{"title":"Performance Aluminium Sheave Boxes","description":"\u003cstyle\u003e\na {\n    text-decoration: none;\n    color: #464feb;\n}\ntr th, tr td {\n    border: 1px solid #e6e6e6;\n}\ntr th {\n    background-color: #f5f5f5;\n}\n\u003c\/style\u003e\n\u003cdiv\u003e\n\u003cp\u003eDesigned for high-performance sailing applications, this range of precision-machined aluminium sheave boxes, also known as exit blocks, offers smooth and reliable line management on boats up to 30ft.\u003c\/p\u003e\n\u003cp\u003eAvailable with either plain bearing or ball bearing sheaves, in a choice of acetal or stainless steel, these exit blocks are engineered for durability, efficiency, and low-friction performance.\u003c\/p\u003e\n\u003cp\u003eEach unit is supplied with a radiused plastic backing plate to provide a neat, gap-free fit on curved surfaces such as masts and spars. For installation on flat surfaces, the backing plate can be easily removed.\u003c\/p\u003e\n\u003cp\u003eSuitable for halyards, control lines, and general running rigging, these versatile sheave boxes can be used with both rope and wire systems, making them an ideal choice for a wide range of sailing applications.\u003c\/p\u003e\n\u003c\/div\u003e","products":[{"product_id":"20mm-exit-sheave-box","title":"20mm Exit Sheave Box","description":"\u003cdiv\u003e\n\u003ch3\u003e20mm Exit Sheave Box\u003c\/h3\u003e\n\u003cp\u003eDesigned to improve the efficiency and durability of rigging systems, this 20mm Exit Sheave Box provides smooth and reliable rope or wire routing for masts, decks, and other marine applications. Manufactured from CNC-machined marine-grade aluminium, it features a removable axle pin for simple maintenance or sheave replacement, with a curved backing plate included for mounting to the leading edge of a mast.\u003c\/p\u003e\n\u003cp\u003eAvailable with a choice of sheave options, the design helps minimise wear on halyards, extending rope life while ensuring efficient performance.\u003c\/p\u003e\n\u003ch4\u003eKey Features:\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eCNC-machined marine-grade aluminium body\u003c\/li\u003e\n\u003cli\u003eRemovable axle pin for easy maintenance\u003c\/li\u003e\n\u003cli\u003eIncludes curved backing plate for mast mounting\u003c\/li\u003e\n\u003cli\u003eSuitable for rope and wire applications\u003c\/li\u003e\n\u003cli\u003eOptimised design to reduce halyard wear\u003c\/li\u003e\n\u003cli\u003eCorrosion-resistant construction\u003c\/li\u003e\n\u003cli\u003eIdeal for masts, decks, and other marine installations\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eSheave Options:\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eAcetal Plain Bearing: Lightweight, low-maintenance option suitable for working loads up to 200kg. Compatible with rope and wire.\u003c\/li\u003e\n\u003cli\u003eDynamic Bearing: Features patented Dynamic Bearing Technology for exceptionally low friction and smooth operation. Ideal for fast-running systems with working loads up to 105kg. Best suited to rope applications.\u003c\/li\u003e\n\u003cli\u003eStainless Steel Plain Bearing: Heavy-duty option designed for highly statically loaded applications, with working loads up to 250kg. Compatible with rope and wire.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Allen","offers":[{"title":"Plain \/ Acetal","offer_id":57196893733239,"sku":"A4420-4215-AP","price":36.08,"currency_code":"GBP","in_stock":true},{"title":"Dynamic \/ Acetal","offer_id":57196893766007,"sku":"A4420-4215-D","price":38.61,"currency_code":"GBP","in_stock":true},{"title":"Plain \/ Steel","offer_id":57196893798775,"sku":"A4420-4215-SP","price":40.3,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0983\/7087\/9863\/files\/A4420-4215G-TOP.jpg?v=1781801773"},{"product_id":"30mm-exit-sheave-box","title":"30mm Exit Sheave Box","description":"\u003cdiv\u003e\n\u003ch3\u003e30mm Exit Sheave Box\u003c\/h3\u003e\n\u003cp\u003eDesigned to improve the efficiency and durability of rigging systems, this 30mm Exit Sheave Box provides smooth and reliable rope or wire routing for masts, decks, and other marine applications. Manufactured from CNC-machined marine-grade aluminium, it features a removable axle pin for simple maintenance or sheave replacement, with a curved backing plate included for mounting to the leading edge of a mast.\u003c\/p\u003e\n\u003cp\u003eAvailable with a choice of sheave options, the design helps minimise wear on halyards, extending rope life while ensuring efficient performance.\u003c\/p\u003e\n\u003ch4\u003eKey Features:\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eCNC-machined marine-grade aluminium body\u003c\/li\u003e\n\u003cli\u003eRemovable axle pin for easy maintenance\u003c\/li\u003e\n\u003cli\u003eIncludes curved backing plate for mast mounting\u003c\/li\u003e\n\u003cli\u003eSuitable for rope and wire applications\u003c\/li\u003e\n\u003cli\u003eOptimised design to reduce halyard wear\u003c\/li\u003e\n\u003cli\u003eCorrosion-resistant construction\u003c\/li\u003e\n\u003cli\u003eIdeal for masts, decks, and other marine installations\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eSheave Options:\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eAcetal Plain Bearing: Lightweight, low-maintenance option suitable for working loads up to 200kg. Compatible with rope and wire.\u003c\/li\u003e\n\u003cli\u003eDynamic Ball Bearing: Features patented Dynamic Bearing Technology for exceptionally low friction and smooth operation. Ideal for fast-running systems with working loads up to 140kg. Best suited to rope applications.\u003c\/li\u003e\n\u003cli\u003eStainless Steel Plain Bearing: Heavy-duty option designed for highly statically loaded applications, with working loads up to 300kg. Compatible with rope and wire.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Allen","offers":[{"title":"Plain \/ Acetal","offer_id":57196893962615,"sku":"A4430-4716-AP","price":40.59,"currency_code":"GBP","in_stock":true},{"title":"Dynamic \/ Acetal","offer_id":57196893995383,"sku":"A4430-4716-D","price":43.14,"currency_code":"GBP","in_stock":true},{"title":"Plain \/ Steel","offer_id":57196894028151,"sku":"A4430-4716-SP","price":46.93,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0983\/7087\/9863\/files\/A4438-5818S20B-2.jpg?v=1781801774"},{"product_id":"wire-exit-sheave-box","title":"Wire Exit Sheave Box","description":"\u003cdiv\u003e\n\u003ch3\u003eWire Exit Sheave Box\u003c\/h3\u003e\n\u003cp\u003eDesigned specifically for wire halyard applications, this Wire Exit Sheave Box features a large ferrule opening that allows a wire ferrule to pass smoothly over the sheave and into the mast. Ideal for jib halyards and similar systems, it helps reduce wear on halyards while ensuring smooth and reliable operation.\u003c\/p\u003e\n\u003cp\u003eManufactured from CNC-machined marine-grade aluminium, the sheave box includes a removable axle pin for easy maintenance or sheave replacement. A curved backing plate is also included, making it suitable for mounting to the leading edge of a mast.\u003c\/p\u003e\n\u003ch4\u003eKey Features:\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eCNC-machined marine-grade aluminium body\u003c\/li\u003e\n\u003cli\u003eLarge ferrule opening for wire halyard applications\u003c\/li\u003e\n\u003cli\u003eRemovable axle pin for easy maintenance\u003c\/li\u003e\n\u003cli\u003eIncludes curved backing plate for mast mounting\u003c\/li\u003e\n\u003cli\u003eSuitable for a wide range of mast sizes\u003c\/li\u003e\n\u003cli\u003eCorrosion-resistant construction\u003c\/li\u003e\n\u003cli\u003eDesigned for smooth and efficient wire routing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eSheave Options:\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eAcetal Plain Bearing: Lightweight, low-maintenance option with a maximum working load of up to 400kg.\u003c\/li\u003e\n\u003cli\u003eStainless Steel Ball Bearing: Low-friction option for maximum performance and fast-running systems, with a maximum working load of up to 500kg.\u003c\/li\u003e\n\u003cli\u003eStainless Steel Plain Bearing: Heavy-duty option for highly statically loaded applications, with a maximum working load of up to 600kg.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Allen","offers":[{"title":"Plain \/ Acetal","offer_id":57196894781815,"sku":"A4438-5415-AP","price":47.66,"currency_code":"GBP","in_stock":true},{"title":"Plain \/ Steel","offer_id":57196894814583,"sku":"A4438-5415-SP","price":45.12,"currency_code":"GBP","in_stock":true},{"title":"Dynamic \/ Steel","offer_id":57196894847351,"sku":"A4438-5415-SS","price":49.35,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0983\/7087\/9863\/files\/A4438-5415G-TOP.jpg?v=1781801784"},{"product_id":"38mm-exit-sheave-box","title":"38mm Exit Sheave Box","description":"\u003cdiv\u003e\n\u003ch3\u003e38mm Exit Sheave Box\u003c\/h3\u003e\n\u003cp\u003eDesigned to improve the efficiency and durability of rigging systems, this 38mm Exit Sheave Box provides smooth and reliable rope or wire routing for masts, decks, and other marine applications. Manufactured from CNC-machined marine-grade aluminium, it features a removable axle pin for simple maintenance or sheave replacement, with a curved backing plate included for mounting to the leading edge of a mast.\u003c\/p\u003e\n\u003cp\u003eAvailable with a choice of sheave options, the design helps minimise wear on halyards, extending rope life while ensuring efficient performance.\u003c\/p\u003e\n\u003ch4\u003eKey Features:\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eCNC-machined marine-grade aluminium body\u003c\/li\u003e\n\u003cli\u003eRemovable axle pin for easy maintenance\u003c\/li\u003e\n\u003cli\u003eIncludes curved backing plate for mast mounting\u003c\/li\u003e\n\u003cli\u003eSuitable for rope and wire applications\u003c\/li\u003e\n\u003cli\u003eOptimised design to reduce halyard wear\u003c\/li\u003e\n\u003cli\u003eCorrosion-resistant construction\u003c\/li\u003e\n\u003cli\u003eIdeal for masts, decks, and other marine installations\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eSheave Options:\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eAcetal Plain Bearing: Lightweight, low-maintenance option suitable for rope and wire applications.\u003c\/li\u003e\n\u003cli\u003eDynamic Bearing: Features patented Dynamic Bearing Technology for exceptionally low friction and smooth operation. Ideal for fast-running systems and rope applications.\u003c\/li\u003e\n\u003cli\u003eStainless Steel Plain Bearing: Heavy-duty option designed for highly statically loaded applications. Suitable for rope and wire use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Allen","offers":[{"title":"Plain \/ Acetal","offer_id":57196894880119,"sku":"A4438-5818-AP","price":47.66,"currency_code":"GBP","in_stock":true},{"title":"Plain \/ Steel","offer_id":57196894912887,"sku":"A4438-5818-SP","price":45.12,"currency_code":"GBP","in_stock":true},{"title":"Dynamic \/ Steel","offer_id":57196894945655,"sku":"A4438-5818-SS","price":49.35,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0983\/7087\/9863\/files\/A4438-5818S20B-3.jpg?v=1781801785"}],"url":"https:\/\/allenbrothers.co.uk\/collections\/performance-aluminium-sheave-boxes.oembed","provider":"Allen | Performance Sailing Hardware","version":"1.0","type":"link"}