{"id":73569,"date":"2026-11-10T16:44:30","date_gmt":"2026-11-10T15:44:30","guid":{"rendered":"https:\/\/shopandsail.com\/?post_type=product&#038;p=73569"},"modified":"2026-11-10T16:56:46","modified_gmt":"2026-11-10T15:56:46","slug":"5t-harken-opening-block-with-loop","status":"publish","type":"product","link":"https:\/\/shopandsail.com\/en\/shop\/fittings-en\/blocks\/ball-bearing-blocks-en\/5t-harken-opening-block-with-loop\/","title":{"rendered":"5T Harken opening block with loop"},"content":{"rendered":"<div>\n<div><strong>The Harken 3300 opening block<\/strong> is an essential piece of equipment on board sailing boats. It allows you to guide or deflect a sheet, as well as make adjustments to a static line. <strong>Its opening design<\/strong> makes it easy to temporarily install on your rigging without having to dismantle the entire rope system.<\/div>\n<div><\/div>\n<div>\n<p><strong>The pivoting side plates<\/strong> make installation quick and easy. The strop is fixed on one side and can be released on the other, allowing the block to be fitted around the rope. <strong>A Velcro\u00ae fastening strap<\/strong>, permanently attached to one of the side plates, keeps the block securely closed once the plates are aligned. <strong>Its wide reflective tab<\/strong> makes it easy to handle, even when wearing gloves.<\/p>\n<p>The block features<strong> Harken&#8217;s ULC (Ultra Light Composite) technology<\/strong>, ensuring smooth sheave rotation and efficient performance under demanding conditions. <strong>The Torlon\u00ae ball bearings<\/strong>, fitted with <strong>Snap-fit cages<\/strong>, are designed to withstand lateral loads. An integrated spacer prevents the hardcoat anodised, PTFE-treated aluminium side plates from binding.<\/p>\n<p><strong>With its 56 mm sheave<\/strong>, this block accommodates ropes up to <strong>16 mm in diameter<\/strong>.<\/p>\n<h5>Technical specifications of the Harken 5T opening block with loop:<\/h5>\n<ul>\n<li>\n<div>\n<div>\n<p>Brand: Harken<\/p>\n<\/div>\n<\/div>\n<\/li>\n<li>\n<div>\n<div>\n<p>Model: Opening block with loop<\/p>\n<\/div>\n<\/div>\n<\/li>\n<li>\n<div>\n<div>\n<p>Manufacturer reference: 3300<\/p>\n<\/div>\n<\/div>\n<\/li>\n<li>\n<div>\n<div>\n<p>Sheave diameter: 56 mm<\/p>\n<\/div>\n<\/div>\n<\/li>\n<li>\n<div>\n<div>\n<p>Length: 86 mm<\/p>\n<\/div>\n<\/div>\n<\/li>\n<li>\n<div>\n<div>\n<p>Maximum rope diameter: 16 mm<\/p>\n<\/div>\n<\/div>\n<\/li>\n<li>\n<div>\n<div>\n<p>Maximum working load: 5,000 kg<\/p>\n<\/div>\n<\/div>\n<\/li>\n<li>\n<div>\n<div>\n<p>Breaking load: 10,000 kg<\/p>\n<\/div>\n<\/div>\n<\/li>\n<li>\n<div>\n<div>\n<p>Side plate material: Hardcoat anodised, PTFE-treated aluminium<\/p>\n<\/div>\n<\/div>\n<\/li>\n<li>\n<div>\n<div>\n<p>Bearings: Torlon\u00ae ball bearings with Snap-fit cages<\/p>\n<\/div>\n<\/div>\n<\/li>\n<li>\n<div>\n<div>\n<p>Technology: ULC composite bearing system<\/p>\n<\/div>\n<\/div>\n<\/li>\n<li>\n<div>\n<div>\n<p>Closure: Velcro\u00ae fastening strap<\/p>\n<\/div>\n<\/div>\n<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div><\/div>\n","protected":false},"excerpt":{"rendered":"<p><strong>The Harken 3300 opening block with loop<\/strong> is designed to temporarily guide or deflect a sheet on your <strong>sailboat<\/strong>. Featuring <strong>pivoting side plates<\/strong> and <strong>a Velcro\u00ae strap<\/strong>, it can be easily installed around a rope. Its<strong> 56 mm sheave and ULC composite bearing system<\/strong> ensure smooth rotation, even under heavy loads.<\/p>\n<p>Find <a href=\"https:\/\/shopandsail.com\/en\/shop\/fittings-en\/blocks\/ball-bearing-blocks-en\/harken-5t-opening-block-spare-parts\/?_gl=1*1vvsq92*_up*MQ..*_ga*MTU4NjQyMTExMC4xNzk0MzI0MjE2*_ga_68PFDG5CT7*czE3OTQzMjQyMTYkbzEkZzAkdDE3OTQzMjQyMTYkajYwJGwwJGgw\" target=\"_blank\" rel=\"noopener\">replacement parts for your Harken opening block<\/a> on our website.<\/p>\n","protected":false},"featured_media":73556,"template":"","meta":{"_acf_changed":false,"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_kad_post_transparent":"default","_kad_post_title":"","_kad_post_layout":"default","_kad_post_sidebar_id":"","_kad_post_content_style":"default","_kad_post_vertical_padding":"default","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":""},"monocoques":[],"multicoques":[1465,2800],"stock":[],"product_brand":[],"product_cat":[297,1209,1221],"product_tag":[],"product_brands":[1560],"class_list":{"0":"post-73569","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"multicoques-outremer-en","7":"multicoques-outremer-51-en","8":"product_cat-fittings-en","9":"product_cat-blocks","10":"product_cat-ball-bearing-blocks-en","11":"product_brands-harken-en","13":"first","14":"onbackorder","15":"taxable","16":"shipping-taxable","17":"purchasable","18":"product-type-simple","19":"entry","20":"content-bg","21":"loop-entry"},"bundled_by":[],"bundle_stock_status":"onbackorder","bundle_stock_quantity":0,"bundle_virtual":false,"bundle_layout":"","bundle_add_to_cart_form_location":"","bundle_editable_in_cart":false,"bundle_sold_individually_context":"","bundle_item_grouping":"","bundle_min_size":"","bundle_max_size":"","bundle_price":[],"bundled_items":[],"bundle_sell_ids":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>5T Harken opening block with loop - Shop and Sail<\/title>\n<meta name=\"description\" content=\"5-tonne Harken 3300 opening block with loop. Features a 56 mm sheave, ULC bearings and Velcro\u00ae fastening for your sailboat or catamaran.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/shopandsail.com\/en\/shop\/fittings-en\/blocks\/ball-bearing-blocks-en\/5t-harken-opening-block-with-loop\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"5T Harken opening block with loop - Shop and Sail\" \/>\n<meta property=\"og:description\" content=\"5-tonne Harken 3300 opening block with loop. 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