{"title":"Ronstan Fiddle Blocks","description":"\u003cp\u003eRonstan fiddle blocks for increased control and efficiency in line handling and rigging. \u003ca href=\"#seo-description\"\u003eClick here to read more.\u003c\/a\u003e\u003c\/p\u003e","products":[{"product_id":"ronrf186","title":"Ronstan Series 29 Fiddle Block","description":"\u003cp\u003eThe Ronstan Series 29 Fiddle Block #RF186 is a versatile piece of sailing gear designed to simplify rigging on dinghies and larger yachts. It's crafted for lightweight durability, making it a reliable choice for sailors looking for maintenance-free equipment. With its economical design and robust construction, it fits seamlessly into any sailing setup without fuss.\u003c\/p\u003e\u003cp\u003eConstructed from high-quality materials like U.V. stabilized Acetal sheaves and Grade 316 stainless steel cheeks, the block is built to last. It's perfect for various sailing applications, including vang, cunningham, and trapeze retriever systems on dinghies, as well as leech line tackles and bunk adjusters on larger yachts.\u003c\/p\u003e\u003cp\u003eUsage\u003c\/p\u003e\u003cp\u003eIdeal for use in multiple sailing scenarios, this block is especially suited for enhancing control and performance in dinghy sailing setups and larger yacht adjustments.\u003c\/p\u003e\u003cp\u003eOur Part #RONRF186 | Mfr. Part #RF186\u003c\/p\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":49347691970866,"sku":"RONRF186","price":33.86,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0879\/4908\/2930\/files\/RONRF186.jpg?v=1735835666"},{"product_id":"ronrf187","title":"Ronstan Series 29 Fiddle Block With Vee Jam","description":"\u003cul\u003e\n\u003cli\u003eVang, cunningham and trapeze retriever systems on dinghies.\u003c\/li\u003e\n\u003cli\u003eLeech line tackles, bunk adjusters etc on larger yachts. \u003c\/li\u003e\n\u003cli\u003eU.V. stabilised Acetal sheaves.\u003c\/li\u003e\n\u003cli\u003eGrade 316 stainless steel cheeks\u003c\/li\u003e\n\u003cli\u003eLight Weight: durable construction.\u003c\/li\u003e\n\u003cli\u003eEconomical.\u003c\/li\u003e\n\u003cli\u003eMaintenance free.\u003c\/li\u003e \u003c\/ul\u003e\u003cp\u003e Our Part # RONRF187 | Ronstan Part # RF187\u003c\/p\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":49347727589682,"sku":"RONRF187","price":39.07,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0879\/4908\/2930\/files\/RONRF187.jpg?v=1735835648"},{"product_id":"ronrf41500","title":"Ronstan Series 40 AP Block, Fiddle","description":"\u003cp\u003eAll purpose (AP) blocks are a great all around solution. Self-lubricating Acetal polymer sheaves running on polished stainless steel races perform equally well with dynamic loads and high static loads. For durability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing.Captive Lock universal head can be fixed in either of two planes, or free to swivel as required\u003c\/p\u003e\u003cp\u003eOur Part # RONRF41500 | Ronstan Part # RF41500\u003c\/p\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":49347764912434,"sku":"RONRF41500","price":51.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0879\/4908\/2930\/files\/RONRF41500.jpg?v=1735835672"},{"product_id":"ronrf41510","title":"Ronstan Series 40 AP Block, Fiddle Becket","description":"\u003cp\u003eAll purpose (AP) blocks are a great all around solution. Self-lubricating Acetal polymer sheaves running on polished stainless steel races perform equally well with dynamic loads and high static loads. For durability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing.Captive Lock universal head can be fixed in either of two planes, or free to swivel as required. Becket pin is removeable so line can be spliced prior to fitting and is ingeniously locked into position without the use of a clevis pin, split ring or tools\u003c\/p\u003e\u003cp\u003eOur Part # RONRF41510 | Ronstan Part # RF41510\u003c\/p\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":49347784540466,"sku":"RONRF41510","price":55.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0879\/4908\/2930\/files\/RONRF41510.jpg?v=1735835685"},{"product_id":"ron-rf40500","title":"Ronstan Series 40 BB Block, Fiddle","description":"\u003cp\u003eSheaves running on Acetal or Torlon ® ball bearings provide high performance \u0026amp; low friction. The 2-stage ball bearing system provides consistent performance over the full load range.Captive Lock's universal head can be fixed in either of two planes, or free to swivel as required\u003c\/p\u003e\u003cp\u003eOur Part # RON-RF40500 | Ronstan Part # RF40500\u003c\/p\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":49347799384370,"sku":"RON-RF40500","price":59.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0879\/4908\/2930\/files\/RON-RF40500.jpg?v=1728039855"},{"product_id":"ron-rf40510","title":"Ronstan Series 40 BB Block, Fiddle, Becket","description":"\u003cp\u003eSheaves running on Acetal or Torlon ® ball bearings provide high performance \u0026amp; low friction. The 2-stage ball bearing system provides consistent performance over the full load range.Captive Lock's universal head can be fixed in either of two planes, or free to swivel as required. Becket pin is removeable so line can be spliced prior to fitting and is ingeniously locked into position without the use of a clevis pin, split ring or tools\u003c\/p\u003e\u003cp\u003eOur Part # RON-RF40510 | Ronstan Part # RF40510\u003c\/p\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":49347820978482,"sku":"RON-RF40510","price":64.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0879\/4908\/2930\/files\/RON-RF40510.jpg?v=1728057421"},{"product_id":"ronrf51500","title":"Ronstan Series 50 AP Block, Fiddle","description":"\u003cp\u003eAll purpose (AP) blocks are a great all around solution. Self-lubricating Acetal polymer sheaves running on polished stainless steel races perform equally well with dynamic loads and high static loads. For durability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing. Captive Lock universal head can be fixed in either of two planes, or free to swivel as required\u003c\/p\u003e\u003cp\u003eOur Part # RONRF51500 | Ronstan Part # RF51500\u003c\/p\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":49347831988530,"sku":"RONRF51500","price":67.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0879\/4908\/2930\/files\/RONRF51500.jpg?v=1735835677"},{"product_id":"ron-rf55510","title":"Ronstan Series 55 BB Orbit Block, Fiddle Becket Swivel","description":"\u003cp\u003eLightweight\u003c\/p\u003e\u003cp\u003eKilogram 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.\u003c\/p\u003e\u003cp\u003eWeight 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.\u003c\/p\u003e\u003cp\u003eMulti-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.\u003c\/p\u003e\u003cp\u003eThe 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.\u003c\/p\u003e\u003cp\u003eThe 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.\u003c\/p\u003e\u003cp\u003eOur Part # RON-RF55510 | Ronstan Part # RF55510\u003c\/p\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":49347847127346,"sku":"RON-RF55510","price":71.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0879\/4908\/2930\/files\/RON-RF55510.jpg?v=1728057809"},{"product_id":"ron-rf50500","title":"Ronstan Series 50 BB Block, Fiddle","description":"\u003cp\u003eSheaves running on Acetal or Torlon ball bearings provide high performance \u0026amp; low friction. The 2-stage ball bearing system provides consistent performance over the full load range.Captive Lock's universal head can be fixed in either of two planes, or free to swivel as required\u003c\/p\u003e\u003cp\u003eOur Part # RON-RF50500 | Ronstan Part # RF50500\u003c\/p\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":49347854041394,"sku":"RON-RF50500","price":73.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0879\/4908\/2930\/files\/RON-RF50500.jpg?v=1728031174"},{"product_id":"ronrf51510","title":"Ronstan Series 50 AP Block, Fiddle, Becket","description":"\u003cp\u003eAll purpose (AP) blocks are a great all around solution. Self-lubricating Acetal polymer sheaves running on polished stainless steel races perform equally well with dynamic loads and high static loads. For durability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing. Captive Lock universal head can be fixed in either of two planes, or free to swivel as required. Becket pin is removeable so line can be spliced prior to fitting and is ingeniously locked into position without the use of a clevis pin, split ring or tools\u003c\/p\u003e\u003cp\u003eOur Part # RONRF51510 | Ronstan Part # RF51510\u003c\/p\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":49347880354098,"sku":"RONRF51510","price":74.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0879\/4908\/2930\/files\/RONRF51510.jpg?v=1735835651"},{"product_id":"ron-rf40520","title":"Ronstan Series 40 BB Block, Fiddle, Cleat","description":"\u003cp\u003eSheaves running on Acetal or Torlon ® ball bearings provide high performance \u0026amp; low friction. The 2-stage ball bearing system provides consistent performance over the full load range.Captive Lock's universal head can be fixed in either of two planes, or free to swivel as required. Quick adjusting cleat arms require no tools to adjust and fix securely in position.\u003c\/p\u003e\u003cp\u003eOur Part # RON-RF40520 | Ronstan Part # RF40520\u003c\/p\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":49347965354290,"sku":"RON-RF40520","price":97.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0879\/4908\/2930\/files\/RON-RF40520.jpg?v=1728044591"},{"product_id":"ronrf56510","title":"Ronstan Series 55 RT Orbit Block, Fiddle Becket Swivel","description":"\u003cp\u003eAutomatic ratchet block:Now you can enjoy the flexibility of setting up your ratchet blocks to suit yourself. Ronstan is the only company that offers a ratchet block with both auto and manual engagement modes*. In the auto mode of the ratchet mechanism engages when load is applied, but switches off when it's released. This lets the sheet run out smoothly and freely-great for rapid easing of the sheet and for gybing asymmetric spinnakers. In manual mode, the ratchet mechanism can be switched on or off as required. This is the preferred mainsheet set-up for may top sailors. Try the block in both modes and see which you prefer - you really can't go wrong.Awesome ratchet block holding power:Quite simply, Ronstan Ratchet Orbit Blocks™ have the highest holding power available. The sophisticated NC-machined sheave features Generation 2 of our patented sheave cross-hole geometry. Its holding power is up to 21:1, almost double that of our nearest competitior. The unique sheave design has 12 gripping faces which directly resist loaded line movement. Traditional designes have only 8 faces with an angled resistance to line movement. Our Generation 2 design has straight resistance faces which both distribute the load and minimise rope wear. These faces are offset from the radial line, to draw the rope down into the gripping area when under load. Our Part # RONRF56510 | Ronstan Part # RF56510\u003c\/p\u003e\u003cp\u003eNow you can enjoy the flexibility of setting up your ratchet blocks to suit yourself. Ronstan is the only company that offers a ratchet block with both auto and manual engagement modes*. In the auto mode of the ratchet mechanism engages when load is applied, but switches off when it's released. This lets the sheet run out smoothly and freely-great for rapid easing of the sheet and for gybing asymmetric spinnakers. In manual mode, the ratchet mechanism can be switched on or off as required. This is the preferred mainsheet set-up for may top sailors. Try the block in both modes and see which you prefer - you really can't go wrong.\u003c\/p\u003e\u003cp\u003eAwesome ratchet block holding power:Quite simply, Ronstan Ratchet Orbit Blocks™ have the highest holding power available. The sophisticated NC-machined sheave features Generation 2 of our patented sheave cross-hole geometry. Its holding power is up to 21:1, almost double that of our nearest competitior. The unique sheave design has 12 gripping faces which directly resist loaded line movement. Traditional designes have only 8 faces with an angled resistance to line movement. Our Generation 2 design has straight resistance faces which both distribute the load and minimise rope wear. These faces are offset from the radial line, to draw the rope down into the gripping area when under load.\u003c\/p\u003e\u003cp\u003eQuite simply, Ronstan Ratchet Orbit Blocks™ have the highest holding power available. The sophisticated NC-machined sheave features Generation 2 of our patented sheave cross-hole geometry. Its holding power is up to 21:1, almost double that of our nearest competitior. The unique sheave design has 12 gripping faces which directly resist loaded line movement. Traditional designes have only 8 faces with an angled resistance to line movement. Our Generation 2 design has straight resistance faces which both distribute the load and minimise rope wear. These faces are offset from the radial line, to draw the rope down into the gripping area when under load.\u003c\/p\u003e\u003cp\u003eOur Part # RONRF56510 | Ronstan Part # RF56510\u003c\/p\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":49347968500018,"sku":"RONRF56510","price":98.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0879\/4908\/2930\/files\/RONRF56510.jpg?v=1735835641"},{"product_id":"ron-rf40530","title":"Ronstan Series 40 BB Block, Fiddle, Becket, Cleat","description":"\u003cp\u003eSheaves running on Acetal or Torlon ® ball bearings provide high performance \u0026amp; low friction. The 2-stage ball bearing system provides consistent performance over the full load range.Captive Lock's universal head can be fixed in either of two planes, or free to swivel as required. Quick adjusting cleat arms require no tools to adjust and fix securely in position. Becket pin is removeable so line can be spliced prior to fitting\u003c\/p\u003e\u003cp\u003eOur Part # RON-RF40530 | Ronstan Part # RF40530\u003c\/p\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":49347980493106,"sku":"RON-RF40530","price":101.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0879\/4908\/2930\/files\/RON-RF40530.jpg?v=1728052181"},{"product_id":"ronrf41520","title":"Ronstan Series 40 AP Block, Fiddle, Cleat","description":"\u003cp\u003eAll purpose (AP) blocks are a great all around solution. Self-lubricating Acetal polymer sheaves running on polished stainless steel races perform equally well with dynamic loads and high static loads. For durability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing.Captive Lock universal head can be fixed in either of two planes, or free to swivel as required. Quick adjusting cleat arms require no tools to adjust and fix securely in position.\u003c\/p\u003e\u003cp\u003eOur Part # RONRF41520 | Ronstan Part # RF41520\u003c\/p\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":49348013523250,"sku":"RONRF41520","price":111.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0879\/4908\/2930\/files\/RONRF41520.jpg?v=1735835634"},{"product_id":"ronrf41530","title":"Ronstan Series 40 AP Block, Fiddle, Becket, Cleat","description":"\u003cp\u003eAll purpose (AP) blocks are a great all around solution. Self-lubricating Acetal polymer sheaves running on polished stainless steel races perform equally well with dynamic loads and high static loads. For durability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing.Captive Lock universal head can be fixed in either of two planes, or free to swivel as required. Quick adjusting cleat arms require no tools to adjust and fix securely in position.\u003c\/p\u003e\u003cp\u003eOur Part # RONRF41530 | Ronstan Part # RF41530\u003c\/p\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":49348026499378,"sku":"RONRF41530","price":114.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0879\/4908\/2930\/files\/RONRF41530.jpg?v=1735835634"},{"product_id":"ronrf51530","title":"Ronstan Series 50 AP Block, Fiddle, Becket, Cleat","description":"\u003cp\u003eAll purpose (AP) blocks are a great all around solution. Self-lubricating Acetal polymer sheaves running on polished stainless steel races perform equally well with dynamic loads and high static loads. For durability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing. Captive Lock universal head can be fixed in either of two planes, or free to swivel as required. Quick adjusting cleat arms require no tools to adjust and fix securely in position \u003c\/p\u003e\u003cp\u003e Our Part # RONRF51530 | Ronstan Part # RF51530\u003c\/p\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":49348079386930,"sku":"RONRF51530","price":135.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0879\/4908\/2930\/files\/RONRF51530.jpg?v=1735835678"},{"product_id":"ron-rf50530","title":"Ronstan Series 50 BB Block, Fiddle, Becket, Cleat","description":"\u003cp\u003eSheaves running on Acetal or Torlon  ball bearings provide high performance \u0026amp; low friction. The 2-stage ball bearing system provides consistent performance over the full load range.Captive Lock™ universal head can be fixed in either of two planes, or free to swivel as required. Quick adjusting cleat arms require no tools to adjust and fix securely in position.\u003c\/p\u003e\u003cp\u003e\u003c\/p\u003e\u003cp\u003e\u003c\/p\u003e\u003cp\u003e\u003c\/p\u003e\u003cp\u003e\u003c\/p\u003e\u003cp\u003e Our Part # RON-RF50530 | Ronstan Part # RF50530\u003c\/p\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":49348148068658,"sku":"RON-RF50530","price":146.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0879\/4908\/2930\/files\/RON-RF50530.jpg?v=1728033252"},{"product_id":"ronrf64500","title":"Ronstan Series 60 Core Block, Fiddle","description":"\u003cp\u003eCore Blocks™ are a true all round solution. A tuned 2-stage bearing system provides excellent performance across the full working load range with an integrated thrust bearing feature and the resilience to handle high dynamic or static loads. Acetal sheave, alloy cheeks and stainless fixings complete the durable package. For reliability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing.\u003c\/p\u003e\n  \n\u003cp\u003e\u003cb\u003eUniversal Bearing\u003c\/b\u003e\u003cbr\u003e\nDynamic and high static load performance\u003cbr\u003e\nThe Ronstan Universal Bearing incorporates our proven 2-stage bearing system\u003cbr\u003e\nStage 1 - Under moderate loads, Acetal ball bearings ensure minimum friction.\u003cbr\u003e\nStage 2 - Under heavy loads, where deformation of ball bearings alone would result in increased friction, a sliding Acetal bearing on a polished stainless steel race takes over, maintaining low friction performance.\u003cbr\u003e\nAdditionally the ball bearings are configured to act as a thrust bearing between the sheave and cheeks, preventing the sheave from rubbing on the cheeks and causing friction when the line lead in and out of the block isn't perfect. Particularly important for cheek blocks.\u003c\/p\u003e\n \n\u003cp\u003e\u003cb\u003eAlloy cheek plates\u003c\/b\u003e\u003cbr\u003e\nBlock cheeks are manufactured from the highest quality alloy for maximum strength. Material optimisation and the cut-away design minimises weight and allows easy fresh water rinsing of salt and debris from the bearings.  Cheek design has been further styled with flaring at the block throat and reduced gap between the cheek and sheave, minimising rope wear.\u003c\/p\u003e\n  \n\u003cp\u003e\u003cb\u003eApplications\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e          \u003cli\u003eIdeal for mainsheet, halyard and spinnaker sheet applications on boats to 11m (36ft).\u003c\/li\u003e\n\u003cli\u003eVarious control line applications on larger yachts.\u003c\/li\u003e\n\u003cli\u003eAlloy sheave models are available for use with wire.        \u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e Our Part # RONRF64500 | Ronstan Part # RF64500\u003c\/p\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":49348340416818,"sku":"RONRF64500","price":171.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0879\/4908\/2930\/files\/RONRF64500.jpg?v=1735835660"},{"product_id":"ronrf55530","title":"Ronstan Series 55 BB Orbit Block, Fiddle Becket Cleat Swivel","description":"\u003cp\u003eThe Ronstan Series 55 BB Orbit Block, Fiddle Becket Cleat Swivel #RF55530 is designed to be incredibly lightweight yet robust, making it ideal for small to mid-sized sailing applications. Its unique orbital design reduces mass without compromising on performance, and the stainless steel fitting ensures durability and reliability on the water. This block is perfect for sailors looking for efficiency and strength in their rigging components.\u003c\/p\u003e  \u003cp\u003eThis block features high compression strength carbon black acetal ball bearings and a carbon fibre reinforced, PTFE impregnated nylon sheave, ensuring long-lasting, low-friction performance. The frame and cheeks are made from toughened, glass fibre reinforced nylon, and the rope link is crafted from UV-stabilized SK75 Dyneema®. Compatible with mainsheet, halyard, vang, and backstay applications on boats up to 9m (30ft) and sportsboats.\u003c\/p\u003e \u003cb\u003eUsage\u003c\/b\u003e \u003cp\u003eIdeal for mainsheet systems and spinnaker sheets on dinghies, sportsboats, and small keelboats. Suitable for control line applications on larger yachts.\u003c\/p\u003e \u003cp\u003e Our Part # RONRF55530 | Mfr. Part # RF55530 \u003c\/p\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":49348638081330,"sku":"RONRF55530","price":166.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0879\/4908\/2930\/files\/RONRF55530.jpg?v=1735835653"},{"product_id":"ronrf64503","title":"Ronstan Series 60 Core Block, Fiddle, Snap Shackle","description":"\u003cp\u003eCore Blocks™ are a true all round solution. A tuned 2-stage bearing system provides excellent performance across the full working load range with an integrated thrust bearing feature and the resilience to handle high dynamic or static loads. Acetal sheave, alloy cheeks and stainless fixings complete the durable package. For reliability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing.\u003c\/p\u003e\n  \n \u003cp\u003e\u003cb\u003eUniversal Bearing\u003c\/b\u003e\u003cbr\u003e\n Dynamic and high static load performance\u003cbr\u003e\n The Ronstan Universal Bearing incorporates our proven 2-stage bearing system\u003cbr\u003e\n Stage 1 - Under moderate loads, Acetal ball bearings ensure minimum friction.\u003cbr\u003e\n Stage 2 - Under heavy loads, where deformation of ball bearings alone would result in increased friction, a sliding Acetal bearing on a polished stainless steel race takes over, maintaining low friction performance.\u003cbr\u003e\n Additionally the ball bearings are configured to act as a thrust bearing between the sheave and cheeks, preventing the sheave from rubbing on the cheeks and causing friction when the line lead in and out of the block isn't perfect. Particularly important for cheek blocks.\u003c\/p\u003e\n  \n \u003cp\u003e\u003cb\u003eAlloy cheek plates\u003c\/b\u003e\u003cbr\u003e\n Block cheeks are manufactured from the highest quality alloy for maximum strength. Material optimisation and the cut-away design minimises weight and allows easy fresh water rinsing of salt and debris from the bearings. Cheek design has been further styled with flaring at the block throat and reduced gap between the cheek and sheave, minimising rope wear.\u003c\/p\u003e\n  \n \u003cp\u003e\u003cb\u003eApplications\u003c\/b\u003e\u003c\/p\u003e\n \u003cul\u003e \u003cli\u003eIdeal for mainsheet, halyard and spinnaker sheet applications on boats to 11m (36ft).\u003c\/li\u003e\n \u003cli\u003eVarious control line applications on larger yachts.\u003c\/li\u003e\n \u003cli\u003eAlloy sheave models are available for use with wire. \u003c\/li\u003e\n \u003c\/ul\u003e\u003cp\u003e Our Part # RONRF64503 | Mfr. Part # RF64503\u003c\/p\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":49348638179634,"sku":"RONRF64503","price":243.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0879\/4908\/2930\/files\/RONRF64503.jpg?v=1735835647"},{"product_id":"ronrf56530","title":"Ronstan Series 55 RT Orbit Block, Fiddle Becket Cleat Swivel","description":"\u003cp\u003e\u003cb\u003eAutomatic ratchet block:\u003c\/b\u003e\u003cbr\u003e\n Now you can enjoy the flexibility of setting up your ratchet blocks to suit yourself. Ronstan is the only company that offers a ratchet block with both auto and manual engagement modes*. In the auto mode of the ratchet mechanism engages when load is applied, but switches off when it's released. This lets the sheet run out smoothly and freely-great for rapid easing of the sheet and for gybing asymmetric spinnakers. In manual mode, the ratchet mechanism can be switched on or off as required. This is the preferred mainsheet set-up for may top sailors. Try the block in both modes and see which you prefer - you really can't go wrong.\u003c\/p\u003e\n \u003cp\u003e\u003cb\u003eAwesome ratchet block holding power:\u003c\/b\u003e\u003cbr\u003e\n Quite simply, Ronstan Ratchet Orbit Blocks™ have the highest holding power available. The sophisticated NC-machined sheave features Generation 2 of our patented sheave cross-hole geometry. Its holding power is up to 21:1, almost double that of our nearest competitior. The unique sheave design has 12 gripping faces which directly resist loaded line movement. Traditional designes have only 8 faces with an angled resistance to line movement. Our Generation 2 design has straight resistance faces which both distribute the load and minimise rope wear. These faces are offset from the radial line, to draw the rope down into the gripping area when under load.\u003c\/p\u003e\n \n \u003cp\u003e\u003cb\u003eMaterials:\u003c\/b\u003e\u003c\/p\u003e\u003cp\u003e\u003c\/p\u003e\n \u003cul\u003e \u003cli\u003eSheave: Anodised Aluminium\u003c\/li\u003e\n \u003cli\u003eBall Bearings: High compression strength carbon black Aceetal\u003c\/li\u003e\n \u003cli\u003eFrame\/Cheeks: Toughened, glass fibre reinforced Nylon\u003c\/li\u003e\n \u003cli\u003eRope Link: UV stabilised, multi-strand impregnated SK75 Dyneema®\u003c\/li\u003e\n \u003c\/ul\u003e\u003cp\u003e Our Part # RONRF56530 | Mfr. Part # RF56530\u003c\/p\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":49348678451506,"sku":"RONRF56530","price":189.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0879\/4908\/2930\/files\/RONRF56530.jpg?v=1735835663"},{"product_id":"ronrf64520","title":"Ronstan Series 60 Core Block, Fiddle, Cleat","description":"\u003cp\u003eCore Blocks™ are a true all round solution. A tuned 2-stage bearing system provides excellent performance across the full working load range with an integrated thrust bearing feature and the resilience to handle high dynamic or static loads. Acetal sheave, alloy cheeks and stainless fixings complete the durable package. For reliability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing.\u003c\/p\u003e\n  \n \u003cp\u003e\u003cb\u003eUniversal Bearing\u003c\/b\u003e\u003cbr\u003e\n Dynamic and high static load performance\u003cbr\u003e\n The Ronstan Universal Bearing incorporates our proven 2-stage bearing system\u003cbr\u003e\n Stage 1 - Under moderate loads, Acetal ball bearings ensure minimum friction.\u003cbr\u003e\n Stage 2 - Under heavy loads, where deformation of ball bearings alone would result in increased friction, a sliding Acetal bearing on a polished stainless steel race takes over, maintaining low friction performance.\u003cbr\u003e\n Additionally the ball bearings are configured to act as a thrust bearing between the sheave and cheeks, preventing the sheave from rubbing on the cheeks and causing friction when the line lead in and out of the block isn't perfect. Particularly important for cheek blocks.\u003c\/p\u003e\n  \n \u003cp\u003e\u003cb\u003eAlloy cheek plates\u003c\/b\u003e\u003cbr\u003e\n Block cheeks are manufactured from the highest quality alloy for maximum strength. Material optimisation and the cut-away design minimises weight and allows easy fresh water rinsing of salt and debris from the bearings. Cheek design has been further styled with flaring at the block throat and reduced gap between the cheek and sheave, minimising rope wear.\u003c\/p\u003e\n  \n \u003cp\u003e\u003cb\u003eApplications\u003c\/b\u003e\u003c\/p\u003e\n \u003cul\u003e \u003cli\u003eIdeal for mainsheet, halyard and spinnaker sheet applications on boats to 11m (36ft).\u003c\/li\u003e\n \u003cli\u003eVarious control line applications on larger yachts.\u003c\/li\u003e\n \u003cli\u003eAlloy sheave models are available for use with wire. \u003c\/li\u003e\n \u003c\/ul\u003e\u003cp\u003e Our Part # RONRF64520 | Mfr. Part # RF64520\u003c\/p\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":49348832428338,"sku":"RONRF64520","price":280.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0879\/4908\/2930\/files\/RONRF64520.jpg?v=1735835644"},{"product_id":"ronrf64523","title":"Ronstan Series 60 Core Block, Fiddle Cleat Snap Shackle","description":"\u003cp\u003eCore Blocks™ are a true all round solution. A tuned 2-stage bearing system provides excellent performance across the full working load range with an integrated thrust bearing feature and the resilience to handle high dynamic or static loads. Acetal sheave, alloy cheeks and stainless fixings complete the durable package. For reliability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing.\u003c\/p\u003e\n  \n \u003cp\u003e\u003cb\u003eUniversal Bearing\u003c\/b\u003e\u003cbr\u003e\n Dynamic and high static load performance\u003cbr\u003e\n The Ronstan Universal Bearing incorporates our proven 2-stage bearing system\u003cbr\u003e\n Stage 1 - Under moderate loads, Acetal ball bearings ensure minimum friction.\u003cbr\u003e\n Stage 2 - Under heavy loads, where deformation of ball bearings alone would result in increased friction, a sliding Acetal bearing on a polished stainless steel race takes over, maintaining low friction performance.\u003cbr\u003e\n Additionally the ball bearings are configured to act as a thrust bearing between the sheave and cheeks, preventing the sheave from rubbing on the cheeks and causing friction when the line lead in and out of the block isn't perfect. Particularly important for cheek blocks.\u003c\/p\u003e\n  \n \u003cp\u003e\u003cb\u003eAlloy cheek plates\u003c\/b\u003e\u003cbr\u003e\n Block cheeks are manufactured from the highest quality alloy for maximum strength. Material optimisation and the cut-away design minimises weight and allows easy fresh water rinsing of salt and debris from the bearings. Cheek design has been further styled with flaring at the block throat and reduced gap between the cheek and sheave, minimising rope wear.\u003c\/p\u003e\n  \n \u003cp\u003e\u003cb\u003eApplications\u003c\/b\u003e\u003c\/p\u003e\n \u003cul\u003e \u003cli\u003eIdeal for mainsheet, halyard and spinnaker sheet applications on boats to 11m (36ft).\u003c\/li\u003e\n \u003cli\u003eVarious control line applications on larger yachts.\u003c\/li\u003e\n \u003cli\u003eAlloy sheave models are available for use with wire. \u003c\/li\u003e\n \u003c\/ul\u003e\u003cp\u003e Our Part # RONRF64523 | Mfr. Part # RF64523\u003c\/p\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":49348833247538,"sku":"RONRF64523","price":344.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0879\/4908\/2930\/files\/RONRF64523.jpg?v=1735835654"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0879\/4908\/2930\/collections\/download_65ef7e56-1dcd-4a25-a62f-cf7f806698c3.jpg?v=1736786626","url":"https:\/\/www.mauripro.com\/collections\/ronstan-sailboat-fiddle-blocks.oembed?page=2","provider":"MAURIPRO","version":"1.0","type":"link"}