{"id":5751,"date":"2025-12-24T05:09:10","date_gmt":"2025-12-24T05:09:10","guid":{"rendered":"https:\/\/korea-transmission.com\/?p=5751"},"modified":"2025-12-24T05:09:10","modified_gmt":"2025-12-24T05:09:10","slug":"gb-t-197-2018-thread-tolerance-standard","status":"publish","type":"post","link":"https:\/\/korea-transmission.com\/fr\/blog\/gb-t-197-2018-thread-tolerance-standard\/","title":{"rendered":"Norme de tol\u00e9rancement des filetages GB\/T 197-2018"},"content":{"rendered":"<div style=\"margin-bottom: 40px;\">\n<h2 style=\"color: #444; border-bottom: 1px solid #ddd; padding-bottom: 10px;\">Introduction \u00e0 la norme<\/h2>\n<p style=\"margin: 10px 0;\">La norme GB\/T 197-2018 sp\u00e9cifie les tol\u00e9rances des filetages m\u00e9triques d'usage g\u00e9n\u00e9ral, garantissant leur interchangeabilit\u00e9 et leurs performances dans les applications m\u00e9caniques. Cette norme d\u00e9finit les \u00e9carts fondamentaux, les tol\u00e9rances de diam\u00e8tre, les longueurs d'engagement et les zones de fonctionnement privil\u00e9gi\u00e9es pour les filetages int\u00e9rieurs et ext\u00e9rieurs, et s'applique \u00e0 des secteurs tels que l'automobile, l'a\u00e9rospatiale et la construction m\u00e9canique.<\/p>\n<p style=\"margin: 10px 0;\">Les tol\u00e9rances sont class\u00e9es par grades (de 3 \u00e0 9), les chiffres les plus bas indiquant une plus grande pr\u00e9cision. Les \u00e9carts fondamentaux (EI\/es) positionnent le domaine de tol\u00e9rance, tandis que les tol\u00e9rances (T) en d\u00e9finissent la largeur. La norme prend en charge trois groupes de longueur d'engagement\u00a0: courte (S), normale (N) et longue (L), d\u00e9finissant les types d'ajustement allant du jeu \u00e0 l'ajustement serr\u00e9.<\/p>\n<ul style=\"margin: 10px 0 10px 20px;\">\n<li>Les filetages internes utilisent les positions G et H.<\/li>\n<li>Les threads externes utilisent a, b, c, d, e, f, g, h.<\/li>\n<li>Les zones privil\u00e9gi\u00e9es comme le 6H\/6G garantissent un ajustement fiable.<\/li>\n<\/ul>\n<p style=\"margin: 10px 0;\">Ce guide fournit des informations pratiques pour le choix des tol\u00e9rances, l'optimisation des conceptions en termes de fabricabilit\u00e9 et de fonctionnalit\u00e9.<\/p>\n<\/div>\n<div style=\"margin-bottom: 40px;\">\n<h2 style=\"color: #444; border-bottom: 1px solid #ddd; padding-bottom: 10px;\">\u00c9carts fondamentaux pour les filetages internes et externes<\/h2>\n<p style=\"margin: 10px 0;\">Le tableau 1 r\u00e9pertorie les \u00e9carts fondamentaux (EI pour interne, es pour externe) en \u03bcm, par pas (P). Ceux-ci positionnent la zone de tol\u00e9rance par rapport au profil de base, ce qui est crucial pour le contr\u00f4le de l'ajustement.<\/p>\n<div class=\"table-wrapper\" style=\"overflow-x: auto; margin: 20px 0;\">\n<table style=\"width: 100%; border-collapse: collapse;\">\n<thead>\n<tr>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"4\">Pas P (mm)<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" colspan=\"10\">\u00c9cart fondamental (\u03bcm)<\/th>\n<\/tr>\n<tr>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" colspan=\"2\">Filetages internes<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" colspan=\"8\">Filetages externes<\/th>\n<\/tr>\n<tr>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"2\">G EI<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"2\">H EI<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"2\">un es<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"2\">\u00eatre<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"2\">c es<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"2\">des<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"2\">e es<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"2\">frais<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"2\">g es<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"2\">il<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">0.2<\/td>\n<td>17<\/td>\n<td>0<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>-17<\/td>\n<td>0<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">0.25<\/td>\n<td>18<\/td>\n<td>0<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>-18<\/td>\n<td>0<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">0.3<\/td>\n<td>18<\/td>\n<td>0<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>-18<\/td>\n<td>0<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">0.35<\/td>\n<td>19<\/td>\n<td>0<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>-34<\/td>\n<td>-19<\/td>\n<td>0<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">0.4<\/td>\n<td>19<\/td>\n<td>0<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>-34<\/td>\n<td>-19<\/td>\n<td>0<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">0.45<\/td>\n<td>20<\/td>\n<td>0<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>-35<\/td>\n<td>-20<\/td>\n<td>0<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">0.5<\/td>\n<td>20<\/td>\n<td>0<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>-50<\/td>\n<td>-36<\/td>\n<td>-20<\/td>\n<td>0<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">0.6<\/td>\n<td>21<\/td>\n<td>0<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>-53<\/td>\n<td>-36<\/td>\n<td>-21<\/td>\n<td>0<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">0.7<\/td>\n<td>22<\/td>\n<td>0<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>-56<\/td>\n<td>-38<\/td>\n<td>-22<\/td>\n<td>0<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">0.75<\/td>\n<td>22<\/td>\n<td>0<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>-56<\/td>\n<td>-38<\/td>\n<td>-22<\/td>\n<td>0<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">0.8<\/td>\n<td>24<\/td>\n<td>0<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>-60<\/td>\n<td>-38<\/td>\n<td>-24<\/td>\n<td>0<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">1<\/td>\n<td>26<\/td>\n<td>0<\/td>\n<td>-290<\/td>\n<td>-200<\/td>\n<td>-130<\/td>\n<td>-85<\/td>\n<td>-60<\/td>\n<td>-40<\/td>\n<td>-26<\/td>\n<td>0<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">1.25<\/td>\n<td>28<\/td>\n<td>0<\/td>\n<td>-295<\/td>\n<td>-205<\/td>\n<td>-135<\/td>\n<td>-90<\/td>\n<td>-63<\/td>\n<td>-42<\/td>\n<td>-28<\/td>\n<td>0<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">1.5<\/td>\n<td>32<\/td>\n<td>0<\/td>\n<td>-300<\/td>\n<td>-212<\/td>\n<td>-140<\/td>\n<td>-95<\/td>\n<td>-67<\/td>\n<td>-45<\/td>\n<td>-32<\/td>\n<td>0<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">1.75<\/td>\n<td>34<\/td>\n<td>0<\/td>\n<td>-310<\/td>\n<td>-220<\/td>\n<td>-145<\/td>\n<td>-100<\/td>\n<td>-71<\/td>\n<td>-48<\/td>\n<td>-34<\/td>\n<td>0<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">2<\/td>\n<td>38<\/td>\n<td>0<\/td>\n<td>-315<\/td>\n<td>-225<\/td>\n<td>-150<\/td>\n<td>-105<\/td>\n<td>-71<\/td>\n<td>-52<\/td>\n<td>-38<\/td>\n<td>0<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">2.5<\/td>\n<td>42<\/td>\n<td>0<\/td>\n<td>-325<\/td>\n<td>-235<\/td>\n<td>-160<\/td>\n<td>-110<\/td>\n<td>-80<\/td>\n<td>-58<\/td>\n<td>-42<\/td>\n<td>0<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">3<\/td>\n<td>48<\/td>\n<td>0<\/td>\n<td>-335<\/td>\n<td>-245<\/td>\n<td>-170<\/td>\n<td>-115<\/td>\n<td>-85<\/td>\n<td>-63<\/td>\n<td>-48<\/td>\n<td>0<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">3.5<\/td>\n<td>53<\/td>\n<td>0<\/td>\n<td>-345<\/td>\n<td>-255<\/td>\n<td>-180<\/td>\n<td>-125<\/td>\n<td>-90<\/td>\n<td>-70<\/td>\n<td>-53<\/td>\n<td>0<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">4<\/td>\n<td>60<\/td>\n<td>0<\/td>\n<td>-355<\/td>\n<td>-265<\/td>\n<td>-190<\/td>\n<td>-130<\/td>\n<td>-95<\/td>\n<td>-75<\/td>\n<td>-60<\/td>\n<td>0<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">4.5<\/td>\n<td>63<\/td>\n<td>0<\/td>\n<td>-365<\/td>\n<td>-280<\/td>\n<td>-200<\/td>\n<td>-135<\/td>\n<td>-100<\/td>\n<td>-80<\/td>\n<td>-63<\/td>\n<td>0<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">5<\/td>\n<td>71<\/td>\n<td>0<\/td>\n<td>-375<\/td>\n<td>-290<\/td>\n<td>-212<\/td>\n<td>-140<\/td>\n<td>-106<\/td>\n<td>-85<\/td>\n<td>-71<\/td>\n<td>0<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">5.5<\/td>\n<td>75<\/td>\n<td>0<\/td>\n<td>-385<\/td>\n<td>-300<\/td>\n<td>-224<\/td>\n<td>-150<\/td>\n<td>-112<\/td>\n<td>-90<\/td>\n<td>-75<\/td>\n<td>0<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">6<\/td>\n<td>80<\/td>\n<td>0<\/td>\n<td>-395<\/td>\n<td>-310<\/td>\n<td>-236<\/td>\n<td>-155<\/td>\n<td>-118<\/td>\n<td>-95<\/td>\n<td>-80<\/td>\n<td>0<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">8<\/td>\n<td>100<\/td>\n<td>0<\/td>\n<td>-425<\/td>\n<td>-340<\/td>\n<td>-265<\/td>\n<td>-180<\/td>\n<td>-140<\/td>\n<td>-118<\/td>\n<td>-100<\/td>\n<td>0<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p style=\"margin: 10px 0;\">Utilisez les \u00e9carts pour d\u00e9terminer l'ajustement\u00a0: positifs pour le jeu interne, n\u00e9gatifs pour le jeu externe afin d'obtenir l'interf\u00e9rence ou le jeu souhait\u00e9.<\/p>\n<\/div>\n<div style=\"margin-bottom: 40px;\">\n<h2 style=\"color: #444; border-bottom: 1px solid #ddd; padding-bottom: 10px;\">Tol\u00e9rances pour le diam\u00e8tre int\u00e9rieur des filetages internes (T_{D1})<\/h2>\n<p style=\"margin: 10px 0;\">Le tableau 2 sp\u00e9cifie T_{D1} en \u03bcm par pas, pour les grades 4 \u00e0 8. Ceux-ci assurent un d\u00e9gagement de racine appropri\u00e9, emp\u00eachant les interf\u00e9rences.<\/p>\n<div class=\"table-wrapper\" style=\"overflow-x: auto; margin: 20px 0;\">\n<table style=\"width: 100%; border-collapse: collapse;\">\n<thead>\n<tr>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"2\">Pas P (mm)<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" colspan=\"5\">Niveau de tol\u00e9rance<\/th>\n<\/tr>\n<tr>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">4<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">5<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">6<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">7<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">8<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">0.2<\/td>\n<td>38<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">0.25<\/td>\n<td>45<\/td>\n<td>56<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">0.3<\/td>\n<td>53<\/td>\n<td>67<\/td>\n<td>85<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">0.35<\/td>\n<td>63<\/td>\n<td>80<\/td>\n<td>100<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">0.4<\/td>\n<td>71<\/td>\n<td>90<\/td>\n<td>112<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">0.45<\/td>\n<td>80<\/td>\n<td>100<\/td>\n<td>125<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">0.5<\/td>\n<td>90<\/td>\n<td>112<\/td>\n<td>140<\/td>\n<td>180<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">0.6<\/td>\n<td>100<\/td>\n<td>125<\/td>\n<td>160<\/td>\n<td>200<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">0.7<\/td>\n<td>112<\/td>\n<td>140<\/td>\n<td>180<\/td>\n<td>224<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">0.75<\/td>\n<td>118<\/td>\n<td>150<\/td>\n<td>190<\/td>\n<td>236<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">0.8<\/td>\n<td>125<\/td>\n<td>160<\/td>\n<td>200<\/td>\n<td>250<\/td>\n<td>315<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">1<\/td>\n<td>150<\/td>\n<td>190<\/td>\n<td>236<\/td>\n<td>300<\/td>\n<td>375<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">1.25<\/td>\n<td>170<\/td>\n<td>212<\/td>\n<td>265<\/td>\n<td>335<\/td>\n<td>425<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">1.5<\/td>\n<td>190<\/td>\n<td>236<\/td>\n<td>300<\/td>\n<td>375<\/td>\n<td>475<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">1.75<\/td>\n<td>212<\/td>\n<td>265<\/td>\n<td>335<\/td>\n<td>425<\/td>\n<td>530<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">2<\/td>\n<td>236<\/td>\n<td>300<\/td>\n<td>375<\/td>\n<td>475<\/td>\n<td>600<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">2.5<\/td>\n<td>280<\/td>\n<td>355<\/td>\n<td>450<\/td>\n<td>560<\/td>\n<td>710<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">3<\/td>\n<td>315<\/td>\n<td>400<\/td>\n<td>500<\/td>\n<td>630<\/td>\n<td>800<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">3.5<\/td>\n<td>355<\/td>\n<td>450<\/td>\n<td>560<\/td>\n<td>710<\/td>\n<td>900<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">4<\/td>\n<td>375<\/td>\n<td>475<\/td>\n<td>600<\/td>\n<td>750<\/td>\n<td>950<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">4.5<\/td>\n<td>425<\/td>\n<td>530<\/td>\n<td>670<\/td>\n<td>850<\/td>\n<td>1060<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">5<\/td>\n<td>450<\/td>\n<td>560<\/td>\n<td>710<\/td>\n<td>900<\/td>\n<td>1120<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">5.5<\/td>\n<td>475<\/td>\n<td>600<\/td>\n<td>750<\/td>\n<td>950<\/td>\n<td>1180<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">6<\/td>\n<td>500<\/td>\n<td>630<\/td>\n<td>800<\/td>\n<td>1000<\/td>\n<td>1250<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">8<\/td>\n<td>630<\/td>\n<td>800<\/td>\n<td>1000<\/td>\n<td>1250<\/td>\n<td>1600<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p style=\"margin: 10px 0;\">Les qualit\u00e9s sup\u00e9rieures offrent des tol\u00e9rances plus serr\u00e9es, adapt\u00e9es aux ajustements de pr\u00e9cision dans les petits pas.<\/p>\n<\/div>\n<div style=\"margin-bottom: 40px;\">\n<h2 style=\"color: #444; border-bottom: 1px solid #ddd; padding-bottom: 10px;\">Tol\u00e9rances pour le diam\u00e8tre nominal des filetages ext\u00e9rieurs (T_d)<\/h2>\n<p style=\"margin: 10px 0;\">Le tableau 3 d\u00e9finit T_d en \u03bcm par pas, pour les grades 4, 6, 8. Ces valeurs contr\u00f4lent le jeu de cr\u00eate, influen\u00e7ant la r\u00e9sistance du filetage.<\/p>\n<div class=\"table-wrapper\" style=\"overflow-x: auto; margin: 20px 0;\">\n<table style=\"width: 100%; border-collapse: collapse;\">\n<thead>\n<tr>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"2\">Pas P (mm)<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" colspan=\"3\">Niveau de tol\u00e9rance<\/th>\n<\/tr>\n<tr>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">4<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">6<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">8<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">0.2<\/td>\n<td>36<\/td>\n<td>56<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">0.25<\/td>\n<td>42<\/td>\n<td>67<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">0.3<\/td>\n<td>48<\/td>\n<td>75<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">0.35<\/td>\n<td>53<\/td>\n<td>85<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">0.4<\/td>\n<td>60<\/td>\n<td>95<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">0.45<\/td>\n<td>63<\/td>\n<td>100<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">0.5<\/td>\n<td>67<\/td>\n<td>106<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">0.6<\/td>\n<td>80<\/td>\n<td>125<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">0.7<\/td>\n<td>90<\/td>\n<td>140<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">0.75<\/td>\n<td>90<\/td>\n<td>140<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">0.8<\/td>\n<td>95<\/td>\n<td>150<\/td>\n<td>236<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">1<\/td>\n<td>112<\/td>\n<td>180<\/td>\n<td>280<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">1.25<\/td>\n<td>132<\/td>\n<td>212<\/td>\n<td>335<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">1.5<\/td>\n<td>150<\/td>\n<td>236<\/td>\n<td>375<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">1.75<\/td>\n<td>170<\/td>\n<td>265<\/td>\n<td>425<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">2<\/td>\n<td>180<\/td>\n<td>280<\/td>\n<td>450<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">2.5<\/td>\n<td>212<\/td>\n<td>335<\/td>\n<td>530<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">3<\/td>\n<td>236<\/td>\n<td>375<\/td>\n<td>600<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">3.5<\/td>\n<td>265<\/td>\n<td>425<\/td>\n<td>670<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">4<\/td>\n<td>300<\/td>\n<td>475<\/td>\n<td>750<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">4.5<\/td>\n<td>315<\/td>\n<td>500<\/td>\n<td>800<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">5<\/td>\n<td>335<\/td>\n<td>530<\/td>\n<td>850<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">5.5<\/td>\n<td>355<\/td>\n<td>560<\/td>\n<td>900<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">6<\/td>\n<td>375<\/td>\n<td>600<\/td>\n<td>950<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">8<\/td>\n<td>450<\/td>\n<td>710<\/td>\n<td>1180<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p style=\"margin: 10px 0;\">Les grades 4 et 6 sont pour la pr\u00e9cision, le grade 8 pour les ajustements l\u00e2ches dans les pas plus grands.<\/p>\n<\/div>\n<div style=\"margin-bottom: 40px;\">\n<h2 style=\"color: #444; border-bottom: 1px solid #ddd; padding-bottom: 10px;\">Tol\u00e9rances pour le diam\u00e8tre primitif des filetages internes (T_{D2})<\/h2>\n<p style=\"margin: 10px 0;\">Le tableau 4 fournit T_{D2} en \u03bcm, segment\u00e9 par diam\u00e8tre majeur (D) et pas, pour les grades 4 \u00e0 8. Les tol\u00e9rances de diam\u00e8tre de pas sont critiques pour la capacit\u00e9 de charge.<\/p>\n<div class=\"table-wrapper\" style=\"overflow-x: auto; margin: 20px 0;\">\n<table style=\"width: 100%; border-collapse: collapse;\">\n<thead>\n<tr>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" colspan=\"2\">Diam\u00e8tre majeur D (mm)<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"2\">Pas P (mm)<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" colspan=\"5\">Niveau de tol\u00e9rance<\/th>\n<\/tr>\n<tr>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">&gt;<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">\u2264<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">4<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">5<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">6<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">7<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">8<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"3\">0.99<\/td>\n<td rowspan=\"3\">1.4<\/td>\n<td>0.2<\/td>\n<td>40<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td>0.25<\/td>\n<td>45<\/td>\n<td>56<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td>0.3<\/td>\n<td>48<\/td>\n<td>60<\/td>\n<td>75<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"5\">1.4<\/td>\n<td rowspan=\"5\">2.8<\/td>\n<td>0.2<\/td>\n<td>42<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td>0.25<\/td>\n<td>48<\/td>\n<td>60<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td>0.35<\/td>\n<td>53<\/td>\n<td>67<\/td>\n<td>85<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td>0.4<\/td>\n<td>56<\/td>\n<td>71<\/td>\n<td>90<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td>0.45<\/td>\n<td>60<\/td>\n<td>75<\/td>\n<td>95<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"6\">2.8<\/td>\n<td rowspan=\"6\">5.6<\/td>\n<td>0.35<\/td>\n<td>56<\/td>\n<td>71<\/td>\n<td>90<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td>0.5<\/td>\n<td>63<\/td>\n<td>80<\/td>\n<td>100<\/td>\n<td>125<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td>0.6<\/td>\n<td>71<\/td>\n<td>90<\/td>\n<td>112<\/td>\n<td>140<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td>0.7<\/td>\n<td>75<\/td>\n<td>95<\/td>\n<td>118<\/td>\n<td>150<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td>0.75<\/td>\n<td>75<\/td>\n<td>95<\/td>\n<td>118<\/td>\n<td>150<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td>0.8<\/td>\n<td>80<\/td>\n<td>100<\/td>\n<td>125<\/td>\n<td>160<\/td>\n<td>200<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"4\">5.6<\/td>\n<td rowspan=\"4\">11.2<\/td>\n<td>0.75<\/td>\n<td>85<\/td>\n<td>106<\/td>\n<td>132<\/td>\n<td>170<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td>1<\/td>\n<td>95<\/td>\n<td>118<\/td>\n<td>150<\/td>\n<td>190<\/td>\n<td>236<\/td>\n<\/tr>\n<tr>\n<td>1.25<\/td>\n<td>100<\/td>\n<td>125<\/td>\n<td>160<\/td>\n<td>200<\/td>\n<td>250<\/td>\n<\/tr>\n<tr>\n<td>1.5<\/td>\n<td>112<\/td>\n<td>140<\/td>\n<td>180<\/td>\n<td>224<\/td>\n<td>280<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"6\">11.2<\/td>\n<td rowspan=\"6\">22.4<\/td>\n<td>1<\/td>\n<td>100<\/td>\n<td>125<\/td>\n<td>160<\/td>\n<td>200<\/td>\n<td>250<\/td>\n<\/tr>\n<tr>\n<td>1.25<\/td>\n<td>112<\/td>\n<td>140<\/td>\n<td>180<\/td>\n<td>224<\/td>\n<td>280<\/td>\n<\/tr>\n<tr>\n<td>1.5<\/td>\n<td>118<\/td>\n<td>150<\/td>\n<td>190<\/td>\n<td>236<\/td>\n<td>300<\/td>\n<\/tr>\n<tr>\n<td>1.75<\/td>\n<td>125<\/td>\n<td>160<\/td>\n<td>200<\/td>\n<td>250<\/td>\n<td>315<\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td>132<\/td>\n<td>170<\/td>\n<td>212<\/td>\n<td>265<\/td>\n<td>335<\/td>\n<\/tr>\n<tr>\n<td>2.5<\/td>\n<td>140<\/td>\n<td>180<\/td>\n<td>224<\/td>\n<td>280<\/td>\n<td>355<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"7\">22.4<\/td>\n<td rowspan=\"7\">45<\/td>\n<td>1<\/td>\n<td>106<\/td>\n<td>132<\/td>\n<td>170<\/td>\n<td>212<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td>1.5<\/td>\n<td>125<\/td>\n<td>160<\/td>\n<td>200<\/td>\n<td>250<\/td>\n<td>315<\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td>140<\/td>\n<td>180<\/td>\n<td>224<\/td>\n<td>280<\/td>\n<td>355<\/td>\n<\/tr>\n<tr>\n<td>3<\/td>\n<td>170<\/td>\n<td>212<\/td>\n<td>265<\/td>\n<td>335<\/td>\n<td>425<\/td>\n<\/tr>\n<tr>\n<td>3.5<\/td>\n<td>180<\/td>\n<td>224<\/td>\n<td>280<\/td>\n<td>355<\/td>\n<td>450<\/td>\n<\/tr>\n<tr>\n<td>4<\/td>\n<td>190<\/td>\n<td>236<\/td>\n<td>300<\/td>\n<td>375<\/td>\n<td>475<\/td>\n<\/tr>\n<tr>\n<td>4.5<\/td>\n<td>200<\/td>\n<td>250<\/td>\n<td>315<\/td>\n<td>400<\/td>\n<td>500<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"7\">45<\/td>\n<td rowspan=\"7\">90<\/td>\n<td>1.5<\/td>\n<td>132<\/td>\n<td>170<\/td>\n<td>212<\/td>\n<td>265<\/td>\n<td>335<\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td>150<\/td>\n<td>190<\/td>\n<td>236<\/td>\n<td>300<\/td>\n<td>375<\/td>\n<\/tr>\n<tr>\n<td>3<\/td>\n<td>180<\/td>\n<td>224<\/td>\n<td>280<\/td>\n<td>355<\/td>\n<td>450<\/td>\n<\/tr>\n<tr>\n<td>4<\/td>\n<td>200<\/td>\n<td>250<\/td>\n<td>315<\/td>\n<td>400<\/td>\n<td>500<\/td>\n<\/tr>\n<tr>\n<td>5<\/td>\n<td>212<\/td>\n<td>265<\/td>\n<td>335<\/td>\n<td>425<\/td>\n<td>530<\/td>\n<\/tr>\n<tr>\n<td>5.5<\/td>\n<td>224<\/td>\n<td>280<\/td>\n<td>355<\/td>\n<td>450<\/td>\n<td>560<\/td>\n<\/tr>\n<tr>\n<td>6<\/td>\n<td>236<\/td>\n<td>300<\/td>\n<td>375<\/td>\n<td>475<\/td>\n<td>600<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"5\">90<\/td>\n<td rowspan=\"5\">180<\/td>\n<td>2<\/td>\n<td>160<\/td>\n<td>200<\/td>\n<td>250<\/td>\n<td>315<\/td>\n<td>400<\/td>\n<\/tr>\n<tr>\n<td>3<\/td>\n<td>190<\/td>\n<td>236<\/td>\n<td>300<\/td>\n<td>375<\/td>\n<td>475<\/td>\n<\/tr>\n<tr>\n<td>4<\/td>\n<td>212<\/td>\n<td>265<\/td>\n<td>335<\/td>\n<td>425<\/td>\n<td>530<\/td>\n<\/tr>\n<tr>\n<td>6<\/td>\n<td>250<\/td>\n<td>315<\/td>\n<td>400<\/td>\n<td>500<\/td>\n<td>630<\/td>\n<\/tr>\n<tr>\n<td>8<\/td>\n<td>280<\/td>\n<td>355<\/td>\n<td>450<\/td>\n<td>560<\/td>\n<td>710<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"4\">180<\/td>\n<td rowspan=\"4\">355<\/td>\n<td>3<\/td>\n<td>212<\/td>\n<td>265<\/td>\n<td>335<\/td>\n<td>425<\/td>\n<td>530<\/td>\n<\/tr>\n<tr>\n<td>4<\/td>\n<td>236<\/td>\n<td>300<\/td>\n<td>375<\/td>\n<td>475<\/td>\n<td>600<\/td>\n<\/tr>\n<tr>\n<td>6<\/td>\n<td>265<\/td>\n<td>335<\/td>\n<td>425<\/td>\n<td>530<\/td>\n<td>670<\/td>\n<\/tr>\n<tr>\n<td>8<\/td>\n<td>300<\/td>\n<td>375<\/td>\n<td>475<\/td>\n<td>600<\/td>\n<td>750<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p style=\"margin: 10px 0;\">Les tol\u00e9rances augmentent avec le diam\u00e8tre et le pas, permettant ainsi des variations de fabrication pour les filetages de plus grand diam\u00e8tre.<\/p>\n<\/div>\n<div style=\"margin-bottom: 40px;\">\n<h2 style=\"color: #444; border-bottom: 1px solid #ddd; padding-bottom: 10px;\">Tol\u00e9rances pour le diam\u00e8tre primitif des filetages ext\u00e9rieurs (T_{d2})<\/h2>\n<p style=\"margin: 10px 0;\">Le tableau 5 d\u00e9taille T_{d2} en \u03bcm, par diam\u00e8tre majeur (d) et pas, pour les grades 3 \u00e0 9. Ceux-ci sont essentiels pour l'engagement du filetage et la r\u00e9partition de la charge.<\/p>\n<div class=\"table-wrapper\" style=\"overflow-x: auto; margin: 20px 0;\">\n<table style=\"width: 100%; border-collapse: collapse;\">\n<thead>\n<tr>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" colspan=\"2\">Diam\u00e8tre majeur d (mm)<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"2\">Pas P (mm)<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" colspan=\"7\">Niveau de tol\u00e9rance<\/th>\n<\/tr>\n<tr>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">&gt;<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">\u2264<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">3<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">4<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">5<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">6<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">7<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">8<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">9<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"3\">0.99<\/td>\n<td rowspan=\"3\">1.4<\/td>\n<td>0.2<\/td>\n<td>24<\/td>\n<td>30<\/td>\n<td>38<\/td>\n<td>48<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td>0.25<\/td>\n<td>26<\/td>\n<td>34<\/td>\n<td>42<\/td>\n<td>53<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td>0.3<\/td>\n<td>28<\/td>\n<td>36<\/td>\n<td>45<\/td>\n<td>56<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"5\">1.4<\/td>\n<td rowspan=\"5\">2.8<\/td>\n<td>0.2<\/td>\n<td>25<\/td>\n<td>32<\/td>\n<td>40<\/td>\n<td>50<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td>0.25<\/td>\n<td>28<\/td>\n<td>36<\/td>\n<td>45<\/td>\n<td>56<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td>0.35<\/td>\n<td>32<\/td>\n<td>40<\/td>\n<td>50<\/td>\n<td>63<\/td>\n<td>80<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td>0.4<\/td>\n<td>34<\/td>\n<td>42<\/td>\n<td>53<\/td>\n<td>67<\/td>\n<td>85<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td>0.45<\/td>\n<td>36<\/td>\n<td>45<\/td>\n<td>56<\/td>\n<td>71<\/td>\n<td>90<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"6\">2.8<\/td>\n<td rowspan=\"6\">5.6<\/td>\n<td>0.35<\/td>\n<td>34<\/td>\n<td>42<\/td>\n<td>53<\/td>\n<td>67<\/td>\n<td>85<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td>0.5<\/td>\n<td>38<\/td>\n<td>48<\/td>\n<td>60<\/td>\n<td>75<\/td>\n<td>95<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td>0.6<\/td>\n<td>42<\/td>\n<td>53<\/td>\n<td>67<\/td>\n<td>85<\/td>\n<td>106<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td>0.7<\/td>\n<td>45<\/td>\n<td>56<\/td>\n<td>71<\/td>\n<td>90<\/td>\n<td>112<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td>0.75<\/td>\n<td>45<\/td>\n<td>56<\/td>\n<td>71<\/td>\n<td>90<\/td>\n<td>112<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td>0.8<\/td>\n<td>48<\/td>\n<td>60<\/td>\n<td>75<\/td>\n<td>95<\/td>\n<td>118<\/td>\n<td>150<\/td>\n<td>190<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"4\">5.6<\/td>\n<td rowspan=\"4\">11.2<\/td>\n<td>0.75<\/td>\n<td>50<\/td>\n<td>63<\/td>\n<td>80<\/td>\n<td>100<\/td>\n<td>125<\/td>\n<td>–<\/td>\n<td>–<\/td>\n<\/tr>\n<tr>\n<td>1<\/td>\n<td>56<\/td>\n<td>71<\/td>\n<td>90<\/td>\n<td>112<\/td>\n<td>140<\/td>\n<td>180<\/td>\n<td>224<\/td>\n<\/tr>\n<tr>\n<td>1.25<\/td>\n<td>60<\/td>\n<td>75<\/td>\n<td>95<\/td>\n<td>118<\/td>\n<td>150<\/td>\n<td>190<\/td>\n<td>236<\/td>\n<\/tr>\n<tr>\n<td>1.5<\/td>\n<td>67<\/td>\n<td>85<\/td>\n<td>106<\/td>\n<td>132<\/td>\n<td>170<\/td>\n<td>212<\/td>\n<td>265<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"6\">11.2<\/td>\n<td rowspan=\"6\">22.4<\/td>\n<td>1<\/td>\n<td>60<\/td>\n<td>75<\/td>\n<td>95<\/td>\n<td>118<\/td>\n<td>150<\/td>\n<td>190<\/td>\n<td>236<\/td>\n<\/tr>\n<tr>\n<td>1.25<\/td>\n<td>67<\/td>\n<td>85<\/td>\n<td>106<\/td>\n<td>132<\/td>\n<td>170<\/td>\n<td>212<\/td>\n<td>265<\/td>\n<\/tr>\n<tr>\n<td>1.5<\/td>\n<td>71<\/td>\n<td>90<\/td>\n<td>112<\/td>\n<td>140<\/td>\n<td>180<\/td>\n<td>224<\/td>\n<td>280<\/td>\n<\/tr>\n<tr>\n<td>1.75<\/td>\n<td>75<\/td>\n<td>95<\/td>\n<td>118<\/td>\n<td>150<\/td>\n<td>190<\/td>\n<td>236<\/td>\n<td>300<\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td>80<\/td>\n<td>100<\/td>\n<td>125<\/td>\n<td>160<\/td>\n<td>200<\/td>\n<td>250<\/td>\n<td>315<\/td>\n<\/tr>\n<tr>\n<td>2.5<\/td>\n<td>85<\/td>\n<td>106<\/td>\n<td>132<\/td>\n<td>170<\/td>\n<td>212<\/td>\n<td>265<\/td>\n<td>335<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"7\">22.4<\/td>\n<td rowspan=\"7\">45<\/td>\n<td>1<\/td>\n<td>63<\/td>\n<td>80<\/td>\n<td>100<\/td>\n<td>125<\/td>\n<td>160<\/td>\n<td>200<\/td>\n<td>250<\/td>\n<\/tr>\n<tr>\n<td>1.5<\/td>\n<td>75<\/td>\n<td>95<\/td>\n<td>118<\/td>\n<td>150<\/td>\n<td>190<\/td>\n<td>236<\/td>\n<td>300<\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td>85<\/td>\n<td>106<\/td>\n<td>132<\/td>\n<td>170<\/td>\n<td>212<\/td>\n<td>265<\/td>\n<td>335<\/td>\n<\/tr>\n<tr>\n<td>3<\/td>\n<td>100<\/td>\n<td>125<\/td>\n<td>160<\/td>\n<td>200<\/td>\n<td>250<\/td>\n<td>315<\/td>\n<td>400<\/td>\n<\/tr>\n<tr>\n<td>3.5<\/td>\n<td>106<\/td>\n<td>132<\/td>\n<td>170<\/td>\n<td>212<\/td>\n<td>265<\/td>\n<td>335<\/td>\n<td>425<\/td>\n<\/tr>\n<tr>\n<td>4<\/td>\n<td>112<\/td>\n<td>140<\/td>\n<td>180<\/td>\n<td>224<\/td>\n<td>280<\/td>\n<td>355<\/td>\n<td>450<\/td>\n<\/tr>\n<tr>\n<td>4.5<\/td>\n<td>118<\/td>\n<td>150<\/td>\n<td>190<\/td>\n<td>236<\/td>\n<td>300<\/td>\n<td>375<\/td>\n<td>475<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"7\">45<\/td>\n<td rowspan=\"7\">90<\/td>\n<td>1.5<\/td>\n<td>80<\/td>\n<td>100<\/td>\n<td>125<\/td>\n<td>160<\/td>\n<td>200<\/td>\n<td>250<\/td>\n<td>315<\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td>90<\/td>\n<td>112<\/td>\n<td>140<\/td>\n<td>180<\/td>\n<td>224<\/td>\n<td>280<\/td>\n<td>355<\/td>\n<\/tr>\n<tr>\n<td>3<\/td>\n<td>106<\/td>\n<td>132<\/td>\n<td>170<\/td>\n<td>212<\/td>\n<td>265<\/td>\n<td>335<\/td>\n<td>425<\/td>\n<\/tr>\n<tr>\n<td>4<\/td>\n<td>118<\/td>\n<td>150<\/td>\n<td>190<\/td>\n<td>236<\/td>\n<td>300<\/td>\n<td>375<\/td>\n<td>475<\/td>\n<\/tr>\n<tr>\n<td>5<\/td>\n<td>125<\/td>\n<td>160<\/td>\n<td>200<\/td>\n<td>250<\/td>\n<td>315<\/td>\n<td>400<\/td>\n<td>500<\/td>\n<\/tr>\n<tr>\n<td>5.5<\/td>\n<td>132<\/td>\n<td>170<\/td>\n<td>212<\/td>\n<td>265<\/td>\n<td>335<\/td>\n<td>425<\/td>\n<td>530<\/td>\n<\/tr>\n<tr>\n<td>6<\/td>\n<td>140<\/td>\n<td>180<\/td>\n<td>224<\/td>\n<td>280<\/td>\n<td>355<\/td>\n<td>450<\/td>\n<td>560<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"5\">90<\/td>\n<td rowspan=\"5\">180<\/td>\n<td>2<\/td>\n<td>95<\/td>\n<td>118<\/td>\n<td>150<\/td>\n<td>190<\/td>\n<td>236<\/td>\n<td>300<\/td>\n<td>375<\/td>\n<\/tr>\n<tr>\n<td>3<\/td>\n<td>112<\/td>\n<td>140<\/td>\n<td>180<\/td>\n<td>224<\/td>\n<td>280<\/td>\n<td>355<\/td>\n<td>450<\/td>\n<\/tr>\n<tr>\n<td>4<\/td>\n<td>125<\/td>\n<td>160<\/td>\n<td>200<\/td>\n<td>250<\/td>\n<td>315<\/td>\n<td>400<\/td>\n<td>500<\/td>\n<\/tr>\n<tr>\n<td>6<\/td>\n<td>150<\/td>\n<td>190<\/td>\n<td>236<\/td>\n<td>300<\/td>\n<td>375<\/td>\n<td>475<\/td>\n<td>600<\/td>\n<\/tr>\n<tr>\n<td>8<\/td>\n<td>170<\/td>\n<td>212<\/td>\n<td>265<\/td>\n<td>335<\/td>\n<td>425<\/td>\n<td>530<\/td>\n<td>670<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"4\">180<\/td>\n<td rowspan=\"4\">355<\/td>\n<td>3<\/td>\n<td>125<\/td>\n<td>160<\/td>\n<td>200<\/td>\n<td>250<\/td>\n<td>315<\/td>\n<td>400<\/td>\n<td>500<\/td>\n<\/tr>\n<tr>\n<td>4<\/td>\n<td>140<\/td>\n<td>180<\/td>\n<td>224<\/td>\n<td>280<\/td>\n<td>355<\/td>\n<td>450<\/td>\n<td>560<\/td>\n<\/tr>\n<tr>\n<td>6<\/td>\n<td>160<\/td>\n<td>200<\/td>\n<td>250<\/td>\n<td>315<\/td>\n<td>400<\/td>\n<td>500<\/td>\n<td>630<\/td>\n<\/tr>\n<tr>\n<td>8<\/td>\n<td>180<\/td>\n<td>224<\/td>\n<td>280<\/td>\n<td>355<\/td>\n<td>450<\/td>\n<td>560<\/td>\n<td>710<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p style=\"margin: 10px 0;\">Le grade 3 est destin\u00e9 \u00e0 l'ultra-pr\u00e9cision, jusqu'au grade 9 aux ajustements grossiers dans les grands diam\u00e8tres.<\/p>\n<\/div>\n<div style=\"margin-bottom: 40px;\">\n<h2 style=\"color: #444; border-bottom: 1px solid #ddd; padding-bottom: 10px;\">Longueurs d'engagement du filetage<\/h2>\n<p style=\"margin: 10px 0;\">Le tableau 6 d\u00e9finit les longueurs d'engagement en mm en fonction du diam\u00e8tre ext\u00e9rieur et du pas, regroup\u00e9es comme S (courte), N (normale) et L (longue). Ces valeurs influent sur le choix des tol\u00e9rances pour la capacit\u00e9 de charge.<\/p>\n<div class=\"table-wrapper\" style=\"overflow-x: auto; margin: 20px 0;\">\n<table style=\"width: 100%; border-collapse: collapse;\">\n<thead>\n<tr>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" colspan=\"2\">Diam\u00e8tre majeur D\/d (mm)<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"3\">Pas P (mm)<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" colspan=\"1\" rowspan=\"2\">S \u2264<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" colspan=\"2\">N<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" colspan=\"1\" rowspan=\"2\">L &gt;<\/th>\n<\/tr>\n<tr>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">&gt;<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">\u2264<\/th>\n<\/tr>\n<tr>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">&gt;<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\">\u2264<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"3\">0.99<\/td>\n<td rowspan=\"3\">1.4<\/td>\n<td>0.2<\/td>\n<td>0.5<\/td>\n<td>0.5<\/td>\n<td>1.4<\/td>\n<td>1.4<\/td>\n<\/tr>\n<tr>\n<td>0.25<\/td>\n<td>0.6<\/td>\n<td>0.6<\/td>\n<td>1.7<\/td>\n<td>1.7<\/td>\n<\/tr>\n<tr>\n<td>0.3<\/td>\n<td>0.7<\/td>\n<td>0.7<\/td>\n<td>2<\/td>\n<td>2<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"5\">1.4<\/td>\n<td rowspan=\"5\">2.8<\/td>\n<td>0.2<\/td>\n<td>0.5<\/td>\n<td>0.5<\/td>\n<td>1.5<\/td>\n<td>1.5<\/td>\n<\/tr>\n<tr>\n<td>0.25<\/td>\n<td>0.6<\/td>\n<td>0.6<\/td>\n<td>1.9<\/td>\n<td>1.9<\/td>\n<\/tr>\n<tr>\n<td>0.35<\/td>\n<td>0.8<\/td>\n<td>0.8<\/td>\n<td>2.6<\/td>\n<td>2.6<\/td>\n<\/tr>\n<tr>\n<td>0.4<\/td>\n<td>1<\/td>\n<td>1<\/td>\n<td>3<\/td>\n<td>3<\/td>\n<\/tr>\n<tr>\n<td>0.45<\/td>\n<td>1.3<\/td>\n<td>1.3<\/td>\n<td>3.8<\/td>\n<td>3.8<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"6\">2.8<\/td>\n<td rowspan=\"6\">5.6<\/td>\n<td>0.35<\/td>\n<td>1<\/td>\n<td>1<\/td>\n<td>3<\/td>\n<td>3<\/td>\n<\/tr>\n<tr>\n<td>0.5<\/td>\n<td>1.5<\/td>\n<td>1.5<\/td>\n<td>4.5<\/td>\n<td>4.5<\/td>\n<\/tr>\n<tr>\n<td>0.6<\/td>\n<td>1.7<\/td>\n<td>1.7<\/td>\n<td>5<\/td>\n<td>5<\/td>\n<\/tr>\n<tr>\n<td>0.7<\/td>\n<td>2<\/td>\n<td>2<\/td>\n<td>6<\/td>\n<td>6<\/td>\n<\/tr>\n<tr>\n<td>0.75<\/td>\n<td>2.2<\/td>\n<td>2.2<\/td>\n<td>6.7<\/td>\n<td>6.7<\/td>\n<\/tr>\n<tr>\n<td>0.8<\/td>\n<td>2.5<\/td>\n<td>2.5<\/td>\n<td>7.5<\/td>\n<td>7.5<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"4\">5.6<\/td>\n<td rowspan=\"4\">11.2<\/td>\n<td>0.75<\/td>\n<td>2.4<\/td>\n<td>2.4<\/td>\n<td>7.1<\/td>\n<td>7.1<\/td>\n<\/tr>\n<tr>\n<td>1<\/td>\n<td>3<\/td>\n<td>3<\/td>\n<td>9<\/td>\n<td>9<\/td>\n<\/tr>\n<tr>\n<td>1.25<\/td>\n<td>4<\/td>\n<td>4<\/td>\n<td>12<\/td>\n<td>12<\/td>\n<\/tr>\n<tr>\n<td>1.5<\/td>\n<td>5<\/td>\n<td>5<\/td>\n<td>15<\/td>\n<td>15<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"6\">11.2<\/td>\n<td rowspan=\"6\">22.4<\/td>\n<td>1<\/td>\n<td>3.8<\/td>\n<td>3.8<\/td>\n<td>11<\/td>\n<td>11<\/td>\n<\/tr>\n<tr>\n<td>1.25<\/td>\n<td>4.5<\/td>\n<td>4.5<\/td>\n<td>13<\/td>\n<td>13<\/td>\n<\/tr>\n<tr>\n<td>1.5<\/td>\n<td>5.6<\/td>\n<td>5.6<\/td>\n<td>16<\/td>\n<td>16<\/td>\n<\/tr>\n<tr>\n<td>1.75<\/td>\n<td>6<\/td>\n<td>6<\/td>\n<td>18<\/td>\n<td>18<\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td>8<\/td>\n<td>8<\/td>\n<td>24<\/td>\n<td>24<\/td>\n<\/tr>\n<tr>\n<td>2.5<\/td>\n<td>10<\/td>\n<td>10<\/td>\n<td>30<\/td>\n<td>30<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"7\">22.4<\/td>\n<td rowspan=\"7\">45<\/td>\n<td>1<\/td>\n<td>4<\/td>\n<td>4<\/td>\n<td>12<\/td>\n<td>12<\/td>\n<\/tr>\n<tr>\n<td>1.5<\/td>\n<td>6.3<\/td>\n<td>6.3<\/td>\n<td>19<\/td>\n<td>19<\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td>8.5<\/td>\n<td>8.5<\/td>\n<td>25<\/td>\n<td>25<\/td>\n<\/tr>\n<tr>\n<td>3<\/td>\n<td>12<\/td>\n<td>12<\/td>\n<td>36<\/td>\n<td>36<\/td>\n<\/tr>\n<tr>\n<td>3.5<\/td>\n<td>15<\/td>\n<td>15<\/td>\n<td>45<\/td>\n<td>45<\/td>\n<\/tr>\n<tr>\n<td>4<\/td>\n<td>18<\/td>\n<td>18<\/td>\n<td>53<\/td>\n<td>53<\/td>\n<\/tr>\n<tr>\n<td>4.5<\/td>\n<td>21<\/td>\n<td>21<\/td>\n<td>63<\/td>\n<td>63<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"7\">45<\/td>\n<td rowspan=\"7\">90<\/td>\n<td>1.5<\/td>\n<td>7.5<\/td>\n<td>7.5<\/td>\n<td>22<\/td>\n<td>22<\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td>9.5<\/td>\n<td>9.5<\/td>\n<td>28<\/td>\n<td>28<\/td>\n<\/tr>\n<tr>\n<td>3<\/td>\n<td>15<\/td>\n<td>15<\/td>\n<td>45<\/td>\n<td>45<\/td>\n<\/tr>\n<tr>\n<td>4<\/td>\n<td>19<\/td>\n<td>19<\/td>\n<td>56<\/td>\n<td>56<\/td>\n<\/tr>\n<tr>\n<td>5<\/td>\n<td>24<\/td>\n<td>24<\/td>\n<td>71<\/td>\n<td>71<\/td>\n<\/tr>\n<tr>\n<td>5.5<\/td>\n<td>28<\/td>\n<td>28<\/td>\n<td>85<\/td>\n<td>85<\/td>\n<\/tr>\n<tr>\n<td>6<\/td>\n<td>32<\/td>\n<td>32<\/td>\n<td>95<\/td>\n<td>95<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"5\">90<\/td>\n<td rowspan=\"5\">180<\/td>\n<td>2<\/td>\n<td>12<\/td>\n<td>12<\/td>\n<td>36<\/td>\n<td>36<\/td>\n<\/tr>\n<tr>\n<td>3<\/td>\n<td>18<\/td>\n<td>18<\/td>\n<td>53<\/td>\n<td>53<\/td>\n<\/tr>\n<tr>\n<td>4<\/td>\n<td>24<\/td>\n<td>24<\/td>\n<td>71<\/td>\n<td>71<\/td>\n<\/tr>\n<tr>\n<td>6<\/td>\n<td>36<\/td>\n<td>36<\/td>\n<td>106<\/td>\n<td>106<\/td>\n<\/tr>\n<tr>\n<td>8<\/td>\n<td>45<\/td>\n<td>45<\/td>\n<td>132<\/td>\n<td>132<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\" rowspan=\"4\">180<\/td>\n<td rowspan=\"4\">355<\/td>\n<td>3<\/td>\n<td>20<\/td>\n<td>20<\/td>\n<td>60<\/td>\n<td>60<\/td>\n<\/tr>\n<tr>\n<td>4<\/td>\n<td>26<\/td>\n<td>26<\/td>\n<td>80<\/td>\n<td>80<\/td>\n<\/tr>\n<tr>\n<td>6<\/td>\n<td>40<\/td>\n<td>40<\/td>\n<td>118<\/td>\n<td>118<\/td>\n<\/tr>\n<tr>\n<td>8<\/td>\n<td>50<\/td>\n<td>50<\/td>\n<td>150<\/td>\n<td>150<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p style=\"margin: 10px 0;\">Choisissez le groupe en fonction de l'application\u00a0: S pour les missions courtes, L pour les charges \u00e9lev\u00e9es.<\/p>\n<\/div>\n<div style=\"margin-bottom: 40px;\">\n<h2 style=\"color: #444; border-bottom: 1px solid #ddd; padding-bottom: 10px;\">Zones de tol\u00e9rance pr\u00e9f\u00e9r\u00e9es<\/h2>\n<p style=\"margin: 10px 0;\">Les zones de tol\u00e9rance combinent \u00e9cart et tol\u00e9rance pour les ajustements courants. Pour les filetages int\u00e9rieurs\u00a0: 4G, 5G, 6G, 4H, 5H, 6H, 7H, 8H. Pour les filetages ext\u00e9rieurs\u00a0: 4H, 5G\/6G, 6E, 6F, 6G, 6H, 7G\/6G, 8G. Exemple\u00a0: 6H\/6G pour un ajustement avec jeu moyen.<\/p>\n<p style=\"margin: 10px 0;\">Ces zones facilitent la s\u00e9lection des normes, garantissant la compatibilit\u00e9 dans les cha\u00eenes d'approvisionnement mondiales.<\/p>\n<\/div>\n<div style=\"margin-bottom: 40px;\">\n<h2 style=\"color: #444; border-bottom: 1px solid #ddd; padding-bottom: 10px;\">Foire aux questions (FAQ)<\/h2>\n<hr \/>\n<ol style=\"margin: 10px 0 10px 20px;\">\n<li style=\"list-style-type: none;\">\n<ol style=\"margin: 10px 0 10px 20px;\">\n<li><strong>Quel est le r\u00f4le des \u00e9carts fondamentaux ?<\/strong><br \/>\nIls positionnent la zone de tol\u00e9rance, d\u00e9terminant le type d'ajustement : EI positif pour un jeu interne, es n\u00e9gatif pour un jeu externe.<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<hr \/>\n<ol style=\"margin: 10px 0 10px 20px;\">\n<li style=\"list-style-type: none;\">\n<ol style=\"margin: 10px 0 10px 20px;\">\n<li><strong>Comment s\u00e9lectionner le groupe de dur\u00e9e d'engagement\u00a0?<\/strong><br \/>\nChoisissez S pour court, N pour normal, L pour long en fonction de la charge et des vibrations ; L offre une meilleure r\u00e9sistance mais n\u00e9cessite des tol\u00e9rances plus serr\u00e9es.<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<hr \/>\n<ol style=\"margin: 10px 0 10px 20px;\">\n<li style=\"list-style-type: none;\">\n<ol style=\"margin: 10px 0 10px 20px;\">\n<li><strong>Pourquoi les tol\u00e9rances de diam\u00e8tre primitif sont-elles critiques\u00a0?<\/strong><br \/>\nElles contr\u00f4lent la surface de contact, influen\u00e7ant la r\u00e9partition de la charge et la r\u00e9sistance \u00e0 la fatigue ; les grades plus serr\u00e9s emp\u00eachent le desserrage.<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<hr \/>\n<ol style=\"margin: 10px 0 10px 20px;\">\n<li style=\"list-style-type: none;\">\n<ol style=\"margin: 10px 0 10px 20px;\">\n<li><strong>Quelle est une zone de tol\u00e9rance pr\u00e9f\u00e9r\u00e9e comme 6H\/6g ?<\/strong><br \/>\nIl combine la classe 6 avec des \u00e9carts H\/g pour un ajustement de jeu de pr\u00e9cision moyenne, largement utilis\u00e9 en ing\u00e9nierie g\u00e9n\u00e9rale.<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<hr \/>\n<ol style=\"margin: 10px 0 10px 20px;\">\n<li style=\"list-style-type: none;\">\n<ol style=\"margin: 10px 0 10px 20px;\">\n<li><strong>Comment les tol\u00e9rances varient-elles en fonction du pas et du diam\u00e8tre\u00a0?<\/strong><br \/>\nLeur nombre et leur diam\u00e8tre augmentent afin de relever les d\u00e9fis de fabrication tout en conservant leur fonctionnalit\u00e9.<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<hr \/>\n<ol style=\"margin: 10px 0 10px 20px;\">\n<li style=\"list-style-type: none;\">\n<ol style=\"margin: 10px 0 10px 20px;\">\n<li><strong>Cette norme peut-elle s'appliquer aux filetages rev\u00eatus\u00a0?<\/strong><br \/>\nOui, avec des ajustements ; d\u00e9signer par exemple 6g (avant rev\u00eatement) pour l'ajustement apr\u00e8s rev\u00eatement conform\u00e9ment aux directives de l'annexe.<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<hr \/>\n<\/div>\n<p>&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>Introduction to the Standard GB\/T 197-2018 specifies tolerances for general purpose metric screw threads, ensuring interchangeability and performance in mechanical applications. This standard defines fundamental deviations, diameter tolerances, engagement lengths, and preferred zones for internal and external threads, applicable to industries like automotive, aerospace, and machinery. Tolerances are categorized by grades (3 to 9), with [&hellip;]<\/p>","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[220],"tags":[],"class_list":["post-5751","post","type-post","status-publish","format-standard","hentry","category-technical-documentation-and-references"],"_links":{"self":[{"href":"https:\/\/korea-transmission.com\/fr\/wp-json\/wp\/v2\/posts\/5751","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/korea-transmission.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/korea-transmission.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/korea-transmission.com\/fr\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/korea-transmission.com\/fr\/wp-json\/wp\/v2\/comments?post=5751"}],"version-history":[{"count":2,"href":"https:\/\/korea-transmission.com\/fr\/wp-json\/wp\/v2\/posts\/5751\/revisions"}],"predecessor-version":[{"id":5753,"href":"https:\/\/korea-transmission.com\/fr\/wp-json\/wp\/v2\/posts\/5751\/revisions\/5753"}],"wp:attachment":[{"href":"https:\/\/korea-transmission.com\/fr\/wp-json\/wp\/v2\/media?parent=5751"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/korea-transmission.com\/fr\/wp-json\/wp\/v2\/categories?post=5751"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/korea-transmission.com\/fr\/wp-json\/wp\/v2\/tags?post=5751"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}