{"product_id":"ronstan-rf41200-series-40-double-all-purpose-block-with-full-swivel-head","title":"Ronstan RF41200 Series 40 Double All Purpose Block with Full Swivel Head","description":"\u003cb\u003eSeries 40 All Purpose Block - Double Block - Full Swivel Head\u003c\/b\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\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 swivels freely.\u003cbr\u003e\u003c\/p\u003e\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003cbr\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 sheave\u003c\/li\u003e\n\u003cli\u003eSlotted pin shackle eliminates fouled lines\u003c\/li\u003e\n\u003cli\u003eTwo way head post\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eApplications:\u003c\/b\u003e\u003cbr\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eMainsheet\u003c\/li\u003e\n\u003cli\u003eHalyard\u003c\/li\u003e\n\u003cli\u003eVang\u003c\/li\u003e\n\u003cli\u003eSpinnaker control lines on off-the-beach catamarans, one design classes and sportsboats up to 8M(26')\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eMaterials:\u003c\/b\u003e\u003cbr\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eU.V. stabilized Acetal sheaves\u003c\/li\u003e\n\u003cli\u003eImpact and U.V. resistant, fiber reinforced Nylon cheeks\u003c\/li\u003e\n\u003cli\u003eGrade 316 stainless steel bearing race\u003c\/li\u003e\n\u003cli\u003eGrade 316 stainless steel load strap and head fitting\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eSpecifications:\u003c\/b\u003e\u003cbr\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eSheave : 40mm(1-9\/16\")\u003c\/li\u003e\n\u003cli\u003eMax. Rope : 10mm(7\/16\")\u003c\/li\u003e\n\u003cli\u003ePin : 5mm(3\/16\")\u003c\/li\u003e\n\u003cli\u003eM.W.L.: 600kg(1,320lbs)\u003c\/li\u003e\n\u003cli\u003eB. L.: 1,200kg(2,650lbs)\u003c\/li\u003e\n\u003cli\u003eWeight: 135g(4.8oz)\u003c\/li\u003e\n\u003c\/ul\u003e \u003c!--- cis2:m2lsl5xp ---\u003e\n\u003cp\u003e\u003cb\u003eRonstan Series 40 All Purpose Double Block with Full Swivel Head\u003c\/b\u003e is a versatile sailing hardware solution for cruising sailors, racers, and performance boats requiring dependable sheet, halyard, and control-line handling. The RF41200 combines a freely swiveling head with high working-load capability, low-maintenance construction, and durable materials for reliable service in a range of deck and rigging applications.\u003c\/p\u003e\u003cbr\u003e\u003cp\u003eSelf-lubricating Acetal polymer sheaves run on polished Grade 316 stainless steel bearing races to support both dynamic loads and high static loads. Impact- and UV-resistant, fiber-reinforced Nylon cheeks add durability, while the Grade 316 stainless steel load strap and head fitting provide a robust assembly. The slotted pin shackle helps reduce fouled lines, and the two-way head post allows the block to align effectively as loads change.\u003c\/p\u003e\u003cbr\u003e\u003cp\u003e\u003cb\u003eKey Features:\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eExceptionally high working loads for demanding sheet, halyard, and control-line applications\u003c\/li\u003e\n\u003cli\u003eFull swivel head for flexible alignment under changing loads\u003c\/li\u003e\n\u003cli\u003eSelf-lubricating Acetal sheave for low-maintenance operation\u003c\/li\u003e\n\u003cli\u003eSlotted pin shackle helps eliminate fouled lines\u003c\/li\u003e\n\u003cli\u003eDurable UV-stabilized, impact-resistant materials for cruising and racing use\u003c\/li\u003e\n\u003cli\u003eTwo-way head post supports versatile rigging configurations\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cp\u003e\u003cb\u003eProduct Details:\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBrand: Ronstan\u003c\/li\u003e\n\u003cli\u003eModel: RF41200\u003c\/li\u003e\n\u003cli\u003eSeries: 40\u003c\/li\u003e\n\u003cli\u003eBlock type: Double all purpose block with full swivel head\u003c\/li\u003e\n\u003cli\u003eSheave: 1-9\/16 inches\u003c\/li\u003e\n\u003cli\u003eMaximum rope size: 7\/16 inch\u003c\/li\u003e\n\u003cli\u003ePin size: 3\/16 inch\u003c\/li\u003e\n\u003cli\u003eMaximum working load: 1,320 pounds\u003c\/li\u003e\n\u003cli\u003eBreaking load: 2,650 pounds\u003c\/li\u003e\n\u003cli\u003eWeight: 4.8 ounces\u003c\/li\u003e\n\u003cli\u003eApplications: Mainsheets, halyards, vangs, and spinnaker control lines on off-the-beach catamarans, one-design classes, and sportsboats up to 26 feet\u003c\/li\u003e\n\u003cli\u003eMaterials: UV-stabilized Acetal sheaves, impact- and UV-resistant fiber-reinforced Nylon cheeks, and Grade 316 stainless steel bearing race, load strap, and head fitting\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eChoose the Ronstan RF41200 Series 40 Double All Purpose Block for durable, adaptable performance in sailing systems where smooth operation and dependable load handling matter.\u003c\/p\u003e\u003cbr\u003e\u003cp\u003e\u003cb\u003eSEO Meta Description:\u003c\/b\u003e Shop the Ronstan RF41200 Series 40 double block with full swivel head, self-lubricating sheave, and durable construction for sailing control lines.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\u003cli\u003eDouble all purpose block with full swivel head for flexible sailing-system alignment\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eSelf-lubricating Acetal sheave runs on a polished Grade 316 stainless steel bearing race\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eSupports a maximum working load of 1,320 pounds and a breaking load of 2,650 pounds\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eSlotted pin shackle helps prevent fouled lines\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eUV-stabilized and impact-resistant materials support long service life\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eDesigned for mainsheets, halyards, vangs, and spinnaker control lines\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":44881686921305,"sku":"65757","price":67.97,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0623\/1818\/2489\/files\/65757XL.jpg?v=1789194439","url":"https:\/\/www.marinepartsonly.com\/products\/ronstan-rf41200-series-40-double-all-purpose-block-with-full-swivel-head","provider":"Marine Parts Only","version":"1.0","type":"link"}