lashing, making it versatile for various rigging configurations and easy to adapt to your specific setup.\u003c\/p\u003e \u003cp\u003eDesigned with versatility in mind, this orbit block features a stainless steel hub that supports through-sheave becket functionality and lashing attachments, enabling secure and flexible rigging options. Whether used as a turning block for control lines or as part of a cascading vang system, this durable component maintains high performance over time. Its compact size and lightweight build—just under 1 ounce—make it an ideal choice for performance boats where weight savings are critical.\u003c\/p\u003e \u003cp\u003eManufactured from toughened, glass-fiber-reinforced nylon and high-strength acetal, this Ronstan orbit block is engineered to withstand harsh marine environments. It supports line diameters up to 8mm (5\/16 inch), providing reliable operation across a range of sailing applications. Whether used on a dinghy or small racing boat, the Series 25 orbit block delivers superior performance, durability, and ease of installation for demanding sailing enthusiasts.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\u003cli\u003e2-stage ball bearing system provides smooth and efficient line handling\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eSuitable for lines up to 8mm (5\/16 inch) in diameter\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eHollow hub design allows for quick becket take-off and versatile lashing options\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eLashing blocks support up to 4mm (5\/32 inch) lashing for flexible rigging\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\u003ctbdoy\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\/tbdoy\u003e\n\u003c\/table\u003e\u003cbr\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":43810180202585,"sku":"110654","price":16.35,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0623\/1818\/2489\/files\/110654XL.jpg?v=1784919797","url":"https:\/\/www.marinepartsonly.com\/products\/ronstan-series-25-ball-bearing-orbit-block-with-becket-and-lashing-rf28109","provider":"Marine Parts Only","version":"1.0","type":"link"}