{"product_id":"seasure-25mm-double-block-w-becket-00-23crd","title":"SeaSure 25mm Double Block w\/Becket","description":"\u003cp class=\"nvn-hero\"\u003eThe SeaSure 25mm double block with becket is one of their oldest, best-selling sailing blocks, and it earns that spot. Marine-grade stainless side plates, an Arnite plastic sheave on a plain bearing, and a becket so you can dead-end a line and build real purchase. Handles rope up to 8mm with a 1000kg breaking load.\u003c\/p\u003e\n\n\u003cdiv class=\"nvn-description\"\u003e\n\u003cp\u003eIf you've rigged a dinghy or a small keelboat, you already know these little SeaSure blocks. The 25mm plain-bearing range has been around forever because it just works. Stainless steel side plates and rivets, an Arnite plastic sheave that's hard-wearing and light, and a becket on the bottom cheek so you can tie off the standing end of your line.\u003c\/p\u003e\n\u003cp\u003eThat becket is the whole point of this one. It lets you dead-end a line right at the block, so you can build a 4:1 or 5:1 purchase without adding another block. Handy for kicking straps, outhauls, cunninghams, and cabin-top control lines where you need mechanical advantage in a tight spot.\u003c\/p\u003e\n\u003cp\u003eIt takes rope up to 8mm and carries a 1000kg breaking load, so it isn't just a sailing part. Folks reach for these on lifting rigs, garage-door setups, and light hoisting jobs too. The plain bearing is happiest under steady load rather than fast, repeated sheeting, but for control lines it runs smooth and lasts.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul class=\"nvn-features\"\u003e\n  \u003cli\u003eBecket on the bottom cheek lets you dead-end a line and build a 4:1 or 5:1 purchase without a second block\u003c\/li\u003e\n  \u003cli\u003eArnite plastic sheave on a plain bearing runs smooth under load and shrugs off UV and salt\u003c\/li\u003e\n  \u003cli\u003eMarine-grade stainless steel side plates and rivets stand up to a wet, salty life on deck\u003c\/li\u003e\n  \u003cli\u003eTakes rope up to 8mm with a 1000kg breaking load, enough for control lines and light hoisting\u003c\/li\u003e\n  \u003cli\u003eCompact 25mm sheave keeps weight and clutter down on dinghies and small keelboats\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"nvn-trust\"\u003e\n  \u003ch2\u003eWhy Buy from NVN Marine\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eAuthorized Sea Sure reseller, full manufacturer warranty\u003c\/li\u003e\n    \u003cli\u003eNMEA member and ABYC certified, advice from real boat techs\u003c\/li\u003e\n    \u003cli\u003eSame-day shipping before 3 PM ET on in-stock items\u003c\/li\u003e\n    \u003cli\u003eNY headquarters and Fort Lauderdale flagship retail store\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"nvn-faq\"\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat's the becket for?\u003c\/summary\u003e\n    \u003cp\u003eIt's the small loop on the bottom cheek of the block. You tie the standing end of your line to it, which lets you build a 4:1 or 5:1 purchase off a single block instead of adding another one.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat size rope does it take?\u003c\/summary\u003e\n    \u003cp\u003eUp to 8mm. SeaSure lists a 1000kg breaking load for the block, so match your line and hardware to the loads you'll actually see.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs the sheave a ball bearing or plain bearing?\u003c\/summary\u003e\n    \u003cp\u003ePlain bearing. That means it's built for steady, high-load jobs like control lines and purchase systems rather than fast, repeated sheeting where a ball-bearing block shines.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat's the sheave made of?\u003c\/summary\u003e\n    \u003cp\u003eAn Arnite plastic sheave running in marine-grade stainless steel side plates. Arnite is light and hard-wearing, and the stainless holds up to salt water and spray.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eCan I use it for jobs other than sailing?\u003c\/summary\u003e\n    \u003cp\u003eYes. With an 8mm rope max and a 1000kg breaking load, boaters use these for lifting rigs, hoists, and other light mechanical-advantage setups, not just running rigging.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"nvn-specs\"\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003cth\u003eTitle\u003c\/th\u003e\n\u003ctd\u003eSeaSure 25mm Double Block w\/Becket\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eSea Sure\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003ctd\u003e00.23CRD\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eUPC\u003c\/th\u003e\n\u003ctd\u003e5036830090237\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eSheave Diameter\u003c\/th\u003e\n\u003ctd\u003e25mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBlock Type\u003c\/th\u003e\n\u003ctd\u003eDouble block with becket\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBearing Type\u003c\/th\u003e\n\u003ctd\u003ePlain bearing\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eSheave Material\u003c\/th\u003e\n\u003ctd\u003eArnite plastic\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eSide Plate Material\u003c\/th\u003e\n\u003ctd\u003eMarine-grade stainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eRivet Material\u003c\/th\u003e\n\u003ctd\u003eMarine-grade stainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eMaximum Rope Diameter\u003c\/th\u003e\n\u003ctd\u003e8mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBreaking Load\u003c\/th\u003e\n\u003ctd\u003e1000kg\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eProduct Range\u003c\/th\u003e\n\u003ctd\u003e25mm Plain Bearing Blocks\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n    \"@context\": \"https:\/\/schema.org\",\n    \"@type\": \"FAQPage\",\n    \"mainEntity\": [\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What's the becket for?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It's the small loop on the bottom cheek of the block. You tie the standing end of your line to it, which lets you build a 4:1 or 5:1 purchase off a single block instead of adding another one.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What size rope does it take?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Up to 8mm. SeaSure lists a 1000kg breaking load for the block, so match your line and hardware to the loads you'll actually see.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Is the sheave a ball bearing or plain bearing?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Plain bearing. That means it's built for steady, high-load jobs like control lines and purchase systems rather than fast, repeated sheeting where a ball-bearing block shines.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What's the sheave made of?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"An Arnite plastic sheave running in marine-grade stainless steel side plates. Arnite is light and hard-wearing, and the stainless holds up to salt water and spray.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Can I use it for jobs other than sailing?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. With an 8mm rope max and a 1000kg breaking load, boaters use these for lifting rigs, hoists, and other light mechanical-advantage setups, not just running rigging.\"\n            }\n        }\n    ]\n}\n\u003c\/script\u003e\n","brand":"Sea Sure","offers":[{"title":"Default Title","offer_id":44925502029917,"sku":"100424","price":24.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0299\/7266\/0317\/files\/100424XL.jpg?v=1787381371","url":"https:\/\/nvnmarine.com\/products\/seasure-25mm-double-block-w-becket-00-23crd","provider":"NVN Marine","version":"1.0","type":"link"}