{"title":"Ronstan Series 20 and 50 Sailing Blocks","description":"\u003cp\u003eCompare Ronstan Series 20 and Series 50 sailing blocks in the listed sheave and attachment configurations. Check line size and model-specific load information.\u003c\/p\u003e\u003cp\u003eReview the individual product dimensions, manufacturer model and included components before selecting your installation.\u003c\/p\u003e","products":[{"product_id":"ronstan-series-20-ball-bearing-block-single-55131","title":"Ronstan Series 20 Ball Bearing Block - Single MPN - RF20100","description":"\u003cb\u003eSeries 20 Ball Bearing Block - Single\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eLow friction\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eHigh static and dynamic load capacity\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eLightweight\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003ePrecision molded Acetal sheaves running on stainless steel or Torlon® ball bearings provide high performance \u0026amp; low friction\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eApplications:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eDinghy control lines\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eDinghy Vangs\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCunninghams\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eTraveller controls\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eMaterials:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eU.V. Stabilized Acetal sheaves\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eStainless steel ball bearings\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eGrade 316 stainless steel load strap and head fitting\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eImpact and UV resistant, fiber reinforced Nylon cheeks\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpecifications:\u003c\/b\u003e\u003cbr\u003e\u003cb\u003eSheave Ø:\u003c\/b\u003e\t20mm(3\/4\")\u003cbr\u003e\u003cb\u003eMax. Rope Ø:\u003c\/b\u003e\t6mm(1\/4\")\u003cbr\u003e\u003cb\u003ePin Ø:\u003c\/b\u003e 3mm(1\/8\")\u003cbr\u003e\u003cb\u003eM.W.L.:\u003c\/b\u003e\t250kg(550lbs)\u003cbr\u003e\u003cb\u003eB. L.:\u003c\/b\u003e\t550kg(1,210lbs)\u003cbr\u003e\u003cb\u003eWeight:\u003c\/b\u003e\t20g(0.7oz)","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":46385922539682,"sku":"55131","price":27.22,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0696\/3170\/5250\/files\/55131XL.jpg?v=1765315622"},{"product_id":"ronstan-series-20-ball-bearing-block-single-loop-top-55132","title":"Ronstan Series 20 Ball Bearing Block - Single - Loop Top MPN - RF20101","description":"\u003cb\u003eSeries 20 Ball Bearing Block - Single - Loop Top\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eLow friction\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eHigh static and dynamic load capacity\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eLightweight\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003ePrecision molded Acetal sheaves running on stainless steel or Torlon® ball bearings provide high performance \u0026amp; low friction\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCan be fitted with a shackle in either of two planes to allow correct alignment of the block\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eApplications:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eDinghy control lines\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eDinghy Vangs\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCunninghams\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eTraveller controls\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eMaterials:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eU.V. Stabilized Acetal sheaves\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eStainless steel ball bearings\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eGrade 316 stainless steel load strap and head fitting\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eImpact and UV resistant, fiber reinforced Nylon cheeks\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e=\u003cb\u003eSpecifications:\u003c\/b\u003e\u003cbr\u003e\u003cb\u003eSheave Ø:\u003c\/b\u003e\t20mm(3\/4\")\u003cbr\u003e\u003cb\u003eMax. Rope Ø:\u003c\/b\u003e\t6mm(1\/4\")\u003cbr\u003e\u003cb\u003eM.W.L.:\u003c\/b\u003e\t250kg(550lbs)\u003cbr\u003e\u003cb\u003eB. 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Stabilized Acetal sheaves\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eStainless steel ball bearings\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eGrade 316 stainless steel load strap and head fitting\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eImpact and UV resistant, fiber reinforced Nylon cheeks\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpecifications:\u003c\/b\u003e\u003cbr\u003e\u003cb\u003eSheave Ø:\u003c\/b\u003e\t20mm(3\/4\")\u003cbr\u003e\u003cb\u003eMax. Rope Ø:\u003c\/b\u003e\t6mm(1\/4\")\u003cbr\u003e\u003cb\u003eM.W.L.:\u003c\/b\u003e\t250kg(550lbs)\u003cbr\u003e\u003cb\u003eB. 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Stabilized Acetal sheaves\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eStainless steel ball bearings\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eGrade 316 stainless steel load strap and head fitting\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eImpact and UV resistant, fiber reinforced Nylon cheeks\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpecifications:\u003c\/b\u003e\u003cbr\u003e\u003cb\u003eSheave Ø:\u003c\/b\u003e\t20mm(3\/4\")\u003cbr\u003e\u003cb\u003eMax. Rope Ø:\u003c\/b\u003e\t6mm(1\/4\")\u003cbr\u003e\u003cb\u003eM.W.L.:\u003c\/b\u003e\t250kg(550lbs)\u003cbr\u003e\u003cb\u003eB. 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Stabilized Acetal sheaves\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eStainless steel ball bearings\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eGrade 316 stainless steel load strap and head fitting\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eImpact and UV resistant, fiber reinforced Nylon cheeks\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpecifications:\u003c\/b\u003e\u003cbr\u003e\u003cb\u003eSheave Ø:\u003c\/b\u003e\t20mm(3\/4\")\u003cbr\u003e\u003cb\u003eMax. Rope Ø:\u003c\/b\u003e\t6mm(1\/4\")\u003cbr\u003e\u003cb\u003eM.W.L.:\u003c\/b\u003e\t200kg(440lbs)\u003cbr\u003e\u003cb\u003eB. 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Stabilized Acetal sheaves\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eStainless steel ball bearings \u0026amp; Load housing\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpecifications:\u003c\/b\u003e\u003cbr\u003e\u003cb\u003eSheave Ø:\u003c\/b\u003e\t20mm(3\/4\")\u003cbr\u003e\u003cb\u003eMax. Rope Ø:\u003c\/b\u003e\t6mm(1\/4\")\u003cbr\u003e\u003cb\u003eFastener Ø:\u003c\/b\u003e 4mm(5\/32\")\u003cbr\u003e\u003cb\u003eM.W.L.:\u003c\/b\u003e\t250kg(550lbs)\u003cbr\u003e\u003cb\u003eB. 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It's so light that it needs to be lashed down!\u003cbr\u003e\u003cbr\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eIntegrated stainless steel hub to accept lashing attachment and through-sheave becket\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eSuits up to 4mm(5\/32\") lashing\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eIncludes 750mm (30\") x 1.7mm(1\/16\") diam lashing\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eApplications:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\u003cli\u003eControl lines on dinghies and catamarans to 5M(16')\u003c\/li\u003e\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eMaterials:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eSheave: High compression strength carbon acetal\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eBall bearings: stainless steel\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eFrame\/Cheeks: Nylon\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":46385924374690,"sku":"55155","price":18.15,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0696\/3170\/5250\/files\/55155XL.jpg?v=1765315648"},{"product_id":"ronstan-series-50-high-load-block-single-universal-head-55247","title":"Ronstan Series 50 High Load Block - Single - Universal Head MPN - RF50100HL","description":"\u003cb\u003eSeries 50 High Load Block - Single - Universal Head\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003eIdeal for high load applications. 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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\u003cbr\u003e\u003cbr\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eExceptionally high working loads\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eLow maintenance, long service life\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eSelf lubricating sheave\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCaptive Lock™ universal head\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eSlotted pin shackle eliminates fouled lines\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eApplications:\u003c\/b\u003e\u003cbr\u003eMainsheet and halyard applications, vang and spinnaker control lines on boats to  10M(33')\u003cbr\u003e\u003cbr\u003e\u003cb\u003eMaterials:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eNylatron® sheave\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eGrade 316 stainless steel load strap and head fitting\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eImpact and U.V. resistant, fiber reinforced Nylon cheeks\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpecifications:\u003c\/b\u003e\u003cbr\u003e\u003cb\u003eSheave Ø:\u003c\/b\u003e\t50mm(2\")\u003cbr\u003e\u003cb\u003eMax. 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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\u003cbr\u003e\u003cbr\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eExceptionally high working loads\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eLow maintenance, long service life\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eSelf lubricating sheave\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCaptive Lock™ universal head\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eSlotted pin shackle eliminates fouled lines\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eSnap fit removable becket pin\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eApplications:\u003c\/b\u003e\u003cbr\u003eMainsheet and halyard applications, vang and spinnaker control lines on boats to  10M(33')\u003cbr\u003e\u003cbr\u003e\u003cb\u003eMaterials:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eNylatron® sheave\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eGrade 316 stainless steel load strap and head fitting\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eImpact and U.V. resistant, fiber reinforced Nylon cheeks\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpecifications:\u003c\/b\u003e\u003cbr\u003e\u003cb\u003eSheave Ø:\u003c\/b\u003e\t50mm(2\")\u003cbr\u003e\u003cb\u003eMax. Rope Ø:\u003c\/b\u003e    12mm(1\/2\")\u003cbr\u003e\u003cb\u003eMax. Pin Ø:\u003c\/b\u003e 5mm(3\/16\")\u003cbr\u003e\u003cb\u003eM.W.L.:\u003c\/b\u003e\t750kg(1,650lbs)\u003cbr\u003e\u003cb\u003eB. L.:\u003c\/b\u003e\t1,500kg(3,310lbs)\u003cbr\u003e\u003cb\u003eWeight:\u003c\/b\u003e\t118g(4.1oz)\u003cbr\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":46385932042402,"sku":"55255","price":65.09,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0696\/3170\/5250\/files\/55255XL.jpg?v=1765315751"},{"product_id":"ronstan-series-50-all-purpose-block-single-stand-up-70680","title":"Ronstan Series 50 All Purpose Block - Single Stand Up MPN - RF51140","description":"\u003cp\u003e\u003cstrong\u003eSeries 50 All Purpose Block - Single Stand Up\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eExceptionally high working loads\u003c\/li\u003e\n\u003cli\u003eLow maintenance, long service life\u003c\/li\u003e\n\u003cli\u003eSelf-lubricating Acetal polymer sheave ensures low friction and extreme durability\u003c\/li\u003e\n\u003cli\u003eCaptive Lock™ universal head\u003c\/li\u003e\n\u003cli\u003eSlotted pin shackle eliminates fouled lines\u003c\/li\u003e\n\u003cli\u003eMount with 2 x 5mm (3\/6\") fasteners (not supplied)\u003c\/li\u003e\n\u003c\/ul\u003e\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. Becket pin is removable so line can be spliced prior to fitting.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eApplications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eMainsheet and halyard applications, vang and spinnaker control lines on boats to 10m (33ft)\u003c\/li\u003e\n\u003cli\u003eS60 - on boats up to 12m (40ft)\u003c\/li\u003e\n\u003cli\u003eTypically used in direct 4:1 purchase systems such as mainsheets and boom vangs\u003c\/li\u003e\n\u003cli\u003eOn larger boats they are used for fine-tune mainsheet tackles, outhauls, cunninghams, checkstays, genoa lead pullers and traveller controls.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eMaterials:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eGrade 316 stainless steel load strap\u003c\/li\u003e\n\u003cli\u003eImpact and UV resistant, fiber reinforced Nylon cheeks\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":46386370478242,"sku":"70680","price":60.91,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0696\/3170\/5250\/files\/70680XL.jpg?v=1765322609"},{"product_id":"ronstan-series-50-all-purpose-cheek-block-single-70681","title":"Ronstan Series 50 All Purpose Cheek Block - Single MPN - RF51151","description":"\u003cp\u003e\u003cstrong\u003eSeries 50 All Purpose Cheek Block - Single\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eExceptionally high working loads\u003c\/li\u003e\n\u003cli\u003eLow maintenance, long service life\u003c\/li\u003e\n\u003cli\u003eSelf-lubricating Acetal polymer sheave ensures low friction and extreme durability\u003c\/li\u003e\n\u003c\/ul\u003e\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.Can be mounted on masts and booms using the curved surface adapter. Can be stacked to create a double version, but no more than 60% of the rated working load should be applied to the upper sheave. 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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. Swivel shackle head for full 360 degree rotation (non-locking).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eExceptionally high working loads\u003c\/li\u003e\n\u003cli\u003eLow maintenance \u0026amp; long service life\u003c\/li\u003e\n\u003cli\u003eSelf-lubricating Acetal polymer sheave ensures low friction and extreme durability\u003c\/li\u003e\n\u003cli\u003eSlotted pin shackle eliminates fouled lines\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eMainsheet and halyard applications, vang and spinnaker control lines on boats to (33ft). 10m\u003c\/li\u003e\n\u003cli\u003eS60 - on boats up to 40ft, (12m)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eMaterials:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eGrade 316 stainless steel load strap\u003c\/li\u003e\n\u003cli\u003eImpact and UV resistant, fiber reinforced Nylon cheeks\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eSheave Diameter: (inch) 2\" \/ (mm) 50\u003c\/li\u003e\n\u003cli\u003eMax Rope Diameter: (inch) 1\/2\" \/ (mm) 12\u003c\/li\u003e\n\u003cli\u003ePin Diameter: (inch) 1\/4\" \/ (mm) 6\u003c\/li\u003e\n\u003cli\u003eMaximum Working Load: (lb) 2200 \/ (kg) 1000\u003c\/li\u003e\n\u003cli\u003eBreaking Load: (lb) 4410 \/ (kg) 2000\u003c\/li\u003e\n\u003cli\u003eWeight: (oz) 9.0 \/ (g) 255\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":46386370642082,"sku":"70683","price":92.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0696\/3170\/5250\/files\/70683XL.jpg?v=1765322611"},{"product_id":"ronstan-series-50-all-purpose-block-triple-70685","title":"Ronstan Series 50 All Purpose Block - Triple MPN - RF51300","description":"\u003cp\u003e\u003cstrong\u003eSeries 50 All Purpose \u003c\/strong\u003e\u003cstrong\u003eBlock - Triple\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eExceptionally high working loads\u003c\/li\u003e\n\u003cli\u003eLow maintenance, long service life\u003c\/li\u003e\n\u003cli\u003eSelf-lubricating Acetal polymer sheave ensures low friction and extreme durability\u003c\/li\u003e\n\u003cli\u003eSlotted pin shackle eliminates fouled lines\u003c\/li\u003e\n\u003cli\u003eLockable swiveling head post\u003c\/li\u003e\n\u003cli\u003eSnap fit removable becket pin\u003c\/li\u003e\n\u003c\/ul\u003e\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.Head can be locked at 0° or 90° by engaging the grub screw in either the 0 or 90 degree position.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eApplications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eMainsheet and halyard applications, vang and spinnaker control lines on boats to 10m (33ft)\u003c\/li\u003e\n\u003cli\u003eS60 - on boats up to 12m (40ft)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eMaterials:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eGrade 316 stainless steel load strap\u003c\/li\u003e\n\u003cli\u003eImpact and UV resistant, fiber reinforced Nylon cheeks\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":46386370773154,"sku":"70685","price":131.27,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0696\/3170\/5250\/files\/70685XL.jpg?v=1765322614"},{"product_id":"ronstan-series-50-all-purpose-block-fiddle-70686","title":"Ronstan Series 50 All Purpose Block - Fiddle MPN - RF51500","description":"\u003cp\u003e\u003cstrong\u003eSeries 50 All Purpose Block - Fiddle\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eExceptionally high working loads\u003c\/li\u003e\n\u003cli\u003eLow maintenance, long service life\u003c\/li\u003e\n\u003cli\u003eSelf-lubricating Acetal polymer sheave ensures low friction and extreme durability\u003c\/li\u003e\n\u003cli\u003eCaptive Lock™ universal head\u003c\/li\u003e\n\u003cli\u003eSlotted pin shackle eliminates fouled lines\u003c\/li\u003e\n\u003c\/ul\u003e\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\u003e\u003cstrong\u003eApplications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eMainsheet and halyard applications, vang and spinnaker control lines on boats to 10m (33ft)\u003c\/li\u003e\n\u003cli\u003eS60 - on boats up to 12m (40ft)\u003c\/li\u003e\n\u003cli\u003eIdeal for fine-tune mainsheet tackles, cunninghams, backstays and other control line purchase systems.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eMaterials:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eGrade 316 stainless steel load strap\u003c\/li\u003e\n\u003cli\u003eImpact and UV resistant, fiber reinforced Nylon cheeks\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":46386370904226,"sku":"70686","price":80.76,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0696\/3170\/5250\/files\/70686XL.jpg?v=1765322617"},{"product_id":"ronstan-series-50-all-purpose-block-fiddle-becket-70687","title":"Ronstan Series 50 All Purpose Block - Fiddle - Becket MPN - RF51510","description":"\u003cp\u003e\u003cstrong\u003eSeries 50 All Purpose Block - Fiddle - Becket\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eExceptionally high working loads\u003c\/li\u003e\n\u003cli\u003eLow maintenance, long service life\u003c\/li\u003e\n\u003cli\u003eSelf-lubricating Acetal polymer sheave ensures low friction and extreme durability\u003c\/li\u003e\n\u003cli\u003eCaptive Lock™ universal head\u003c\/li\u003e\n\u003cli\u003eSlotted pin shackle eliminates fouled lines\u003c\/li\u003e\n\u003cli\u003eSnap fit removable becket pin\u003c\/li\u003e\n\u003cli\u003eSpare Parts - RF51010 Replacement Becket Pin, RF150 Shackle\u003c\/li\u003e\n\u003c\/ul\u003e\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. 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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. 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low friction.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eApplications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eDinghy control lines\u003c\/li\u003e\n\u003cli\u003eDinghy vangs\u003c\/li\u003e\n\u003cli\u003eCunninghams\u003c\/li\u003e\n\u003cli\u003eTraveller controls\u003c\/li\u003e\n\u003cli\u003eDinghy barber haulers\u003c\/li\u003e\n\u003cli\u003eSpinnaker pole launching systems\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eMaterials:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eStainless Steel ball bearings\u003c\/li\u003e\n\u003cli\u003eUV stabilized Acetal sheave\u003c\/li\u003e\n\u003cli\u003eGrade 316 Stainless Steel load strap and head fitting\u003c\/li\u003e\n\u003cli\u003eImpact and UV resistant, fiber reinforced Nylon cheeks\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":46386373787810,"sku":"70786","price":46.75,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0696\/3170\/5250\/files\/70786XL.jpg?v=1765322675"},{"product_id":"ronstan-series-20-ball-bearing-block-loop-top-linked-70787","title":"Ronstan Series 20 Ball Bearing Block - Loop Top Linked MPN - RF20284","description":"\u003cp\u003e\u003cstrong\u003eSeries 20 Ball Bearing Block - Loop Top Linked\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eLow friction\u003c\/li\u003e\n\u003cli\u003eHigh static and dynamic load capacity\u003c\/li\u003e\n\u003cli\u003eLightweight\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003ePrecision molded Acetal sheaves running on stainless steel or Torlon® ball bearings provide high performance \u0026amp; low friction.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eApplications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eDinghy control lines\u003c\/li\u003e\n\u003cli\u003eDinghy vangs\u003c\/li\u003e\n\u003cli\u003eCunninghams\u003c\/li\u003e\n\u003cli\u003eTraveller controls\u003c\/li\u003e\n\u003cli\u003eDinghy barber haulers\u003c\/li\u003e\n\u003cli\u003eSpinnaker pole launching systems\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eMaterials:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eStainless Steel ball bearings\u003c\/li\u003e\n\u003cli\u003eUV stabilized Acetal sheave\u003c\/li\u003e\n\u003cli\u003eGrade 316 Stainless Steel load strap and head fitting\u003c\/li\u003e\n\u003cli\u003eImpact and UV resistant, fiber reinforced Nylon cheeks\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":46386373886114,"sku":"70787","price":34.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0696\/3170\/5250\/files\/70787XL.jpg?v=1765322677"},{"product_id":"ronstan-series-20-ball-bearing-block-single-loop-mount-70789","title":"Ronstan Series 20 Ball Bearing Block - Single, Loop Mount MPN - RF20184","description":"\u003cp\u003e\u003cstrong\u003eSeries 20 Ball Bearing Block - Single, Loop Mount\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eLow friction\u003c\/li\u003e\n\u003cli\u003eHigh static and dynamic load capacity\u003c\/li\u003e\n\u003cli\u003eLightweight\u003c\/li\u003e\n\u003cli\u003eSingle point mounting\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003ePrecision molded Acetal sheaves running on stainless steel or Torlon® ball bearings provide high performance \u0026amp; 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