{"id":6954,"date":"2026-06-10T13:18:02","date_gmt":"2026-06-10T13:18:02","guid":{"rendered":"https:\/\/rapidcision.com\/?p=6954"},"modified":"2026-06-08T19:35:49","modified_gmt":"2026-06-08T19:35:49","slug":"cnc-tolerance-chart-iso-2768","status":"publish","type":"post","link":"https:\/\/rapidcision.com\/pt\/cnc-tolerance-chart-iso-2768\/","title":{"rendered":"Tabela de toler\u00e2ncias para usinagem CNC: Explica\u00e7\u00e3o das toler\u00e2ncias gerais da norma ISO 2768"},"content":{"rendered":"<p><i><span style=\"font-weight: 400;\">Revisado pela equipe de engenharia da Rapidcision | \u00daltima atualiza\u00e7\u00e3o: junho de 2026<\/span><\/i><\/p>\n<p><span style=\"font-weight: 400;\">Uma tabela de toler\u00e2ncias para usinagem CNC indica a varia\u00e7\u00e3o permitida para uma dimens\u00e3o que n\u00e3o possua sua pr\u00f3pria toler\u00e2ncia expl\u00edcita. Na maioria dos desenhos de engenharia, esse padr\u00e3o padr\u00e3o \u00e9 derivado da ISO 2768, uma norma internacional que se invoca com uma \u00fanica nota no bloco de t\u00edtulo, como ISO 2768-mK. Essa \u00fanica refer\u00eancia define o desvio permitido para cada caracter\u00edstica de comprimento, di\u00e2metro, \u00e2ngulo e forma sem toler\u00e2ncia na pe\u00e7a, o que mant\u00e9m o desenho organizado e elimina as suposi\u00e7\u00f5es que, de outra forma, levariam cada oficina a interpretar dimens\u00f5es imprecisas de maneiras diferentes.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">As tabelas abaixo apresentam os valores completos da norma ISO 2768 para dimens\u00f5es lineares, raios e chanfros, \u00e2ngulos e caracter\u00edsticas geom\u00e9tricas, em mil\u00edmetros. Utilize-as para interpretar um desenho, para escolher a classe adequada para um novo projeto e para evitar o h\u00e1bito dispendioso de restringir toler\u00e2ncias que n\u00e3o precisam ser t\u00e3o restritas. Aplicamos esses padr\u00f5es em toda a nossa<\/span><a href=\"https:\/\/rapidcision.com\/pt\/cnc-machining\/\"> <span style=\"font-weight: 400;\">Servi\u00e7os de usinagem CNC<\/span><\/a><span style=\"font-weight: 400;\">, e uma legenda clara no bloco de t\u00edtulo torna seu or\u00e7amento e suas pe\u00e7as mais previs\u00edveis.<\/span><\/p>\n<h2><b>O que abrange a norma ISO 2768<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">A norma ISO 2768 \u00e9 publicada pela Organiza\u00e7\u00e3o Internacional de Normaliza\u00e7\u00e3o e \u00e9 a norma de toler\u00e2ncia geral predominante na Europa e na \u00c1sia, reconhecida por fornecedores de CNC em todo o mundo. Na Alemanha, ela tamb\u00e9m \u00e9 publicada como DIN 7168. A norma \u00e9 composta por duas partes que funcionam em conjunto:<\/span><\/p>\n<ul>\n<li><span style=\"font-weight: 400;\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <\/span><b>ISO 2768-1<\/b><span style=\"font-weight: 400;\"> estabelece toler\u00e2ncias gerais para dimens\u00f5es lineares e angulares, incluindo comprimentos, di\u00e2metros, passos, raios externos, alturas de chanfro e \u00e2ngulos. Oferece quatro classes: fina (f), m\u00e9dia (m), grossa (c) e muito grossa (v).<\/span><\/li>\n<li><span style=\"font-weight: 400;\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <\/span><b>ISO 2768-2<\/b><span style=\"font-weight: 400;\"> define toler\u00e2ncias geom\u00e9tricas gerais para retid\u00e3o, planicidade, perpendicularidade, simetria e excentricidade circular. Oferece tr\u00eas classes: H, K e L, sendo H a mais precisa.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Aplica-se a pe\u00e7as fabricadas por usinagem de remo\u00e7\u00e3o de material, como fresagem, torneamento, perfura\u00e7\u00e3o e retifica\u00e7\u00e3o, bem como a pe\u00e7as de chapa met\u00e1lica. N\u00e3o se aplica a toler\u00e2ncias de rosca, rugosidade de superf\u00edcie ou qualquer dimens\u00e3o que j\u00e1 tenha sua pr\u00f3pria toler\u00e2ncia explicitada, uma vez que uma indica\u00e7\u00e3o expl\u00edcita sempre prevalece.<\/span><\/p>\n<h2><b>ISO 2768-1: Dimens\u00f5es lineares<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Desvios permitidos em mil\u00edmetros.<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><span style=\"font-weight: 400;\">Faixa de di\u00e2metros nominais (mm)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Multa (f)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">M\u00e9dio (m)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Grosso (c)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Muito grosso (v)<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">0,5 a 3<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b10,05<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b10,1<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b10,2<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u2014<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">mais de 3 a 6<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b10,05<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b10,1<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b10,3<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b10,5<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">de 6 a 30<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b10,1<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b10,2<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b10,5<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b11,0<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">mais de 30 a 120<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b10,15<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b10,3<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b10,8<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b11,5<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">mais de 120 a 400<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b10,2<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b10,5<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b11,2<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b12,5<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">mais de 400 a 1.000<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b10,3<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b10,8<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b12,0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b14,0<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">mais de 1.000 a 2.000<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b10,5<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b11,2<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b13,0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b16,0<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">entre 2.000 e 4.000<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u2014<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b12,0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b14,0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b18,0<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span style=\"font-weight: 400;\">Para di\u00e2metros nominais inferiores a 0,5 mm, as toler\u00e2ncias s\u00e3o indicadas ao lado da dimens\u00e3o correspondente.<\/span><\/p>\n<h2><b>ISO 2768-1: Raios externos e alturas de chanfro<\/b><\/h2>\n<table>\n<tbody>\n<tr>\n<td><span style=\"font-weight: 400;\">Faixa de di\u00e2metros nominais (mm)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Multa (f)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">M\u00e9dio (m)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Grosso (c)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Muito grosso (v)<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">0,5 a 3<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b10,2<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b10,2<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b10,4<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b10,4<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">mais de 3 a 6<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b10,5<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b10,5<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b11,0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b11,0<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">mais de 6<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b11,0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b11,0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b12,0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b12,0<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><b>ISO 2768-1: Dimens\u00f5es angulares<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Desvio permitido correspondente ao comprimento do lado mais curto do \u00e2ngulo.<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><span style=\"font-weight: 400;\">Comprimento do lado mais curto (mm)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Multa (f)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">M\u00e9dio (m)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Grosso (c)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Muito grosso (v)<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">at\u00e9 10<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b11\u00b0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b11\u00b0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b11\u00b030\u2032<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b13\u00b0<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">entre 10 e 50<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b10\u00b030\u2032<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b10\u00b030\u2032<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b11\u00b0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b12\u00b0<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">mais de 50 a 120<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b10\u00b020\u2032<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b10\u00b020\u2032<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b10\u00b030\u2032<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b11\u00b0<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">mais de 120 a 400<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b10\u00b010\u2032<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b10\u00b010\u2032<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b10\u00b015\u2032<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b10\u00b030\u2032<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">mais de 400<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b10\u00b05\u2032<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b10\u00b05\u2032<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b10\u00b010\u2032<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u00b10\u00b020\u2032<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><b>ISO 2768-2: Toler\u00e2ncias geom\u00e9tricas<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Esses par\u00e2metros determinam a forma e a posi\u00e7\u00e3o. Os valores s\u00e3o expressos em mil\u00edmetros. Observe que a norma ISO 2768-2 n\u00e3o abrange o paralelismo, a cilindricidade, a concentricidade, o perfil ou a posi\u00e7\u00e3o real, os quais exigem anota\u00e7\u00f5es expl\u00edcitas de GD&amp;T.<\/span><\/p>\n<p><b>Retilinearidade e planicidade<\/b><span style=\"font-weight: 400;\"> (por comprimento nominal)<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><span style=\"font-weight: 400;\">Faixa de comprimento nominal (mm)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">H<\/span><\/td>\n<td><span style=\"font-weight: 400;\">K<\/span><\/td>\n<td><span style=\"font-weight: 400;\">L<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">at\u00e9 10<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0.02<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0.05<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0.1<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">entre 10 e 30<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0.05<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0.1<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0.2<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">mais de 30 a 100<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0.1<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0.2<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0.4<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">mais de 100 a 300<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0.2<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0.4<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0.8<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">mais de 300 a 1.000<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0.3<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0.6<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1.2<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">entre 1.000 e 3.000<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0.4<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0.8<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1.6<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><b>Perpendicularidade<\/b><span style=\"font-weight: 400;\"> (pelo comprimento do lado mais curto)<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><span style=\"font-weight: 400;\">Intervalo do lado mais curto (mm)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">H<\/span><\/td>\n<td><span style=\"font-weight: 400;\">K<\/span><\/td>\n<td><span style=\"font-weight: 400;\">L<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">at\u00e9 100<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0.2<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0.4<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0.6<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">mais de 100 a 300<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0.3<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0.6<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1.0<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">mais de 300 a 1.000<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0.4<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0.8<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1.5<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">entre 1.000 e 3.000<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0.5<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1.0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">2.0<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><b>Simetria<\/b><\/p>\n<table>\n<tbody>\n<tr>\n<td><span style=\"font-weight: 400;\">Faixa de comprimento nominal (mm)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">H<\/span><\/td>\n<td><span style=\"font-weight: 400;\">K<\/span><\/td>\n<td><span style=\"font-weight: 400;\">L<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">at\u00e9 100<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0.5<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0.6<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0.6<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">mais de 100 a 300<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0.5<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0.6<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1.0<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">mais de 300 a 1.000<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0.5<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0.8<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1.5<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">entre 1.000 e 3.000<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0.5<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1.0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">2.0<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><b>Desvio circular<\/b><\/p>\n<table>\n<tbody>\n<tr>\n<td><span style=\"font-weight: 400;\">H<\/span><\/td>\n<td><span style=\"font-weight: 400;\">K<\/span><\/td>\n<td><span style=\"font-weight: 400;\">L<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">0.1<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0.2<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0.5<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><b>Como interpretar a norma ISO 2768-mK<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Uma refer\u00eancia combinada associa uma classe de cada parte. Na norma ISO 2768-mK, as letras min\u00fasculas <\/span><b>m<\/b><span style=\"font-weight: 400;\"> \u00e9 a fonte linear de tamanho m\u00e9dio da Parte 1, e a mai\u00fascula <\/span><b>K<\/b><span style=\"font-weight: 400;\"> \u00e9 a classe geom\u00e9trica m\u00e9dia da Parte 2. Assim, uma dimens\u00e3o de 25 mm sem toler\u00e2ncia em um desenho conforme a norma ISO 2768-mK tem uma toler\u00e2ncia de \u00b10,2 mm, pois 25 mm se enquadra no intervalo de 6 a 30 da coluna m\u00e9dia. Uma indica\u00e7\u00e3o de planicidade em uma face de 200 mm permitiria 0,4 mm na classe K.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">A ISO 2768-mK \u00e9 a toler\u00e2ncia geral mais comum em <a href=\"https:\/\/rapidcision.com\/pt\/cnc-machining\/\">Usinagem CNC<\/a> e desenhos de chapas met\u00e1licas, pois as classes m\u00e9dias correspondem \u00e0 capacidade de uma m\u00e1quina eficiente sem exigir esfor\u00e7o adicional.<\/span><\/p>\n<h2><b>Escolhendo a aula certa<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Escolha a classe mais flex\u00edvel que ainda permita o funcionamento da pe\u00e7a. Mais r\u00edgido n\u00e3o \u00e9 melhor, \u00e9 mais caro.<\/span><\/p>\n<ul>\n<li><span style=\"font-weight: 400;\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <\/span><b>Fino (f) e H<\/b><span style=\"font-weight: 400;\"> para elementos de precis\u00e3o, superf\u00edcies de encaixe e pe\u00e7as com ajustes apertados.<\/span><\/li>\n<li><span style=\"font-weight: 400;\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <\/span><b>M\u00e9dio (m) e K<\/b><span style=\"font-weight: 400;\"> para pe\u00e7as usinadas em geral e pe\u00e7as de chapa met\u00e1lica. Essa \u00e9 a configura\u00e7\u00e3o padr\u00e3o para a maioria dos trabalhos.<\/span><\/li>\n<li><span style=\"font-weight: 400;\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <\/span><b>Grossa (c) e L<\/b><span style=\"font-weight: 400;\"> para pe\u00e7as n\u00e3o essenciais, como tampas, suportes e caixas, nas quais o encaixe n\u00e3o \u00e9 exigente.<\/span><\/li>\n<li><span style=\"font-weight: 400;\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <\/span><b>Muito grosso (v)<\/b><span style=\"font-weight: 400;\"> para pe\u00e7as em bruto, pe\u00e7as cortadas \u00e0 chama e pe\u00e7as fundidas; raramente utilizado em trabalhos com CNC.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Especificar toler\u00e2ncias mais restritas do que o necess\u00e1rio aumenta o tempo e o custo de usinagem, enquanto especificar toler\u00e2ncias mais amplas do que o necess\u00e1rio para a pe\u00e7a causa falhas na montagem. A decis\u00e3o correta \u00e9 restringir apenas os elementos que realmente importam e deixar que a toler\u00e2ncia geral cuide do restante.<\/span><\/p>\n<h2><b>ISO 2768 vs. GD&amp;T expl\u00edcita<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">A norma ISO 2768 funciona como uma rede de seguran\u00e7a para as dimens\u00f5es \u00e0s quais n\u00e3o foram atribu\u00eddas toler\u00e2ncias individuais. Ela n\u00e3o substitui a GD&amp;T nos casos em que a fun\u00e7\u00e3o exige controle. Qualquer dimens\u00e3o com toler\u00e2ncia expl\u00edcita pr\u00f3pria substitui o padr\u00e3o geral, e as caracter\u00edsticas que exigem controle de posi\u00e7\u00e3o, cilindricidade, concentricidade ou perfil devem ser indicadas explicitamente, uma vez que a ISO 2768-2 n\u00e3o as abrange. O padr\u00e3o pr\u00e1tico em um bom desenho \u00e9 uma \u00fanica nota ISO 2768 no bloco de t\u00edtulo, com toler\u00e2ncias expl\u00edcitas e GD&amp;T aplicadas apenas \u00e0s caracter\u00edsticas cr\u00edticas.<\/span><\/p>\n<h2><b>Onde o Rapidcision se encaixa<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Quando voc\u00ea envia um desenho para obter um or\u00e7amento instant\u00e2neo, a classe ISO 2768 indicada no bloco de t\u00edtulo nos orienta sobre como tratar cada caracter\u00edstica sem toler\u00e2ncia, o que torna o pre\u00e7o e a produ\u00e7\u00e3o previs\u00edveis. Se sua pe\u00e7a tiver caracter\u00edsticas cr\u00edticas, indique-as explicitamente e deixe que a toler\u00e2ncia geral cubra o restante; nosso feedback de DFM sinalizar\u00e1 qualquer coisa que pare\u00e7a mais restrita do que o necess\u00e1rio. Verifique a capacidade em nosso<\/span><a href=\"https:\/\/rapidcision.com\/pt\/cnc-machining\/\"> <span style=\"font-weight: 400;\">Servi\u00e7os de usinagem CNC<\/span><\/a><span style=\"font-weight: 400;\">, veja como o acabamento se integra ao nosso<\/span><a href=\"https:\/\/rapidcision.com\/pt\/surface-roughness-chart\/\"> <span style=\"font-weight: 400;\">tabela de rugosidade de superf\u00edcie<\/span><\/a><span style=\"font-weight: 400;\">, ou<\/span><a href=\"https:\/\/rapidcision.com\/pt\/get-a-quote\/\"> <span style=\"font-weight: 400;\">Envie seu arquivo CAD para obter um or\u00e7amento<\/span><\/a><span style=\"font-weight: 400;\">.<\/span><\/p>\n<h2><b>Perguntas frequentes<\/b><\/h2>\n<p><b>O que \u00e9 a ISO 2768?<\/b><span style=\"font-weight: 400;\"> A ISO 2768 \u00e9 uma norma internacional que define toler\u00e2ncias gerais para dimens\u00f5es em um desenho que n\u00e3o possuem toler\u00e2ncia expl\u00edcita pr\u00f3pria. Uma \u00fanica nota no cartucho, como ISO 2768-mK, define a varia\u00e7\u00e3o admiss\u00edvel padr\u00e3o para todos os elementos sem toler\u00e2ncia.<\/span><\/p>\n<p><b>O que significa ISO 2768-mK?<\/b><span style=\"font-weight: 400;\"> Combina a classe linear m\u00e9dia (m) da norma ISO 2768-1 com a classe geom\u00e9trica m\u00e9dia (K) da norma ISO 2768-2. \u00c9 a indica\u00e7\u00e3o de toler\u00e2ncia geral mais comum para pe\u00e7as usinadas por CNC e pe\u00e7as de chapa met\u00e1lica.<\/span><\/p>\n<p><b>Qual \u00e9 a toler\u00e2ncia prevista pela norma ISO 2768 para uma dimens\u00e3o de 25 mm?<\/b><span style=\"font-weight: 400;\"> Na classe m\u00e9dia (m), uma dimens\u00e3o de 25 mm apresenta uma toler\u00e2ncia de \u00b10,2 mm, pois se enquadra na faixa de 6 a 30 mm. O desvio depende da faixa de tamanho em que a dimens\u00e3o se enquadra.<\/span><\/p>\n<p><b>Qual classe da norma ISO 2768 devo usar para pe\u00e7as CNC?<\/b><span style=\"font-weight: 400;\"> A toler\u00e2ncia m\u00e9dia (m) com toler\u00e2ncias geom\u00e9tricas K \u00e9 adequada para a maioria dos trabalhos em CNC, uma vez que corresponde ao que uma m\u00e1quina de boa capacidade pode suportar economicamente. Utilize a toler\u00e2ncia fina (f) e H para elementos de precis\u00e3o, e a toler\u00e2ncia grossa (c) ou L para pe\u00e7as n\u00e3o cr\u00edticas.<\/span><\/p>\n<p><b>A norma ISO 2768 abrange todas as toler\u00e2ncias geom\u00e9tricas?<\/b><span style=\"font-weight: 400;\"> A norma ISO 2768-2 abrange retid\u00e3o, planicidade, perpendicularidade, simetria e excentricidade circular. O paralelismo, a cilindricidade, a concentricidade, o perfil e a posi\u00e7\u00e3o real exigem anota\u00e7\u00f5es expl\u00edcitas de GD&amp;T.<\/span><\/p>\n<p><b>Uma toler\u00e2ncia explicitada prevalece sobre a norma ISO 2768?<\/b><span style=\"font-weight: 400;\"> Sim. Qualquer dimens\u00e3o com toler\u00e2ncia especificada tem preced\u00eancia sobre a toler\u00e2ncia padr\u00e3o geral da norma ISO 2768. A toler\u00e2ncia geral aplica-se apenas a elementos que n\u00e3o possuam uma indica\u00e7\u00e3o espec\u00edfica.<\/span><\/p>\n<h2><b>Como usar a tabela de toler\u00e2ncias<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">A norma ISO 2768 mant\u00e9m os desenhos claros e inequ\u00edvocos ao definir toler\u00e2ncias padr\u00e3o razo\u00e1veis com uma \u00fanica refer\u00eancia, na maioria das vezes a ISO 2768-mK. Verifique a faixa de tamanho da sua cota em rela\u00e7\u00e3o \u00e0 classe correta, ajuste apenas as caracter\u00edsticas que precisam e use GD&amp;T expl\u00edcito onde a fun\u00e7\u00e3o exigir. Essa abordagem mant\u00e9m a qualidade onde \u00e9 importante e reduz custos em todos os outros aspectos.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Se voc\u00ea precisa fabricar uma pe\u00e7a,<\/span><a href=\"https:\/\/rapidcision.com\/pt\/get-a-quote\/\"> <span style=\"font-weight: 400;\">Envie seu desenho para obter um or\u00e7amento imediato<\/span><\/a><span style=\"font-weight: 400;\">. Aplicaremos a sua classe ISO 2768 \u00e0s dimens\u00f5es gerais e confirmaremos as toler\u00e2ncias cr\u00edticas com o feedback do DFM.<\/span><\/p>","protected":false},"excerpt":{"rendered":"<p>Reviewed by the Rapidcision Engineering Team | Last updated: June 2026 A CNC machining tolerance chart tells you the permissible variation allowed on a dimension that does not carry its own explicit tolerance. On most engineering drawings, that default comes from ISO 2768, an international standard you invoke with a single note in the title [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":6955,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15,11],"tags":[],"class_list":["post-6954","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-cnc-machining"],"_links":{"self":[{"href":"https:\/\/rapidcision.com\/pt\/wp-json\/wp\/v2\/posts\/6954","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rapidcision.com\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/rapidcision.com\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/rapidcision.com\/pt\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/rapidcision.com\/pt\/wp-json\/wp\/v2\/comments?post=6954"}],"version-history":[{"count":2,"href":"https:\/\/rapidcision.com\/pt\/wp-json\/wp\/v2\/posts\/6954\/revisions"}],"predecessor-version":[{"id":7288,"href":"https:\/\/rapidcision.com\/pt\/wp-json\/wp\/v2\/posts\/6954\/revisions\/7288"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/rapidcision.com\/pt\/wp-json\/wp\/v2\/media\/6955"}],"wp:attachment":[{"href":"https:\/\/rapidcision.com\/pt\/wp-json\/wp\/v2\/media?parent=6954"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rapidcision.com\/pt\/wp-json\/wp\/v2\/categories?post=6954"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rapidcision.com\/pt\/wp-json\/wp\/v2\/tags?post=6954"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}