{"title":"Tie-On Ball Bearing Blocks for Dinghies","description":"\u003cp\u003eSeldén tie-on ball bearing blocks in 30 mm, 40 mm and 60 mm sheave sizes for dinghy booms, mast bases and other lashing points where a lightweight articulating block fit is preferred over a fixed shackle mounting.\u003c\/p\u003e\n\u003ch2\u003eHow to choose\u003c\/h2\u003e\n\u003cp\u003eA tie-on block attaches directly to a fitting point with a lashing rather than a shackle. This gives a tighter, lighter, more articulating fit than a shackle-mounted block, and eliminates a metal swivel and shackle from the assembly. The block sits close to its attachment point and moves naturally with the load direction. The recommended lashing method for the BBB30 tie-on is three turns of 2 mm line.\u003c\/p\u003e\n\u003cp\u003eChoose sheave size to match your line diameter. The BBB30 tie-on suits lines up to 8 mm for control lines and lighter mainsheet applications on smaller dinghies. The BBB40 tie-on suits lines up to 10 mm for mainsheets and spinnaker systems on two-handed boats. The BBB60 tie-on also suits lines up to 10 mm and steps up to Delrin ball bearings for higher loads on larger dinghies and keelboats.\u003c\/p\u003e\n\u003cp\u003eFor the BBB60 size, a heavy duty version is available with stainless steel ball bearing races and Acetal bearing cages. Choose the heavy duty version where loads are high and sustained, such as on a loaded mainsheet system or spinnaker sheet on a performance keelboat.\u003c\/p\u003e\n\n\u003ch2\u003eWhat's in this collection\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eBBB30 single tie-on\u003c\/strong\u003e (403-101-08R) suits lines up to 8 mm with stainless steel ball bearings and glass fibre reinforced polyamide sheave and cheeks. The recommended attachment is three turns of 2 mm lashing line.\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eBBB40 single tie-on\u003c\/strong\u003e (404-101-16R) suits lines up to 10 mm with stainless steel ball bearings and glass fibre reinforced cheeks. Attaches by lashing to the fitting point without a shackle.\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eBBB60 single tie-on\u003c\/strong\u003e (406-601-14R) suits lines up to 10 mm with Delrin ball bearings and glass fibre reinforced cheeks for dynamic mainsheet and sheet applications on larger boats.\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eBBB60 single tie-on heavy duty\u003c\/strong\u003e (406-601-64R) adds stainless steel ball bearing races and Acetal bearing cages for higher sustained loads. Construction and line size are otherwise the same as the standard BBB60 tie-on.\u003c\/p\u003e","products":[{"product_id":"30-mm-ball-bearing-block-single-tie-on","title":"30 mm Ball Bearing Block - Single, Tie-On","description":"\u003cp\u003eThe BBB30 Tie-On Block is a 30mm ball bearing block that is tied on to a dinghy boom or to any other fixing point. The idea with this block is to save weight and to get a tight but yet articulating fit. \u003c\/p\u003e\u003cp\u003eThe block features stainless steel ball bearings for strength and smooth rotation and glass fiber reinforced polyamide sheave and cheeks. Acetal bearing cage to prevent ball-to-ball friction and to reduce weight. \u003c\/p\u003e\u003cp\u003e\u003cb\u003eSafe working Load\u003c\/b\u003e: 200 \u003cem\u003ekg\u003c\/em\u003e\u003cbr\u003e\u003cb\u003eBreaking Load\u003c\/b\u003e: 400 \u003cem\u003ekg\u003c\/em\u003e\u003cbr\u003e\u003cb\u003eMax line size\u003c\/b\u003e: 8 \u003cem\u003emm\u003c\/em\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Selden Dinghy Store","offers":[{"title":"Default Title","offer_id":52013404488018,"sku":"403-101-08R","price":18.5,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0993\/1325\/4738\/files\/index_2b3a052f-873e-4b66-9e42-b0d34c2bc146.jpg?v=1763034797"},{"product_id":"40-mm-ball-bearing-block-single-tie-on","title":"40 mm Ball Bearing Block - Single, Tie-On","description":"\u003cp\u003eThe BBB40 Tie-On Block is a lightweight and flexible 40 mm ball bearing block designed for dynamic applications under medium loads. It is tied directly to rigging points, eliminating the need for shackles.\u003c\/p\u003e\u003cp\u003eStainless steel ball bearings provide smooth, low-friction performance, and glass fiber reinforced cheeks ensure durability. Ideal for moderate and dynamic loads with minimal friction.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eSafe working Load\u003c\/b\u003e: 250 \u003cem\u003ekg\u003c\/em\u003e\u003cbr\u003e\u003cb\u003eBreaking Load\u003c\/b\u003e: 500 \u003cem\u003ekg\u003c\/em\u003e\u003cbr\u003e\u003cb\u003eMax line size\u003c\/b\u003e: 10 \u003cem\u003emm\u003c\/em\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Selden Dinghy Store","offers":[{"title":"Default Title","offer_id":52013451673938,"sku":"404-101-16R","price":32.17,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0993\/1325\/4738\/files\/index_14f874a3-48e3-4b5c-a556-bd32a4e679e9.jpg?v=1763034907"},{"product_id":"60-mm-ball-bearing-block-single-tie-on","title":"60 mm Ball Bearing Block - Single, Tie-On","description":"\u003cp\u003eThe BBB60 Tie-On Block offers a lightweight and flexible rigging option with a 60 mm sheave and Delrin ball bearings for reduced friction. Designed to be tied directly onto a rigging point, it eliminates the need for a shackle.\u003c\/p\u003e\u003cp\u003eGlass fiber reinforced cheeks provide strength and durability, making it ideal for use in mainsail, genoa, and spinnaker sheet systems.\u003c\/p\u003e\u003cp\u003ePerfect for applications requiring high articulation and lightweight performance.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eSafe working Load\u003c\/b\u003e: 350 \u003cem\u003ekg\u003c\/em\u003e\u003cbr\u003e\u003cb\u003eBreaking Load\u003c\/b\u003e: 700 \u003cem\u003ekg\u003c\/em\u003e\u003cbr\u003e\u003cb\u003eMax line size\u003c\/b\u003e: 10 \u003cem\u003emm\u003c\/em\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Selden Dinghy Store","offers":[{"title":"Default Title","offer_id":52013500072274,"sku":"406-601-14R","price":45.34,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0993\/1325\/4738\/files\/index_91f751d3-ce83-4661-814f-a789976b2748.jpg?v=1763035067"},{"product_id":"60-mm-ball-bearing-block-single-tie-on-heavy-duty","title":"60 mm Ball Bearing Block - Single, Tie-On, Heavy Duty","description":"\u003cp\u003eThe BBB60 Tie-On Heavy Duty Block offers maximum flexibility and strength for rigging systems. \u003c\/p\u003e\u003cp\u003eThe 60 mm sheave is supported by stainless steel ball bearings and stainless ballbearing races, reducing friction and enhancing durability. Acetal bearing cages to prevent ball-to-ball friction and to reduce weight. \u003c\/p\u003e\u003cp\u003eThe glass fiber reinforced cheeks ensure long-term durability and resistance to wear. This block is ideal for dynamic use, offering tie-on convenience without the need for shackles.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eSafe working Load\u003c\/b\u003e: 500 \u003cem\u003ekg\u003c\/em\u003e\u003cbr\u003e\u003cb\u003eBreaking Load\u003c\/b\u003e: 1000 \u003cem\u003ekg\u003c\/em\u003e\u003cbr\u003e\u003cb\u003eMax line size\u003c\/b\u003e: 10 \u003cem\u003emm\u003c\/em\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Selden Dinghy Store","offers":[{"title":"Default Title","offer_id":52013502464338,"sku":"406-601-64R","price":63.9,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0993\/1325\/4738\/files\/index_3761776e-e991-4f04-b299-f84a8b5b01e9.jpg?v=1763035084"}],"url":"https:\/\/dinghy.seldenmast.com\/collections\/tie-on-ball-bearing-blocks.oembed","provider":"Seldén Dinghy Store","version":"1.0","type":"link"}