{"id":2045,"date":"2021-01-20T15:31:09","date_gmt":"2021-01-20T14:31:09","guid":{"rendered":"https:\/\/www.redhillballs.com\/?page_id=2045"},"modified":"2025-09-29T23:08:31","modified_gmt":"2025-09-29T21:08:31","slug":"galets-a-aiguilles-nra-a-extremites-spheriques","status":"publish","type":"page","link":"https:\/\/www.redhillballs.com\/fr\/produits\/rouleaux-et-aiguilles\/galets-a-aiguilles-nra-a-extremites-spheriques\/","title":{"rendered":"Galets \u00e0 aiguilles NRA \u00e0 extr\u00e9mit\u00e9s sph\u00e9riques"},"content":{"rendered":"<h2>\ud83d\udee0\ufe0f <a href=\"https:\/\/en.wikipedia.org\/wiki\/Needle_roller_bearing?utm_source=chatgpt.com\">Galets \u00e0 aiguilles NRA \u00e0 extr\u00e9mit\u00e9s sph\u00e9riques \u2013 Galets \u00e0 bouts arrondis pour ensembles compacts \u00e0 forte charge<\/a><\/h2>\n<p>Les galets \u00e0 aiguilles NRA \u00e0 extr\u00e9mit\u00e9s sph\u00e9riques sont des \u00e9l\u00e9ments \u00e0 bouts arrondis utilis\u00e9s dans des cages de pr\u00e9cision et des ensembles de roulements \u00e0 aiguilles lorsque de fortes charges radiales, un faible frottement et un encombrement r\u00e9duit sont essentiels. Les pointes sph\u00e9riques (arrondies) r\u00e9duisent les contraintes de bord et favorisent la distribution du lubrifiant, assurant une rotation r\u00e9guli\u00e8re et une longue dur\u00e9e de vie dans les bo\u00eetes de vitesses, transmissions, mouvements lin\u00e9aires et autres syst\u00e8mes de commande de mouvement.<\/p>\n<h3>\ud83d\udd27 Caract\u00e9ristiques techniques cl\u00e9s<\/h3>\n<ul>\n<li><strong>G\u00e9om\u00e9trie des extr\u00e9mit\u00e9s<\/strong> : NRA = extr\u00e9mit\u00e9s sph\u00e9riques\/arrondies pour une meilleure r\u00e9partition de charge et un \u00e9coulement de lubrifiant am\u00e9lior\u00e9 par rapport aux extr\u00e9mit\u00e9s planes.<\/li>\n<li><strong>Normes<\/strong> : Fabrication selon DIN 5402-3 \/ ISO 3096 (classes dimensionnelles et de pr\u00e9cision).<\/li>\n<li><strong>Mat\u00e9riaux<\/strong> : Acier \u00e0 roulement au chrome 100Cr6 (AISI 52100) ; options inox (AISI 420C\/440C) et c\u00e9ramiques\/carbures techniques sur demande.<\/li>\n<li><strong>Duret\u00e9 (AISI 52100)<\/strong> : ~60\u201366 HRC apr\u00e8s traitement thermique.<\/li>\n<li><strong>Dimensions typiques<\/strong> : Diam\u00e8tre Dw \u2248 1,0\u20136,0 mm ; longueur Lw \u2248 5,8\u201359,8 mm (autres tailles selon plan).<\/li>\n<li><strong>Tol\u00e9rances typiques<\/strong> : Diam\u00e8tre 0\/\u221210 \u00b5m ; classes de pr\u00e9cision G2, G3, G5 (selon ISO 3096\/DIN 5402-3).<\/li>\n<\/ul>\n<h3>\u2705 Avantages<\/h3>\n<ul>\n<li><strong>Forte capacit\u00e9 radiale<\/strong> avec section minimale pour conceptions compactes.<\/li>\n<li><strong>Contraintes de bord r\u00e9duites &amp; lubrification plus r\u00e9guli\u00e8re<\/strong> gr\u00e2ce aux extr\u00e9mit\u00e9s sph\u00e9riques (fiabilit\u00e9 accrue en cas de d\u00e9salignement).<\/li>\n<li><strong>Qualit\u00e9 de surface<\/strong> et tris serr\u00e9s des tol\u00e9rances pour faible frottement et faux-rond constant.<\/li>\n<li><strong>Polyvalence des mat\u00e9riaux<\/strong> selon exigences d\u2019usure, de corrosion ou de temp\u00e9rature.<\/li>\n<\/ul>\n<h3>\ud83d\udd04 Applications typiques des galets \u00e0 aiguilles NRA \u00e0 extr\u00e9mit\u00e9s sph\u00e9riques<\/h3>\n<ul>\n<li><strong>Cages \u00e0 aiguilles &amp; ensembles de roulements<\/strong> dans r\u00e9ducteurs, engrenages plan\u00e9taires &amp; harmoniques.<\/li>\n<li><strong>Transmissions automobiles<\/strong> et sous-ensembles compacts de groupes motopropulseurs.<\/li>\n<li><strong>Guidages lin\u00e9aires<\/strong>, machines-outils, micromoteurs et syst\u00e8mes de mouvement.<\/li>\n<\/ul>\n<h3>\ud83d\udce6 Grades &amp; dimensions disponibles<\/h3>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li><strong>Grades<\/strong> : G2\u2013G5 (selon DIN 5402-3 \/ ISO 3096) ; s\u00e9lections sp\u00e9ciales sur demande.<\/li>\n<li><a href=\"https:\/\/www.redhillballs.com\/company\/ball-diameters\/\"><strong>Plage de diam\u00e8tres<\/strong><\/a> : ~1,0\u20136,0 mm (type NRA) ; <strong>Longueurs<\/strong> : ~5,8\u201359,8 mm.<\/li>\n<li><strong>Types<\/strong> : NRA (extr\u00e9mit\u00e9s sph\u00e9riques)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-252\" src=\"https:\/\/www.redhillballs.com\/wp-content\/uploads\/2021\/01\/needle-roller-nra-spherical-ends.jpg\" alt=\"\" width=\"400\" height=\"196\" srcset=\"https:\/\/www.redhillballs.com\/wp-content\/uploads\/2021\/01\/needle-roller-nra-spherical-ends.jpg 400w, https:\/\/www.redhillballs.com\/wp-content\/uploads\/2021\/01\/needle-roller-nra-spherical-ends-300x147.jpg 300w\" sizes=\"auto, (max-width: 400px) 100vw, 400px\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\ud83d\udee0\ufe0f Galets \u00e0 aiguilles NRA \u00e0 extr\u00e9mit\u00e9s sph\u00e9riques \u2013 Galets \u00e0 bouts arrondis pour ensembles compacts \u00e0 forte charge Les galets \u00e0 aiguilles NRA \u00e0 extr\u00e9mit\u00e9s sph\u00e9riques sont des \u00e9l\u00e9ments \u00e0 bouts arrondis utilis\u00e9s dans des cages de pr\u00e9cision et des ensembles de roulements \u00e0 aiguilles lorsque de fortes charges radiales, un faible frottement et [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":6971,"parent":2043,"menu_order":1,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-2045","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.8 (Yoast SEO v28.8) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Galets \u00e0 aiguilles NRA \u00e0 extr\u00e9mit\u00e9s sph\u00e9riques<\/title>\n<meta name=\"description\" content=\"Galets \u00e0 aiguilles NRA \u00e0 extr\u00e9mit\u00e9s sph\u00e9riques : pr\u00e9cis, r\u00e9sistants et durables, id\u00e9aux pour roulements compacts et charges \u00e9lev\u00e9es.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.redhillballs.com\/fr\/produits\/rouleaux-et-aiguilles\/galets-a-aiguilles-nra-a-extremites-spheriques\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Galets \u00e0 aiguilles NRA \u00e0 extr\u00e9mit\u00e9s sph\u00e9riques\" \/>\n<meta property=\"og:description\" content=\"Galets \u00e0 aiguilles NRA \u00e0 extr\u00e9mit\u00e9s sph\u00e9riques : pr\u00e9cis, r\u00e9sistants et durables, id\u00e9aux pour roulements compacts et charges \u00e9lev\u00e9es.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.redhillballs.com\/fr\/produits\/rouleaux-et-aiguilles\/galets-a-aiguilles-nra-a-extremites-spheriques\/\" \/>\n<meta property=\"og:site_name\" content=\"Redhill Precision Specialty Balls\" \/>\n<meta property=\"article:modified_time\" content=\"2025-09-29T21:08:31+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.redhillballs.com\/wp-content\/uploads\/2025\/09\/needle-roller-nra-spherical-ends-2.png\" \/>\n\t<meta property=\"og:image:width\" content=\"900\" \/>\n\t<meta property=\"og:image:height\" content=\"500\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data1\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.redhillballs.com\\\/fr\\\/produits\\\/rouleaux-et-aiguilles\\\/galets-a-aiguilles-nra-a-extremites-spheriques\\\/\",\"url\":\"https:\\\/\\\/www.redhillballs.com\\\/fr\\\/produits\\\/rouleaux-et-aiguilles\\\/galets-a-aiguilles-nra-a-extremites-spheriques\\\/\",\"name\":\"Galets \u00e0 aiguilles NRA \u00e0 extr\u00e9mit\u00e9s sph\u00e9riques\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.redhillballs.com\\\/fr\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.redhillballs.com\\\/fr\\\/produits\\\/rouleaux-et-aiguilles\\\/galets-a-aiguilles-nra-a-extremites-spheriques\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.redhillballs.com\\\/fr\\\/produits\\\/rouleaux-et-aiguilles\\\/galets-a-aiguilles-nra-a-extremites-spheriques\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.redhillballs.com\\\/wp-content\\\/uploads\\\/2025\\\/09\\\/needle-roller-nra-spherical-ends-2.png\",\"datePublished\":\"2021-01-20T14:31:09+00:00\",\"dateModified\":\"2025-09-29T21:08:31+00:00\",\"description\":\"Galets \u00e0 aiguilles NRA \u00e0 extr\u00e9mit\u00e9s sph\u00e9riques : pr\u00e9cis, r\u00e9sistants et durables, id\u00e9aux pour roulements compacts et charges \u00e9lev\u00e9es.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.redhillballs.com\\\/fr\\\/produits\\\/rouleaux-et-aiguilles\\\/galets-a-aiguilles-nra-a-extremites-spheriques\\\/#breadcrumb\"},\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.redhillballs.com\\\/fr\\\/produits\\\/rouleaux-et-aiguilles\\\/galets-a-aiguilles-nra-a-extremites-spheriques\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\\\/\\\/www.redhillballs.com\\\/fr\\\/produits\\\/rouleaux-et-aiguilles\\\/galets-a-aiguilles-nra-a-extremites-spheriques\\\/#primaryimage\",\"url\":\"https:\\\/\\\/www.redhillballs.com\\\/wp-content\\\/uploads\\\/2025\\\/09\\\/needle-roller-nra-spherical-ends-2.png\",\"contentUrl\":\"https:\\\/\\\/www.redhillballs.com\\\/wp-content\\\/uploads\\\/2025\\\/09\\\/needle-roller-nra-spherical-ends-2.png\",\"width\":900,\"height\":500,\"caption\":\"Galets \u00e0 aiguilles NRA \u00e0 extr\u00e9mit\u00e9s sph\u00e9riques\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.redhillballs.com\\\/fr\\\/produits\\\/rouleaux-et-aiguilles\\\/galets-a-aiguilles-nra-a-extremites-spheriques\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Dom\u016f\",\"item\":\"https:\\\/\\\/www.redhillballs.com\\\/fr\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Produits\",\"item\":\"https:\\\/\\\/www.redhillballs.com\\\/fr\\\/produits\\\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Rouleaux et Aiguilles\",\"item\":\"https:\\\/\\\/www.redhillballs.com\\\/fr\\\/produits\\\/rouleaux-et-aiguilles\\\/\"},{\"@type\":\"ListItem\",\"position\":4,\"name\":\"Galets \u00e0 aiguilles NRA \u00e0 extr\u00e9mit\u00e9s sph\u00e9riques\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.redhillballs.com\\\/fr\\\/#website\",\"url\":\"https:\\\/\\\/www.redhillballs.com\\\/fr\\\/\",\"name\":\"Redhill Precision Specialty Balls\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.redhillballs.com\\\/fr\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"fr-FR\"}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Galets \u00e0 aiguilles NRA \u00e0 extr\u00e9mit\u00e9s sph\u00e9riques","description":"Galets \u00e0 aiguilles NRA \u00e0 extr\u00e9mit\u00e9s sph\u00e9riques : pr\u00e9cis, r\u00e9sistants et durables, id\u00e9aux pour roulements compacts et charges \u00e9lev\u00e9es.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.redhillballs.com\/fr\/produits\/rouleaux-et-aiguilles\/galets-a-aiguilles-nra-a-extremites-spheriques\/","og_locale":"fr_FR","og_type":"article","og_title":"Galets \u00e0 aiguilles NRA \u00e0 extr\u00e9mit\u00e9s sph\u00e9riques","og_description":"Galets \u00e0 aiguilles NRA \u00e0 extr\u00e9mit\u00e9s sph\u00e9riques : pr\u00e9cis, r\u00e9sistants et durables, id\u00e9aux pour roulements compacts et charges \u00e9lev\u00e9es.","og_url":"https:\/\/www.redhillballs.com\/fr\/produits\/rouleaux-et-aiguilles\/galets-a-aiguilles-nra-a-extremites-spheriques\/","og_site_name":"Redhill Precision Specialty Balls","article_modified_time":"2025-09-29T21:08:31+00:00","og_image":[{"width":900,"height":500,"url":"https:\/\/www.redhillballs.com\/wp-content\/uploads\/2025\/09\/needle-roller-nra-spherical-ends-2.png","type":"image\/png"}],"twitter_card":"summary_large_image","twitter_misc":{"Dur\u00e9e de lecture estim\u00e9e":"3 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.redhillballs.com\/fr\/produits\/rouleaux-et-aiguilles\/galets-a-aiguilles-nra-a-extremites-spheriques\/","url":"https:\/\/www.redhillballs.com\/fr\/produits\/rouleaux-et-aiguilles\/galets-a-aiguilles-nra-a-extremites-spheriques\/","name":"Galets \u00e0 aiguilles NRA \u00e0 extr\u00e9mit\u00e9s sph\u00e9riques","isPartOf":{"@id":"https:\/\/www.redhillballs.com\/fr\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.redhillballs.com\/fr\/produits\/rouleaux-et-aiguilles\/galets-a-aiguilles-nra-a-extremites-spheriques\/#primaryimage"},"image":{"@id":"https:\/\/www.redhillballs.com\/fr\/produits\/rouleaux-et-aiguilles\/galets-a-aiguilles-nra-a-extremites-spheriques\/#primaryimage"},"thumbnailUrl":"https:\/\/www.redhillballs.com\/wp-content\/uploads\/2025\/09\/needle-roller-nra-spherical-ends-2.png","datePublished":"2021-01-20T14:31:09+00:00","dateModified":"2025-09-29T21:08:31+00:00","description":"Galets \u00e0 aiguilles NRA \u00e0 extr\u00e9mit\u00e9s sph\u00e9riques : pr\u00e9cis, r\u00e9sistants et durables, id\u00e9aux pour roulements compacts et charges \u00e9lev\u00e9es.","breadcrumb":{"@id":"https:\/\/www.redhillballs.com\/fr\/produits\/rouleaux-et-aiguilles\/galets-a-aiguilles-nra-a-extremites-spheriques\/#breadcrumb"},"inLanguage":"fr-FR","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.redhillballs.com\/fr\/produits\/rouleaux-et-aiguilles\/galets-a-aiguilles-nra-a-extremites-spheriques\/"]}]},{"@type":"ImageObject","inLanguage":"fr-FR","@id":"https:\/\/www.redhillballs.com\/fr\/produits\/rouleaux-et-aiguilles\/galets-a-aiguilles-nra-a-extremites-spheriques\/#primaryimage","url":"https:\/\/www.redhillballs.com\/wp-content\/uploads\/2025\/09\/needle-roller-nra-spherical-ends-2.png","contentUrl":"https:\/\/www.redhillballs.com\/wp-content\/uploads\/2025\/09\/needle-roller-nra-spherical-ends-2.png","width":900,"height":500,"caption":"Galets \u00e0 aiguilles NRA \u00e0 extr\u00e9mit\u00e9s sph\u00e9riques"},{"@type":"BreadcrumbList","@id":"https:\/\/www.redhillballs.com\/fr\/produits\/rouleaux-et-aiguilles\/galets-a-aiguilles-nra-a-extremites-spheriques\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Dom\u016f","item":"https:\/\/www.redhillballs.com\/fr\/"},{"@type":"ListItem","position":2,"name":"Produits","item":"https:\/\/www.redhillballs.com\/fr\/produits\/"},{"@type":"ListItem","position":3,"name":"Rouleaux et Aiguilles","item":"https:\/\/www.redhillballs.com\/fr\/produits\/rouleaux-et-aiguilles\/"},{"@type":"ListItem","position":4,"name":"Galets \u00e0 aiguilles NRA \u00e0 extr\u00e9mit\u00e9s sph\u00e9riques"}]},{"@type":"WebSite","@id":"https:\/\/www.redhillballs.com\/fr\/#website","url":"https:\/\/www.redhillballs.com\/fr\/","name":"Redhill Precision Specialty Balls","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.redhillballs.com\/fr\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"fr-FR"}]}},"_links":{"self":[{"href":"https:\/\/www.redhillballs.com\/fr\/wp-json\/wp\/v2\/pages\/2045","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.redhillballs.com\/fr\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.redhillballs.com\/fr\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.redhillballs.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.redhillballs.com\/fr\/wp-json\/wp\/v2\/comments?post=2045"}],"version-history":[{"count":3,"href":"https:\/\/www.redhillballs.com\/fr\/wp-json\/wp\/v2\/pages\/2045\/revisions"}],"predecessor-version":[{"id":7783,"href":"https:\/\/www.redhillballs.com\/fr\/wp-json\/wp\/v2\/pages\/2045\/revisions\/7783"}],"up":[{"embeddable":true,"href":"https:\/\/www.redhillballs.com\/fr\/wp-json\/wp\/v2\/pages\/2043"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.redhillballs.com\/fr\/wp-json\/wp\/v2\/media\/6971"}],"wp:attachment":[{"href":"https:\/\/www.redhillballs.com\/fr\/wp-json\/wp\/v2\/media?parent=2045"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}