{"product_id":"ronstan-series-75-core-block-single-durable-aluminum-alloy-cheek-and-acetal-sheave-for-sailing-applications","title":"Ronstan Series 75 Core Block - Single - Durable Aluminum Alloy Cheek and Acetal Sheave for Sailing Applications","description":"\u003cb\u003eSeries 75 Core Block - Single\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003eCore Blocks are a true all round solution. A tuned 2-stage bearing system provides excellent performance across the full working load range with an integrated thrust bearing feature and the resilience to handle high dynamic or static loads. Acetal sheave, alloy cheeks and stainless fixings complete the durable package. For reliability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eUniversal Bearing\u003c\/b\u003e\u003cbr\u003eDynamic and high static load performance\u003cbr\u003e\u003cbr\u003eThe Ronstan Universal Bearing incorporates our proven 2-stage bearing system\u003cbr\u003e\u003cbr\u003e\u003cb\u003eStage 1\u003c\/b\u003e - Under moderate loads, Acetal ball bearings ensure minimum friction.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eStage 2\u003c\/b\u003e - Under heavy loads, where deformation of ball bearings alone would result in increased friction, a sliding Acetal bearing on a polished stainless steel race takes over, maintaining low friction performance.\u003cbr\u003e\u003cbr\u003eAdditionally the ball bearings are configured to act as a thrust bearing between the sheave and cheeks, preventing the sheave from rubbing on the cheeks and causing friction when the line lead in and out of the block isn't perfect. Particularly important for cheek blocks.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eAlloy Cheek Plates\u003c\/b\u003e\u003cbr\u003eBlock cheeks are manufactured from the highest quality alloy for maximum strength. Material optimisation and the cut-away design minimises weight and allows easy fresh water rinsing of salt and debris from the bearings.  Cheek design has been further styled with flaring at the block throat and reduced gap between the cheek and sheave, minimising rope wear.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eUniversal head\u003c\/b\u003e\u003cbr\u003eThe head assembly incorporates a brass bearing washer to provide smooth 360 rotation of the post and shackle. A set screw arrangement allows the head to be locked at 0 or 90.\u003cbr\u003e\u003cbr\u003eShackles are high quality forged grade 316 stainless steel.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eClass leading performance and sleek, contemporary styling\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eExcellent dynamic and high static load performance\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eLess than half the friction of the nearest competitor\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eUniversal head with full 3-axis articulation\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eHead posts can be locked at 0 or 90 degrees, by using a 2.5mm Hex\/Allen Key\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCentral hub hole can be used as a becket take-off or tie-up point\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eApplications:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eIdeal for mainsheet, halyard and spinnaker sheet applications on boats to 14M (46')\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eVarious control line applications on larger yachts\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eMaterials:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eSheave: U.V. stabilized Acetal\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCheek body: Aluminium Alloy\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eBall Bearings: High compression strength carbon black Acetal\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eShackle, head post :\t75mm(3\")\u003cbr\u003e\u003cb\u003eMax. Rope :\u003c\/b\u003e\t14mm(9\/16\")\u003cbr\u003e\u003cb\u003ePin :\u003c\/b\u003e\t8mm(5\/16\")\u003cbr\u003e\u003cb\u003eM.W.L.:\u003c\/b\u003e\t1,500kg(3,300lbs)\u003cbr\u003e\u003cb\u003eB. L.:\u003c\/b\u003e\t3,000kg(6,600lbs)\u003cbr\u003e\u003cb\u003eWeight:\u003c\/b\u003e\t354g(12.5oz)\u003cbr\u003e\u003cbr\u003e \u003c!--- cis2:m2lumZRk ---\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe Ronstan Series 75 Core Block - Single is a versatile and high-performance sailing hardware designed for both cruising and racing yachts up to 46 feet. Featuring a robust 2-stage bearing system, this block offers exceptional performance across a wide range of loads, ensuring smooth operation and long-lasting reliability. The integrated thrust bearing and high-quality materials make it ideal for sheets, halyards, and control lines, providing sailors with confidence in demanding conditions. Constructed with a durable alloy cheek plate and a UV-stabilized Acetal sheave, the core block is engineered to withstand harsh marine environments while maintaining minimal weight and ease of maintenance.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\u003cli\u003eUniversal Bearing System: Combines Acetal ball bearings and sliding Acetal on stainless steel race for optimal low-friction performance under varying load conditions.\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eAlloy Cheek Plates: Manufactured from high-strength aluminum alloy, designed for maximum durability, weight reduction, and easy rinsing of salt and debris.\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eUniversal Head with 3-Axis Articulation: Allows for flexible movement and smooth rotation, with lockable positions at 0 and 90 degrees using a hex\/Allen key.\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eHigh-Quality Components: Includes forged grade 316 stainless steel shackles and a brass bearing washer for reliable operation and corrosion resistance.\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eMaximum Rope Size: Suitable for ropes up to 9\/16 inch (14mm) diameter, with a maximum working load of 3,300 lbs and breaking load of 6,600 lbs.\u003c\/li\u003e\u003c\/ul\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":44529289232426,"sku":"55264","price":153.85,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0692\/2285\/8794\/files\/55264XL.jpg?v=1783069892","url":"https:\/\/atticusgoods.com\/products\/ronstan-series-75-core-block-single-durable-aluminum-alloy-cheek-and-acetal-sheave-for-sailing-applications","provider":"Atticus Goods","version":"1.0","type":"link"}