{"id":8048,"date":"2026-06-08T08:21:43","date_gmt":"2026-06-08T06:21:43","guid":{"rendered":"https:\/\/snap-on.eu\/snap-on-qb4r750-cle-dynamometrique-a-cassure-3-4\/"},"modified":"2026-08-19T13:20:48","modified_gmt":"2026-08-19T11:20:48","slug":"snap-on-qb4r750-cle-dynamometrique-a-cassure-3-4","status":"publish","type":"post","link":"https:\/\/snap-on.eu\/fr\/snap-on-qb4r750-cle-dynamometrique-a-cassure-3-4\/","title":{"rendered":"Snap-on QB4R750 : cl\u00e9 dynamom\u00e9trique \u00e0 cassure 3\/4″"},"content":{"rendered":"
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Le serrage des \u00e9crous et des vis de roue doit imp\u00e9rativement respecter les sp\u00e9cifications du constructeur du v\u00e9hicule. Un couple de serrage insuffisant est extr\u00eamement dangereux : un \u00e9crou qui se desserre sur un v\u00e9hicule en mouvement peut avoir des cons\u00e9quences fatales. \u00c0 l\u2019inverse, un serrage excessif risque d\u2019endommager les goujons ou les filetages et d\u2019entra\u00eener des r\u00e9parations co\u00fbteuses. <\/span><\/p>\n

La cl\u00e9 dynamom\u00e9trique \u00e0 cassure Snap-on QB4R750 apporte une r\u00e9ponse id\u00e9ale. Vous r\u00e9glez le couple souhait\u00e9, puis vous serrez. D\u00e8s que la valeur d\u00e9finie est atteinte, la t\u00eate de la cl\u00e9 bascule physiquement <\/a>gr\u00e2ce \u00e0 son m\u00e9canisme de cassure. Il devient alors impossible de continuer \u00e0 serrer. <\/span><\/p>\n\n <\/div>\n \n \n <\/section>\n

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Caract\u00e9ristiques uniques de la Snap-on QB4R750<\/h3>\n
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\n \"Red-dot-1\"\n\n Angle de cassure de 18\u00b0 : emp\u00eache physiquement tout serrage excessif.<\/span>\n <\/p>\n

\n \"Red-dot-1\"\n\n \u00c9chelle gradu\u00e9e tr\u00e8s lisible : permet un r\u00e9glage rapide, pr\u00e9cis et sans erreur.<\/span>\n <\/p>\n

\n \"Red-dot-1\"\n\n Rev\u00eatement par poudre robuste : con\u00e7u pour r\u00e9sister \u00e0 des ann\u00e9es d\u2019utilisation intensive en atelier.<\/span>\n <\/p>\n

\n \"Red-dot-1\"\n\n T\u00eate \u00e0 cliquet \u00e9tanche \u00e0 32 dents : pratiquement sans entretien.<\/span>\n <\/p>\n

\n \"Red-dot-1\"\n\n Poign\u00e9e de grande dimension : guide naturellement la main vers la position de prise optimale.<\/span>\n <\/p>\n

\n \"Red-dot-1\"\n\n Syst\u00e8me de d\u00e9montage rapide : permet de s\u00e9parer la cl\u00e9 en deux parties pour faciliter le transport et le rangement.<\/span>\n <\/p>\n <\/div>\n

<\/p>\n \n \n <\/section>\n\n

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Comment fonctionne une cl\u00e9 dynamom\u00e9trique \u00e0 cassure ?<\/b><\/h3>\n

Une cl\u00e9 dynamom\u00e9trique \u00e0 cassure fonctionne diff\u00e9remment d\u2019une cl\u00e9 \u00e0 d\u00e9clic conventionnelle. Sur un mod\u00e8le \u00e0 d\u00e9clic, un signal sonore se fait entendre lorsque le couple est atteint. Ce syst\u00e8me est efficace dans un environnement calme, mais le signal peut facilement passer inaper\u00e7u dans un atelier bruyant.<\/p>\n

Sur une cl\u00e9 \u00e0 cassure, la t\u00eate bascule nettement d\u00e8s que la valeur cible est atteinte. Ce mouvement se voit et se ressent imm\u00e9diatement dans la main. C\u2019est ce qui rend la QB4R750 particuli\u00e8rement fiable dans les environnements de travail bruyants. <\/span><\/p>\n



<\/p>\n\n <\/div>\n \n \n <\/section>\n

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Pour quelles applications utiliser cette cl\u00e9 ?<\/b><\/h3>\n

Gr\u00e2ce \u00e0 sa plage de r\u00e9glage de 300 \u00e0 1 000 Nm, la QB4R750 est con\u00e7ue pour les travaux les plus lourds. <\/span>Poids lourds et bus : id\u00e9ale pour le serrage des \u00e9crous de roue. Selon la marque et le mod\u00e8le, les camions requi\u00e8rent g\u00e9n\u00e9ralement un couple compris entre 300 et 650 Nm. Les valeurs sont similaires pour les bus. <\/span><\/p>\n

Secteur agricole : parfaite pour les \u00e9crous de roue des tracteurs et des moissonneuses-batteuses. Les grands tracteurs \u00e9quip\u00e9s de jantes lourdes exigent parfois un couple sup\u00e9rieur \u00e0 600 Nm. <\/span><\/p>\n

Maintenance industrielle et tuyauterie : utilis\u00e9e dans les usines et les installations industrielles pour le serrage des boulons d\u2019assemblage de brides m\u00e9talliques sur les pompes, les compresseurs et les conduites.<\/p>\n

\u00c9olien : les grands boulons d\u2019assemblage des structures d\u2019\u00e9oliennes exigent un serrage au couple d\u2019une grande pr\u00e9cision.<\/p>\n

Important : ne jamais utiliser cette cl\u00e9 pour desserrer des boulons ou des vis gripp\u00e9s. Une cl\u00e9 dynamom\u00e9trique est un outil de pr\u00e9cision exclusivement destin\u00e9 au serrage \u00e0 un couple d\u00e9fini. <\/span><\/p>\n\n <\/div>\n \n \n <\/section>\n\n

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Entretien et \u00e9talonnage<\/b><\/h3>\n

Une cl\u00e9 dynamom\u00e9trique \u00e0 cassure n\u00e9cessite un \u00e9talonnage r\u00e9gulier afin de pr\u00e9server sa pr\u00e9cision.<\/p>\n

Apr\u00e8s chaque utilisation : ramenez toujours la cl\u00e9 \u00e0 sa valeur de r\u00e9glage la plus basse. Cela permet de rel\u00e2cher la tension du ressort interne et de maintenir la pr\u00e9cision de l\u2019outil dans le temps.<\/p>\n

Entretien du cliquet : des kits de maintenance d\u2019origine Snap-on sont disponibles pour entretenir la t\u00eate \u00e0 cliquet. <\/span><\/p>\n

La QB4R750 est le mod\u00e8le le plus puissant de la gamme. Pour des applications n\u00e9cessitant un couple inf\u00e9rieur, deux autres mod\u00e8les sont disponibles.<\/p>\n

QB4R450 : jusqu\u2019\u00e0 600 Nm.
QB4R600 : jusqu\u2019\u00e0 800 Nm. <\/span><\/p>\n

Sp\u00e9cifications techniques<\/b><\/p>\n

R\u00e9f\u00e9rence : QB4R750 <\/span>
\n<\/span>Carr\u00e9 d\u2019entra\u00eenement : 3\/4″ <\/span>
\n<\/span>Plage de couple : 300 \u00e0 1.000 Nm (200 \u00e0 750 ft-lb) <\/span>
\n<\/span>T\u00eate \u00e0 cliquet : 32 dents, \u00e9tanche, t\u00eate fixe <\/span>
\n<\/span>Angle de reprise : 11\u00b0 <\/span>
\n<\/span>Angle de cassure : 18\u00b0 Largeur de la t\u00eate : 63,5 mm <\/span>
\n<\/span>Longueur maximale : environ 155 cm (61 13\/16″) <\/span>
\n<\/span>Poids : 7,35 kg <\/span>
\n<\/span>Origine : Royaume-Uni<\/span><\/p>\n\n <\/div>\n \n \n <\/section>\n

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Vous voulez en savoir plus sur cet article ?<\/p>\n \n Prenez contact avec nous \"\"\n<\/a>\n <\/div>\n \n \n <\/section>\n","protected":false},"excerpt":{"rendered":"

Le serrage des \u00e9crous et des vis de roue doit imp\u00e9rativement respecter les sp\u00e9cifications du constructeur du v\u00e9hicule. 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