{"product_id":"harken-57-mm-zircon-block","title":"Harken 57 mm Zircon Block","description":"\u003c!-- harken-official:v2 Sku:2195 page_sha256:2b636fa400b27bd683cb0ef8104b28218b955f5adf2dd39d5433024faf61ea6a --\u003e\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eZircon blocks help trimmers match sail shapes to new conditions immediately. At the core of the Zircon performance are industrial ceramic ball bearings mounted inside caged races. The cages keep these bearings separated so they don’t bunch, touch, and stop each other. The result is the most efficient small boat block Harken has ever made. Zircon blocks are available in 40- and 57-mm sheaves in single and double blocks, with or without beckets.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable style=\"border-collapse:collapse;width:100%;max-width:100%;\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth style=\"text-align:left;border-bottom:1px solid #ddd;padding:8px;\"\u003eSpecification\u003c\/th\u003e\n\u003cth style=\"text-align:left;border-bottom:1px solid #ddd;padding:8px;\"\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border-bottom:1px solid #eee;padding:8px;vertical-align:top;\"\u003eBreaking load (kg)\u003c\/td\u003e\n\u003ctd style=\"border-bottom:1px solid #eee;padding:8px;vertical-align:top;\"\u003e450 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border-bottom:1px solid #eee;padding:8px;vertical-align:top;\"\u003eBreaking load (lb)\u003c\/td\u003e\n\u003ctd style=\"border-bottom:1px solid #eee;padding:8px;vertical-align:top;\"\u003e990 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border-bottom:1px solid #eee;padding:8px;vertical-align:top;\"\u003eLength (in)\u003c\/td\u003e\n\u003ctd style=\"border-bottom:1px solid #eee;padding:8px;vertical-align:top;\"\u003e3 1\/8 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border-bottom:1px solid #eee;padding:8px;vertical-align:top;\"\u003eLength (mm)\u003c\/td\u003e\n\u003ctd style=\"border-bottom:1px solid #eee;padding:8px;vertical-align:top;\"\u003e79 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border-bottom:1px solid #eee;padding:8px;vertical-align:top;\"\u003eMaximum line Ø (in)\u003c\/td\u003e\n\u003ctd style=\"border-bottom:1px solid #eee;padding:8px;vertical-align:top;\"\u003e3\/8 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border-bottom:1px solid #eee;padding:8px;vertical-align:top;\"\u003eMaximum line Ø (mm)\u003c\/td\u003e\n\u003ctd style=\"border-bottom:1px solid #eee;padding:8px;vertical-align:top;\"\u003e10 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border-bottom:1px solid #eee;padding:8px;vertical-align:top;\"\u003eMaximum working load (kg)\u003c\/td\u003e\n\u003ctd style=\"border-bottom:1px solid #eee;padding:8px;vertical-align:top;\"\u003e150 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border-bottom:1px solid #eee;padding:8px;vertical-align:top;\"\u003eMaximum working load (lb)\u003c\/td\u003e\n\u003ctd style=\"border-bottom:1px solid #eee;padding:8px;vertical-align:top;\"\u003e330 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border-bottom:1px solid #eee;padding:8px;vertical-align:top;\"\u003eSheave Ø (in)\u003c\/td\u003e\n\u003ctd style=\"border-bottom:1px solid #eee;padding:8px;vertical-align:top;\"\u003e2 1\/4 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border-bottom:1px solid #eee;padding:8px;vertical-align:top;\"\u003eSheave Ø (mm)\u003c\/td\u003e\n\u003ctd style=\"border-bottom:1px solid #eee;padding:8px;vertical-align:top;\"\u003e57 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border-bottom:1px solid #eee;padding:8px;vertical-align:top;\"\u003eWeight (g)\u003c\/td\u003e\n\u003ctd style=\"border-bottom:1px solid #eee;padding:8px;vertical-align:top;\"\u003e44.8 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border-bottom:1px solid #eee;padding:8px;vertical-align:top;\"\u003eWeight (oz)\u003c\/td\u003e\n\u003ctd style=\"border-bottom:1px solid #eee;padding:8px;vertical-align:top;\"\u003e1.58 oz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c!-- sr-faq v=1 vendor=harken source_sha256=58cd9ef17ba36963972df25c543aca3d6509415e24f148cdc8701de1408f8f93 --\u003e\u003ch3\u003eFAQs\u003c\/h3\u003e\u003cdetails\u003e\u003csummary\u003eWhere can you find additional safety, maintenance, and warranty info?\u003c\/summary\u003e\u003cdiv\u003e\u003cp\u003eFor more information, refer to the Harken catalog or their manuals section.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhat should be inspected for wear during maintenance?\u003c\/summary\u003e\u003cdiv\u003e\u003cp\u003eInspect and replace worn, UV damaged, or compromised splices on lashings and attachment loops.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eHow do you distribute cleaning solution during maintenance?\u003c\/summary\u003e\u003cdiv\u003e\u003cp\u003eRotate the sheave to distribute detergent and water through the ceramic bearings and sideplates.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eHow should the block be cleaned during maintenance?\u003c\/summary\u003e\u003cdiv\u003e\u003cp\u003eClean frequently with detergent and fresh water applied to the sheave, bearings, and sideplate areas while rotating parts.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eAre there any special mounting instructions for blocks with a becket?\u003c\/summary\u003e\u003cdiv\u003e\u003cp\u003eIf adding a block to the becket, keep the load on the lower block no more than 1\/3 the load of the upper block.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhat is an important caution when mounting the block?\u003c\/summary\u003e\u003cdiv\u003e\u003cp\u003eDo not lash in line with the seam, as this may split the block apart and cause it to fail.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eHow should the Zircon block be attached for mounting?\u003c\/summary\u003e\u003cdiv\u003e\u003cp\u003eAttach the block using lashing or loops secured to the head. Make sure to lash through both cheeks, not in line with the seam.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eAre there load limitations when using additional blocks on the becket?\u003c\/summary\u003e\u003cdiv\u003e\u003cp\u003eYes, the block on the becket used to increase mechanical advantage must bear no more than 1\/3 the load of the upper block.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhat materials are used in the sheave and sideplates?\u003c\/summary\u003e\u003cdiv\u003e\u003cp\u003eThe sheave and sideplates are made from strong, reliable fiber reinforced composite construction.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhat kind of bearing is used in the Zircon block?\u003c\/summary\u003e\u003cdiv\u003e\u003cp\u003eComposite sheaves are insert-molded with low friction ceramic bearings for high performance.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhat happens if lashings are in line with the seam?\u003c\/summary\u003e\u003cdiv\u003e\u003cp\u003eIf the lashing or attachment is in line with the seam, it may split the block apart and cause failure. Always lash through both cheeks.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Where can you find additional safety, maintenance, and warranty info?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"For more information, refer to the Harken catalog or their manuals section.\"}}, {\"@type\": \"Question\", \"name\": \"What should be inspected for wear during maintenance?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Inspect and replace worn, UV damaged, or compromised splices on lashings and attachment loops.\"}}, {\"@type\": \"Question\", \"name\": \"How do you distribute cleaning solution during maintenance?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Rotate the sheave to distribute detergent and water through the ceramic bearings and sideplates.\"}}, {\"@type\": \"Question\", \"name\": \"How should the block be cleaned during maintenance?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Clean frequently with detergent and fresh water applied to the sheave, bearings, and sideplate areas while rotating parts.\"}}, {\"@type\": \"Question\", \"name\": \"Are there any special mounting instructions for blocks with a becket?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"If adding a block to the becket, keep the load on the lower block no more than 1\/3 the load of the upper block.\"}}, {\"@type\": \"Question\", \"name\": \"What is an important caution when mounting the block?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Do not lash in line with the seam, as this may split the block apart and cause it to fail.\"}}, {\"@type\": \"Question\", \"name\": \"How should the Zircon block be attached for mounting?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Attach the block using lashing or loops secured to the head. Make sure to lash through both cheeks, not in line with the seam.\"}}, {\"@type\": \"Question\", \"name\": \"Are there load limitations when using additional blocks on the becket?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes, the block on the becket used to increase mechanical advantage must bear no more than 1\/3 the load of the upper block.\"}}, {\"@type\": \"Question\", \"name\": \"What materials are used in the sheave and sideplates?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The sheave and sideplates are made from strong, reliable fiber reinforced composite construction.\"}}, {\"@type\": \"Question\", \"name\": \"What kind of bearing is used in the Zircon block?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Composite sheaves are insert-molded with low friction ceramic bearings for high performance.\"}}, {\"@type\": \"Question\", \"name\": \"What happens if lashings are in line with the seam?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"If the lashing or attachment is in line with the seam, it may split the block apart and cause failure. Always lash through both cheeks.\"}}]}\u003c\/script\u003e\u003c!-- \/sr-faq --\u003e\u003c!-- \/harken-official --\u003e","brand":"Harken","offers":[{"title":"Single","offer_id":53250990801233,"sku":"2195","price":60.0,"currency_code":"GBP","in_stock":true},{"title":"Double","offer_id":53250990834001,"sku":"2197","price":118.0,"currency_code":"GBP","in_stock":true},{"title":"Triple","offer_id":53250990899537,"sku":"2199","price":175.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0955\/4434\/4913\/files\/940fe560-482e-47d0-88f2-475bb6c6afdb_e45f67c3-a7cf-43fe-8038-17cb9a789af7.jpg?v=1773130229","url":"https:\/\/www.sailrace.com\/en-gb\/products\/harken-57-mm-zircon-block","provider":"SailRACE","version":"1.0","type":"link"}