{"title":"Double Blocks for Dinghies","description":"\u003cp\u003eSeldén double blocks for dinghy purchase systems, mainsheets and control lines, available in standard ball bearing (BBB), high load ball bearing (BBB25) and soft attachment (S-series) versions from 20 mm to 60 mm sheave diameter.\u003c\/p\u003e\n\u003ch2\u003eHow to choose\u003c\/h2\u003e\n\u003cp\u003eA double block carries two sheaves in a single body, making it the core component of any purchase system. Whether you are building a mainsheet tackle, a kicker, a vang or a control line purchase, the double block is where the mechanical advantage is created. This collection covers three types: standard ball bearing blocks (BBB), high load ball bearing blocks and soft attachment blocks.\u003c\/p\u003e\n\u003cp\u003eStandard ball bearing blocks use stainless steel ball bearings and glass fibre reinforced polyamide sheaves. They suit the majority of dinghy and keelboat purchase applications and are available in four sizes. Choose the size to match your line: BBB20 for lines up to 6 mm, BBB30 for lines up to 8 mm, BBB40 and BBB60 for lines up to 10 mm.\u003c\/p\u003e\n\u003cp\u003eThe BBB25 high load block is a specialist option with an all-stainless construction rated for wire and rope up to 5 mm. It is compact but strong, suited to halyards, tackles and applications where load is high relative to line diameter.\u003c\/p\u003e\n\u003cp\u003eSoft attachment blocks (S20, S30, S40) mount with a Dyneema lashing rather than a shackle. They are lighter, eliminate metal-on-metal contact at the attachment point, and reduce snagging points on deck. The S20 double accepts lashing up to ø4 mm. The S30 double takes 2 mm Dyneema lashing, not included. Soft attachment versions suit applications where saving weight and keeping a clean deck profile matters.\u003c\/p\u003e\n\u003cp\u003eThe becket variant adds a fixed attachment point on the block body where the standing end of a purchase system is anchored. If you are building a 2:1 or higher purchase you need a becket on the double block. If the standing end is anchored elsewhere, the standard version without becket is sufficient.\u003c\/p\u003e\n\u003cp\u003eThe BBB60 double is the only swivel-mounting double in this collection, suited to mainsheets and sheets on larger dinghies and keelboats where the lead angle changes and a fixed attachment would create misalignment.\u003c\/p\u003e\n\n\u003ch2\u003eWhat's in this collection\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eBBB20 ball bearing doubles\u003c\/strong\u003e cover lines up to 6 mm and include a standard double with stainless strap (402-101-03R), a becket version (402-101-04R) and a through-deck lead double that mounts with 2xM4 screws (402-101-18). The \u003cstrong\u003eS20 soft attachment double\u003c\/strong\u003e (402-101-61R) uses Acetal sheaves with stainless ball bearings and accepts lashing up to ø4 mm.\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eBBB25 high load doubles\u003c\/strong\u003e cover wire and rope up to 5 mm with all-stainless construction and ball cages to reduce friction and weight. Available as a standard strap double (402-201-08R) and a becket strap version (402-201-09R).\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eBBB30 ball bearing doubles\u003c\/strong\u003e cover lines up to 8 mm and include a standard double with stainless eye (403-101-04R) and a becket version (403-101-05R), both with glass fibre reinforced polyamide sheaves and Acetal bearing cages. The \u003cstrong\u003eS30 soft attachment double\u003c\/strong\u003e (403-101-61R) uses Acetal sheaves with stainless ball bearings; 2 mm Dyneema lashing is recommended but not supplied.\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eBBB40 ball bearing doubles\u003c\/strong\u003e cover lines up to 10 mm with a fixed stainless eye, available as a standard double (404-101-06R) and a becket double (404-101-07R). The \u003cstrong\u003eS40 soft attachment double\u003c\/strong\u003e (404-101-61R) has two 40 mm sheaves with stainless ball bearings for dynamic loads up to 10 mm.\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eBBB60 double swivel\u003c\/strong\u003e (406-601-05R) has two 60 mm sheaves with Delrin ball bearings for high dynamic loads up to 10 mm line. The swivel shackle locks at 0° or 90° via a plastic washer swivel lock.\u003c\/p\u003e","products":[{"product_id":"20-mm-ball-bearing-block-double","title":"20 mm Ball Bearing Block - Double","description":"\u003cp\u003eThe Seldén BBB20 Double Ball Bearing Block is designed for trim lines on dinghies and keelboats. Made with stainless steel ball bearings and glass fiber reinforced polyamide, it offers high strength and low friction. Can be attached with shackle or line.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eSafe working Load\u003c\/b\u003e: 300 \u003cem\u003ekg\u003c\/em\u003e\u003cbr\u003e\u003cb\u003eBreaking Load\u003c\/b\u003e: 600 \u003cem\u003ekg\u003c\/em\u003e\u003cbr\u003e\u003cb\u003eMax line size\u003c\/b\u003e: 6 \u003cem\u003emm\u003c\/em\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Selden Dinghy Store","offers":[{"title":"Default Title","offer_id":52013367066962,"sku":"402-101-03R","price":41.02,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0993\/1325\/4738\/files\/index_eadc2852-39b9-4e68-99b9-3c12b0b9d81b.jpg?v=1763034694"},{"product_id":"20-mm-ball-bearing-block-double-becket","title":"20 mm Ball bearing Block - Double, Becket","description":"\u003cp\u003eThe Seldén BBB20 Double\/Becket block is a 20mm ball bearing block. Made with stainless steel ball bearings and glass fiber reinforced polyamide, it is lightweight yet strong. Use for control lines on dinghies and keelboats. Can be attached with shackle or line.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eSafe working Load\u003c\/b\u003e: 300 \u003cem\u003ekg\u003c\/em\u003e\u003cbr\u003e\u003cb\u003eBreaking Load\u003c\/b\u003e: 600 \u003cem\u003ekg\u003c\/em\u003e\u003cbr\u003e\u003cb\u003eMax line size\u003c\/b\u003e: 6 \u003cem\u003emm\u003c\/em\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Selden Dinghy Store","offers":[{"title":"Default Title","offer_id":52013369852242,"sku":"402-101-04R","price":43.4,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0993\/1325\/4738\/files\/index_bfaa1eae-00fb-4298-8fed-daa5f7358fd4.jpg?v=1763034697"},{"product_id":"20-mm-ball-bearing-block-double-through-deck-lead","title":"20 mm Ball Bearing Block - Double, Through-Deck Lead","description":"\u003cp\u003eThe BBB20 Double TD block is a 20mm ball bearing block designed for leading a line through a deck or coaming. It features stainless steel ball bearings for smooth rotation and low friction. Ideal for control lines on dinghies and keelboats. \u003c\/p\u003e\u003cp\u003e\u003cb\u003eBlockType\u003c\/b\u003e: td,double \u003cem\u003e\u003c\/em\u003e\u003cbr\u003e\u003cb\u003eSubType\u003c\/b\u003e: td double \u003cem\u003e\u003c\/em\u003e\u003cbr\u003e\u003cb\u003eBreaking Load\u003c\/b\u003e: 200 \u003cem\u003ekg\u003c\/em\u003e\u003cbr\u003e\u003cb\u003eSafe working Load\u003c\/b\u003e: 100 \u003cem\u003ekg\u003c\/em\u003e\u003cbr\u003e\u003cb\u003eSystem\u003c\/b\u003e: BBB20 \u003cem\u003e\u003c\/em\u003e\u003cbr\u003e\u003cb\u003eMax line size\u003c\/b\u003e: 6 \u003cem\u003emm\u003c\/em\u003e\u003cbr\u003e\u003cb\u003eMounting\u003c\/b\u003e: 2xM4 \u003cem\u003e\u003c\/em\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Selden Dinghy Store","offers":[{"title":"Default Title","offer_id":52013385777490,"sku":"402-101-18","price":31.58,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0993\/1325\/4738\/files\/index_786adcad-d167-4b28-9137-8e0e22527b89.jpg?v=1763034727"},{"product_id":"20-mm-s20-soft-attachment-block-double-soft-attachment","title":"20 mm S20 Soft Attachment Block - Double, Soft Attachment","description":"\u003cp\u003eThe S20 Soft Attachment Double Block is a high-quality, lightweight block with a low-friction design. It features Acetal sheaves and ball bearings in stainless steel. Ideal for trim lines on smaller boats in racing conditions. Easy to install with lashing up to Ø4 mm. \u003c\/p\u003e\u003cp\u003eIdeal for trim lines on smaller boats in racing conditions when a strong, tight, silent and flexible attachment is desired.  \u003c\/p\u003e\u003cp\u003e\u003cb\u003eSafe working Load\u003c\/b\u003e: 150 \u003cem\u003ekg\u003c\/em\u003e\u003cbr\u003e\u003cb\u003eBreaking Load\u003c\/b\u003e: 300 \u003cem\u003ekg\u003c\/em\u003e\u003cbr\u003e\u003cb\u003eMax line size\u003c\/b\u003e: 6 \u003cem\u003emm\u003c\/em\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Selden Dinghy Store","offers":[{"title":"Default Title","offer_id":52013386105170,"sku":"402-101-61R","price":35.33,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0993\/1325\/4738\/files\/index_2432cada-a1d1-40b9-88f3-37788bc58dda.jpg?v=1763034731"},{"product_id":"25-mm-high-load-ball-bearing-block-double-strap","title":"25 mm High Load Ball Bearing Block - Double, Strap","description":"\u003cp\u003eThe BBB25 Double Becket Block is a 25mm high load ball bearing block designed for dynamic loads on smaller boats. It is ideal for use with wire and rope up to 5mm in diameter, perfect for rigging control lines, halyards and tackles. The stainless steel construction provides high strength and rigidity, with a row of stainless steel bearings for smooth operation. Ball cages to reduce ball-to-ball friction and weight. \u003c\/p\u003e\u003cp\u003e\u003cb\u003eSafe working Load\u003c\/b\u003e: 400 \u003cem\u003ekg\u003c\/em\u003e\u003cbr\u003e\u003cb\u003eBreaking Load\u003c\/b\u003e: 800 \u003cem\u003ekg\u003c\/em\u003e\u003cbr\u003e\u003cb\u003eMax line size\u003c\/b\u003e: 5 \u003cem\u003emm\u003c\/em\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Selden Dinghy Store","offers":[{"title":"Default Title","offer_id":52013392560466,"sku":"402-201-08R","price":45.56,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0993\/1325\/4738\/files\/index_991b8eec-0a32-4d75-80db-e14205c7e0f8.jpg?v=1763034763"},{"product_id":"25-mm-high-load-ball-bearing-block-double-becket-strap","title":"25 mm High Load Ball Bearing Block - Double, Becket, Strap","description":"\u003cp\u003eThe BBB25 Double Becket Block is a 25mm high load ball bearing block designed for dynamic loads on smaller boats. It is ideal for use with wire and rope up to 5mm in diameter, perfect for rigging control lines, halyards and tackles. The stainless steel construction provides high strength and rigidity, with a row of stainless steel bearings for smooth operation. Ball cages to reduce ball-to-ball friction and weight. \u003c\/p\u003e\u003cp\u003e\u003cb\u003eSafe working Load\u003c\/b\u003e: 400 \u003cem\u003ekg\u003c\/em\u003e\u003cbr\u003e\u003cb\u003eBreaking Load\u003c\/b\u003e: 800 \u003cem\u003ekg\u003c\/em\u003e\u003cbr\u003e\u003cb\u003eMax line size\u003c\/b\u003e: 5 \u003cem\u003emm\u003c\/em\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Selden Dinghy Store","offers":[{"title":"Default Title","offer_id":52013392626002,"sku":"402-201-09R","price":51.5,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0993\/1325\/4738\/files\/index_96c31be7-4e0e-4148-bb75-116cfda27545.jpg?v=1763034760"},{"product_id":"30-mm-ball-bearing-block-double","title":"30 mm Ball Bearing Block - Double","description":"\u003cp\u003eThe BBB30 Double Block is a 30mm ball bearing block with a stainless attachment eye. \u003c\/p\u003e\u003cp\u003eThe block features stainless steel ball bearings for strength and smooth rotation and glass fiber reinforced polyamide sheaves and cheeks. Acetal bearing cage to prevent ball-to-ball friction and to reduce weight. Ideal for moderate and dynamic loads with minimal friction.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eSafe working Load\u003c\/b\u003e: 400 \u003cem\u003ekg\u003c\/em\u003e\u003cbr\u003e\u003cb\u003eBreaking Load\u003c\/b\u003e: 800 \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":52013398229330,"sku":"403-101-04R","price":53.4,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0993\/1325\/4738\/files\/index_81bb33c6-85e1-4a14-905a-ed8c1d6587b6.jpg?v=1763034780"},{"product_id":"30-mm-ball-bearing-block-double-becket","title":"30 mm Ball Bearing Block - Double, Becket","description":"\u003cp\u003eThe BBB30 Double Becket Block is a 30mm ball bearing block with a stainless attachment eye. \u003c\/p\u003e\u003cp\u003eThe block features stainless steel ball bearings for strength and smooth rotation and glass fiber reinforced polyamide sheaves and cheeks. Acetal bearing cage to prevent ball-to-ball friction and to reduce weight. Ideal for moderate and dynamic loads with minimal friction.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eSafe working Load\u003c\/b\u003e: 400 \u003cem\u003ekg\u003c\/em\u003e\u003cbr\u003e\u003cb\u003eBreaking Load\u003c\/b\u003e: 800 \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":52013398262098,"sku":"403-101-05R","price":56.81,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0993\/1325\/4738\/files\/index_d46f32e6-815c-4c51-a57c-9e47b67f2d01.jpg?v=1763034782"},{"product_id":"30-mm-s30-soft-attachment-block-double-soft-attachment","title":"30 mm S30 Soft Attachment Block - Double, Soft Attachment","description":"\u003cp\u003eThe S30 Double Soft Attachment Block is a high-quality, lightweight block with a low-friction design. It features an Acetal sheave and ball bearings in stainless steel. 2 mm Dyneema line is recommended for attaching the block. Not included.\u003c\/p\u003e\u003cp\u003eIdeal for trim lines on smaller boats in racing conditions when a strong, tight, silent and flexible attachment is desired.  \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":52013423591762,"sku":"403-101-61R","price":41.57,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0993\/1325\/4738\/files\/index_61783c5a-f38a-490a-8eb9-cd4dcf6af754.jpg?v=1763034830"},{"product_id":"40-mm-ball-bearing-block-double","title":"40 mm Ball Bearing Block - Double","description":"\u003cp\u003eThe BBB40 Double Block features two 40 mm sheaves, designed for dynamic applications under medium loads. The stainless eye is fixed and allows for shackle- or line attachments.\u003c\/p\u003e\u003cp\u003eStainless steel ball bearings ensure smooth, low-friction operation, while glass fiber reinforced cheeks provide strength and durability. Ideal for moderate and dynamic loads with minimal friction.\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":52013437387090,"sku":"404-101-06R","price":94.21,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0993\/1325\/4738\/files\/index_44714919-5491-4879-b7fe-4b555f77a266.jpg?v=1763034863"},{"product_id":"40-mm-ball-bearing-block-double-becket","title":"40 mm Ball Bearing Block - Double, Becket","description":"\u003cp\u003eThe BBB40 Double Becket Block is a 40 mm ball bearing block with two sheaves and a becket for additional rigging options. The stainless eye is fixed and allows for shackle- or line attachments. \u003c\/p\u003e\u003cp\u003eThe block's stainless steel ball bearings reduce friction under dynamic loads, while the glass fiber reinforced cheeks enhance strength and durability. Ideal for moderate and dynamic loads with minimal friction.\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":52013445349714,"sku":"404-101-07R","price":100.15,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0993\/1325\/4738\/files\/index_5272a484-a354-4cd4-bfe0-cce5017c6f9d.jpg?v=1763034882"},{"product_id":"40-mm-s40-soft-attachment-block-double-soft-attachment","title":"40 mm S40 Soft Attachment Block - Double, Soft Attachment","description":"\u003cp\u003eThe S40 Double Soft Attachment Block features two 40 mm sheaves, designed for high-performance rigging under dynamic loads. Stainless steel ball bearings ensure smooth, friction-free operation, while the soft attachment system allows for secure and flexible rigging.\u003c\/p\u003e\u003cp\u003eIdeal for trim lines on smaller boats in racing conditions when a strong, tight, silent and flexible attachment is desired.  \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":52013457572178,"sku":"404-101-61R","price":59.23,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0993\/1325\/4738\/files\/index_7cd5223e-1f3b-4c89-b2c4-e7457b079a0d.jpg?v=1763034934"},{"product_id":"60-mm-ball-bearing-block-double-swivel","title":"60 mm Ball Bearing Block - Double, Swivel","description":"\u003cp\u003eThe BBB60 Double Block features two 60 mm sheaves optimized for high dynamic loads.\u003c\/p\u003e\u003cp\u003eA plastic washer acts as a swivel lock between the block body and shackle, allowing the shackle to be fixed at either 0° or 90°.\u003c\/p\u003e\u003cp\u003eGlass fiber reinforced cheeks and Delrin ball bearings offer smooth, low-friction performance, making this block ideal for sheets and control lines.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eSafe working Load\u003c\/b\u003e: 700 \u003cem\u003ekg\u003c\/em\u003e\u003cbr\u003e\u003cb\u003eBreaking Load\u003c\/b\u003e: 1400 \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":52013493551442,"sku":"406-601-05R","price":132.67,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0993\/1325\/4738\/files\/index_324ccbb2-7e3f-42ca-84ca-4177ab280b95.jpg?v=1763035041"}],"url":"https:\/\/dinghy.seldenmast.com\/collections\/double.oembed","provider":"Seldén Dinghy Store","version":"1.0","type":"link"}