{"product_id":"harken-40-mm-zircon-block","title":"Harken 40 mm Zircon Block","description":"\u003c!-- harken-official:v2 Sku:2190 page_sha256:7836fa17c838684fc278301d7a51594c06947a86c47550d44954fb8d634444d0 --\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;\"\u003e340 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;\"\u003e750 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;\"\u003e2 3\/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;\"\u003e60 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;\"\u003e5\/16 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;\"\u003e8 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;\"\u003e115 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;\"\u003e250 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;\"\u003e1 9\/16 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;\"\u003e40 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;\"\u003e22.9 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;\"\u003e0.81 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=ad85bea3e37e59eca325856720eaf3c7018ca5cc001e3a53181e827a2d710487 --\u003e\u003ch3\u003eFAQs\u003c\/h3\u003e\u003cdetails\u003e\u003csummary\u003eHow should the Zircon block be cleaned and maintained?\u003c\/summary\u003e\u003cdiv\u003e\u003cp\u003eClean frequently with detergent and fresh water, direct water into sheave, bearings, and sideplates. Flush while rotating parts.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhat is an important mounting safety warning for lashings?\u003c\/summary\u003e\u003cdiv\u003e\u003cp\u003eDo not lash in line with the seam, or the block may split apart and fail.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eAre there specific guidelines for using a becket with this block?\u003c\/summary\u003e\u003cdiv\u003e\u003cp\u003eIf adding a block to the becket, ensure the load is no more than 1\/3 of the upper block's load. Do not use a fully loaded separate system.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eCan this block be soft attached and what does that require?\u003c\/summary\u003e\u003cdiv\u003e\u003cp\u003eYes, it has a structural head for soft attachment using lashing through both cheeks.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eAre there precautions if you increase the mechanical advantage using a becket?\u003c\/summary\u003e\u003cdiv\u003e\u003cp\u003eYes, the load on the added block must not exceed 1\/3 of the upper block's load.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eDoes the block require frequent cleaning?\u003c\/summary\u003e\u003cdiv\u003e\u003cp\u003eYes, frequent cleaning is recommended for optimum performance, especially after exposure to salt water.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eAre there any inspection requirements for the attachment loops or lashings?\u003c\/summary\u003e\u003cdiv\u003e\u003cp\u003eInspect and replace worn, UV damaged, or compromised splices on lashings and attachment loops regularly.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhat is a critical warning when adding a block to the becket?\u003c\/summary\u003e\u003cdiv\u003e\u003cp\u003eEnsure the load on the block added for mechanical advantage is 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 the block construction material?\u003c\/summary\u003e\u003cdiv\u003e\u003cp\u003eThe sheave and sideplates are built from strong, reliable fiber reinforced composite construction.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhat should be inspected regularly on the block’s attachment?\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\u003eWhat is unique about the block’s bearing system?\u003c\/summary\u003e\u003cdiv\u003e\u003cp\u003eIt features composite sheaves insert-molded with low friction ceramic bearings inside caged races.\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\": \"How should the Zircon block be cleaned and maintained?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Clean frequently with detergent and fresh water, direct water into sheave, bearings, and sideplates. Flush while rotating parts.\"}}, {\"@type\": \"Question\", \"name\": \"What is an important mounting safety warning for lashings?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Do not lash in line with the seam, or the block may split apart and fail.\"}}, {\"@type\": \"Question\", \"name\": \"Are there specific guidelines for using a becket with this block?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"If adding a block to the becket, ensure the load is no more than 1\/3 of the upper block's load. Do not use a fully loaded separate system.\"}}, {\"@type\": \"Question\", \"name\": \"Can this block be soft attached and what does that require?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes, it has a structural head for soft attachment using lashing through both cheeks.\"}}, {\"@type\": \"Question\", \"name\": \"Are there precautions if you increase the mechanical advantage using a becket?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes, the load on the added block must not exceed 1\/3 of the upper block's load.\"}}, {\"@type\": \"Question\", \"name\": \"Does the block require frequent cleaning?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes, frequent cleaning is recommended for optimum performance, especially after exposure to salt water.\"}}, {\"@type\": \"Question\", \"name\": \"Are there any inspection requirements for the attachment loops or lashings?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Inspect and replace worn, UV damaged, or compromised splices on lashings and attachment loops regularly.\"}}, {\"@type\": \"Question\", \"name\": \"What is a critical warning when adding a block to the becket?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Ensure the load on the block added for mechanical advantage is no more than 1\/3 the load of the upper block.\"}}, {\"@type\": \"Question\", \"name\": \"What is the block construction material?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The sheave and sideplates are built from strong, reliable fiber reinforced composite construction.\"}}, {\"@type\": \"Question\", \"name\": \"What should be inspected regularly on the block’s attachment?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Inspect and replace worn, UV damaged, or compromised splices on lashings and attachment loops.\"}}, {\"@type\": \"Question\", \"name\": \"What is unique about the block’s bearing system?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"It features composite sheaves insert-molded with low friction ceramic bearings inside caged races.\"}}]}\u003c\/script\u003e\u003c!-- \/sr-faq --\u003e\u003c!-- \/harken-official --\u003e","brand":"Harken","offers":[{"title":"Single","offer_id":53250990211409,"sku":"2190","price":1123.0,"currency_code":"ZAR","in_stock":true},{"title":"Double","offer_id":53250990276945,"sku":"2192","price":1897.0,"currency_code":"ZAR","in_stock":true},{"title":"Triple","offer_id":53250990309713,"sku":"2194","price":2870.0,"currency_code":"ZAR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0955\/4434\/4913\/files\/940fe560-482e-47d0-88f2-475bb6c6afdb.jpg?v=1773130217","url":"https:\/\/www.sailrace.com\/en-za\/products\/harken-40-mm-zircon-block","provider":"SailRACE","version":"1.0","type":"link"}