{"id":20,"date":"2026-06-23T09:00:00","date_gmt":"2026-06-23T07:00:00","guid":{"rendered":"https:\/\/www.matai.cz\/blog\/podlozky-din-125-9021-433\/"},"modified":"2026-06-26T14:58:26","modified_gmt":"2026-06-26T12:58:26","slug":"podlozky-din-125-9021-433","status":"publish","type":"post","link":"https:\/\/www.matai.cz\/blog\/podlozky-din-125-9021-433\/","title":{"rendered":"Ploch\u00e9 podlo\u017eky DIN 125, 9021 a 433 \u2014 rozd\u00edly a v\u00fdb\u011br"},"content":{"rendered":"<p>Ploch\u00e1 podlo\u017eka rozkl\u00e1d\u00e1 p\u0159\u00edtlak matice nebo hlavy \u0161roubu na v\u011bt\u0161\u00ed plochu, chr\u00e1n\u00ed povrch a zabra\u0148uje protla\u010den\u00ed do m\u011bkk\u00e9ho materi\u00e1lu. T\u0159i nejb\u011b\u017en\u011bj\u0161\u00ed normy \u2014 <strong>DIN 125, DIN 9021 a DIN 433<\/strong> \u2014 se li\u0161\u00ed hlavn\u011b vn\u011bj\u0161\u00edm pr\u016fm\u011brem, a t\u00edm i nosnou plochou. V tomto \u010dl\u00e1nku si vysv\u011btl\u00edme rozd\u00edly a porad\u00edme, kdy kter\u00e1 podlo\u017eka pat\u0159\u00ed pod spoj.<\/p>\n<h2>T\u0159i normy, t\u0159i velikosti vn\u011bj\u0161\u00edho pr\u016fm\u011bru<\/h2>\n<ul>\n<li><strong>DIN 125<\/strong> \u2014 standardn\u00ed ploch\u00e1 podlo\u017eka. Univerz\u00e1ln\u00ed volba pro b\u011b\u017en\u00e9 \u0161roubov\u00e9 spoje. ISO ekvivalent ISO 7089\/7090.<\/li>\n<li><strong>DIN 9021<\/strong> \u2014 podlo\u017eka s velk\u00fdm vn\u011bj\u0161\u00edm pr\u016fm\u011brem (cca 3\u00d7 pr\u016fm\u011br otvoru), tzv. \u201ekaroseriov\u00e1&#8220; \/ fender. Rozkl\u00e1d\u00e1 tlak na velkou plochu. ISO ekvivalent ISO 7093.<\/li>\n<li><strong>DIN 433<\/strong> \u2014 podlo\u017eka s mal\u00fdm (\u00fazk\u00fdm) vn\u011bj\u0161\u00edm pr\u016fm\u011brem, tzv. mal\u00e1 s\u00e9rie. ISO ekvivalent ISO 7092.<\/li>\n<\/ul>\n<p>Pro libovoln\u00fd rozm\u011br \u0161roubu tedy plat\u00ed po\u0159ad\u00ed podle vn\u011bj\u0161\u00edho pr\u016fm\u011bru: <strong>DIN 433 (nejmen\u0161\u00ed) &lt; DIN 125 (standard) &lt; DIN 9021 (nejv\u011bt\u0161\u00ed)<\/strong>.<\/p>\n<h2>Rozm\u011brov\u00e1 tabulka \u2014 vn\u011bj\u0161\u00ed pr\u016fm\u011br (ov\u011b\u0159en\u00e9 hodnoty)<\/h2>\n<p>Porovn\u00e1n\u00ed jmenovit\u00e9ho vn\u011bj\u0161\u00edho pr\u016fm\u011bru v mm pro t\u0159i b\u011b\u017en\u00e9 velikosti:<\/p>\n<table>\n<thead>\n<tr>\n<th>Z\u00e1vit<\/th>\n<th>DIN 433 (mal\u00e1) \u2014 vn\u011bj\u0161\u00ed \u00d8<\/th>\n<th>DIN 125 (standard) \u2014 vn\u011bj\u0161\u00ed \u00d8<\/th>\n<th>DIN 9021 (velk\u00e1) \u2014 vn\u011bj\u0161\u00ed \u00d8<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>M8<\/td>\n<td>15 mm<\/td>\n<td>17 mm<\/td>\n<td>24 mm<\/td>\n<\/tr>\n<tr>\n<td>M10<\/td>\n<td>18 mm<\/td>\n<td>21 mm<\/td>\n<td>30 mm<\/td>\n<\/tr>\n<tr>\n<td>M12<\/td>\n<td>20 mm<\/td>\n<td>24 mm<\/td>\n<td>37 mm<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Z tabulky je dob\u0159e vid\u011bt logika v\u00fdb\u011bru: \u010d\u00edm v\u011bt\u0161\u00ed vn\u011bj\u0161\u00ed pr\u016fm\u011br, t\u00edm v\u011bt\u0161\u00ed nosn\u00e1 plocha a t\u00edm ni\u017e\u0161\u00ed m\u011brn\u00fd tlak na podklad. U DIN 9021 je vn\u011bj\u0161\u00ed pr\u016fm\u011br p\u0159ibli\u017en\u011b trojn\u00e1sobkem pr\u016fm\u011bru otvoru, proto se j\u00ed p\u0159ezd\u00edv\u00e1 karoseriov\u00e1 podlo\u017eka. DIN 433 jde opa\u010dn\u00fdm sm\u011brem \u2014 vn\u011bj\u0161\u00ed pr\u016fm\u011br je jen m\u00edrn\u011b v\u011bt\u0161\u00ed ne\u017e hlava \u0161roubu nebo matice, tak\u017ee podlo\u017eka t\u00e9m\u011b\u0159 nep\u0159esahuje a hod\u00ed se do st\u00edsn\u011bn\u00fdch m\u00edst. Vnit\u0159n\u00ed pr\u016fm\u011br (otvor) je u v\u0161ech t\u0159\u00ed norem prakticky stejn\u00fd a odpov\u00edd\u00e1 dan\u00e9mu z\u00e1vitu s drobnou v\u016fl\u00ed.<\/p>\n<p>Vedle vn\u011bj\u0161\u00edho pr\u016fm\u011bru se normy li\u0161\u00ed i tlou\u0161\u0165kou plechu, z n\u011bho\u017e jsou vyrobeny, a t\u00edm i tuhost\u00ed. Siln\u011bj\u0161\u00ed podlo\u017eka se m\u00e9n\u011b prohne a l\u00e9pe rozkl\u00e1d\u00e1 tlak; ten\u010d\u00ed podlo\u017eka se p\u0159izp\u016fsob\u00ed drobn\u00fdm nerovnostem. Pro b\u011b\u017en\u00e9 spoje nen\u00ed rozd\u00edl podstatn\u00fd, u nam\u00e1han\u00fdch nebo poddajn\u00fdch podklad\u016f ale tuhost podlo\u017eky hraje roli.<\/p>\n<h2>\u00danosnost a rozlo\u017een\u00ed tlaku<\/h2>\n<p>\u00danosnost spoje neur\u010duje samotn\u00e1 podlo\u017eka, ale podlo\u017eka z\u00e1sadn\u011b ovliv\u0148uje, jak se p\u0159\u00edtlak rozlo\u017e\u00ed na podkladov\u00fd materi\u00e1l:<\/p>\n<ul>\n<li><strong>DIN 9021<\/strong> m\u00e1 nejv\u011bt\u0161\u00ed nosnou plochu \u2014 ide\u00e1ln\u00ed do <em>m\u011bkk\u00fdch a poddajn\u00fdch materi\u00e1l\u016f<\/em> (d\u0159evo, plast, tenk\u00fd nebo d\u011brovan\u00fd plech, s\u00e1drokarton), kde by standardn\u00ed podlo\u017eka materi\u00e1l protla\u010dila.<\/li>\n<li><strong>DIN 125<\/strong> je univerz\u00e1ln\u00ed kompromis pro b\u011b\u017en\u00e9 kovov\u00e9 a tvrd\u0161\u00ed konstrukce.<\/li>\n<li><strong>DIN 433<\/strong> \u0161et\u0159\u00ed m\u00edsto tam, kde je <em>m\u00e1lo prostoru kolem otvoru<\/em> (\u00fazk\u00e9 p\u0159\u00edruby, profily, bl\u00edzko hran), nebo kde nechcete velk\u00fd p\u0159esah podlo\u017eky.<\/li>\n<\/ul>\n<p>Praktick\u00e9 pravidlo: pokud se p\u0159\u00edtlak matice op\u00edr\u00e1 o tvrd\u00fd kov (ocelov\u00e1 konstrukce, p\u0159\u00edruba), je standardn\u00ed DIN 125 dostate\u010dn\u00e1. Jakmile pod podlo\u017ekou c\u00edt\u00edte \u201em\u011bkk\u00fd&#8220; materi\u00e1l nebo velk\u00fd \u010di podlouhl\u00fd otvor, s\u00e1hn\u011bte po DIN 9021, aby se zat\u00ed\u017een\u00ed rozneslo a hlava \u0161roubu nebo matice se nepropadla. DIN 433 \u0159e\u0161te jako specialitu pro \u00fazk\u00e1 m\u00edsta \u2014 nikoli jako \u00fasporu materi\u00e1lu, proto\u017ee men\u0161\u00ed plocha znamen\u00e1 vy\u0161\u0161\u00ed m\u011brn\u00fd tlak a t\u00edm v\u011bt\u0161\u00ed riziko otla\u010den\u00ed podkladu.<\/p>\n<h2>Materi\u00e1ly: nerez A2\/A4 i ocel<\/h2>\n<p>V\u0161echny t\u0159i normy se vyr\u00e1b\u011bj\u00ed v oceli (\u010dasto pozinkovan\u00e9) i v nerezu <strong>A2 (304)<\/strong> a <strong>A4 (316)<\/strong>. Materi\u00e1l podlo\u017eky by m\u011bl odpov\u00eddat materi\u00e1lu spoje \u2014 k nerezov\u00e9mu \u0161roubu a matici A4 pat\u0159\u00ed i nerezov\u00e1 podlo\u017eka A4, aby nedo\u0161lo ke kontaktn\u00ed korozi. Rozd\u00edl mezi nerezy rozeb\u00edr\u00e1me v \u010dl\u00e1nku <a href=\"\/blog\/nerez-a2-vs-a4\/\">Nerez A2 vs A4<\/a>. Standardn\u00ed podlo\u017eky najdete v kategorii <a href=\"\/p\/podlozky-ploche-din-125a-a2\/\">ploch\u00fdch podlo\u017eek DIN 125<\/a>.<\/p>\n<h2>Ploch\u00e9 vs pru\u017en\u00e9 podlo\u017eky<\/h2>\n<p>Ploch\u00e9 podlo\u017eky (125\/9021\/433) <strong>nepoji\u0161\u0165uj\u00ed<\/strong> spoj proti povolen\u00ed \u2014 pouze rozkl\u00e1daj\u00ed tlak. Pokud pot\u0159ebujete br\u00e1nit povolen\u00ed p\u0159i vibrac\u00edch, kombinujte je s <a href=\"\/spojovaci-material\/podlozky\/\">pru\u017enou podlo\u017ekou<\/a>, p\u0159\u00edpadn\u011b pou\u017eijte <a href=\"\/blog\/din-985-samojistne-matice\/\">samojistnou matici DIN 985<\/a>. Pod b\u011b\u017enou <a href=\"\/blog\/din-934-sestihranne-matice\/\">matici DIN 934<\/a> pat\u0159\u00ed ploch\u00e1 podlo\u017eka prakticky v\u017edy.<\/p>\n<h2>Jak vybrat spr\u00e1vnou podlo\u017eku<\/h2>\n<ol>\n<li>Zm\u011b\u0159te pr\u016fm\u011br \u0161roubu (M8, M10, M12\u2026) a podle n\u011bj zvolte rozm\u011br podlo\u017eky.<\/li>\n<li>Posu\u010fte podklad \u2014 m\u011bkk\u00fd materi\u00e1l nebo velk\u00fd otvor = DIN 9021; b\u011b\u017en\u00fd kov = DIN 125; m\u00e1lo m\u00edsta = DIN 433.<\/li>\n<li>Slad\u011bte materi\u00e1l s ostatn\u00edmi d\u00edly spoje (nerez A2\/A4 vs ocel).<\/li>\n<\/ol>\n<p>Komplexn\u00ed postup v\u00fdb\u011bru spojovac\u00edho materi\u00e1lu najdete v \u010dl\u00e1nku <a href=\"\/blog\/jak-vybrat-spojovaci-material\/\">Jak vybrat spojovac\u00ed materi\u00e1l<\/a> a p\u0159ehled norem v <a href=\"\/blog\/normy-a-materialy\/\">Normy a materi\u00e1ly<\/a>.<\/p>\n<h2>ISO ekvivalenty a zam\u011bnitelnost<\/h2>\n<p>Pro ka\u017edou z t\u011bchto DIN norem existuje mezin\u00e1rodn\u00ed prot\u011bj\u0161ek ISO: DIN 125 odpov\u00edd\u00e1 ISO 7089\/7090, DIN 9021 odpov\u00edd\u00e1 ISO 7093 a DIN 433 odpov\u00edd\u00e1 ISO 7092. Mezi DIN 433 a ISO 7092 nejsou \u017e\u00e1dn\u00e9 rozm\u011brov\u00e9 rozd\u00edly \u2014 li\u0161\u00ed se zpravidla jen tvrdost\u00ed materi\u00e1lu (ISO 7092 b\u00fdv\u00e1 dostupn\u00e1 i ve tvrd\u0161\u00edch proveden\u00edch). V praxi tak m\u016f\u017eete podlo\u017eky DIN a jejich ISO ekvivalenty zam\u011b\u0148ovat, pokud sed\u00ed jmenovit\u00fd rozm\u011br i materi\u00e1l.<\/p>\n<p>P\u0159i objedn\u00e1v\u00e1n\u00ed proto sta\u010d\u00ed zn\u00e1t t\u0159i \u00fadaje: rozm\u011br (z\u00e1vit \u0161roubu), normu podle po\u017eadovan\u00e9ho vn\u011bj\u0161\u00edho pr\u016fm\u011bru (433 \/ 125 \/ 9021) a materi\u00e1l (ocel pozinkovan\u00e1, nerez A2 nebo A4). Tato trojice jednozna\u010dn\u011b ur\u010d\u00ed spr\u00e1vnou podlo\u017eku pro dan\u00fd spoj.<\/p>\n<h2>\u010cast\u00e9 dotazy<\/h2>\n<h3>Jak\u00fd je rozd\u00edl mezi DIN 125, DIN 9021 a DIN 433?<\/h3>\n<p>Li\u0161\u00ed se vn\u011bj\u0161\u00edm pr\u016fm\u011brem. DIN 433 je mal\u00e1 (\u00fazk\u00e1) podlo\u017eka, DIN 125 standardn\u00ed a DIN 9021 velk\u00e1 (vn\u011bj\u0161\u00ed pr\u016fm\u011br cca 3\u00d7 otvor). Pro stejn\u00fd \u0161roub plat\u00ed: DIN 433 < DIN 125 < DIN 9021.<\/p>\n<h3>Kdy pou\u017e\u00edt velkou podlo\u017eku DIN 9021?<\/h3>\n<p>Do m\u011bkk\u00fdch a poddajn\u00fdch materi\u00e1l\u016f \u2014 d\u0159evo, plast, tenk\u00fd \u010di d\u011brovan\u00fd plech \u2014 kde velk\u00e1 nosn\u00e1 plocha br\u00e1n\u00ed protla\u010den\u00ed podlo\u017eky do podkladu.<\/p>\n<h3>Poji\u0161\u0165uje ploch\u00e1 podlo\u017eka spoj proti povolen\u00ed?<\/h3>\n<p>Ne. Ploch\u00e9 podlo\u017eky DIN 125, 9021 i 433 pouze rozkl\u00e1daj\u00ed tlak. Proti povolen\u00ed pou\u017eijte pru\u017enou podlo\u017eku nebo samojistnou matici DIN 985.<\/p>\n<h3>Jak\u00fd vn\u011bj\u0161\u00ed pr\u016fm\u011br m\u00e1 podlo\u017eka M10 DIN 125?<\/h3>\n<p>Standardn\u00ed podlo\u017eka DIN 125 pro M10 m\u00e1 vn\u011bj\u0161\u00ed pr\u016fm\u011br 21 mm. Pro srovn\u00e1n\u00ed DIN 433 m\u00e1 18 mm a velk\u00e1 DIN 9021 m\u00e1 30 mm.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ploch\u00e9 podlo\u017eky DIN 125, DIN 9021 a DIN 433: rozd\u00edly ve vn\u011bj\u0161\u00edm pr\u016fm\u011bru, \u00fanosnosti a kdy pou\u017e\u00edt kterou. Rozm\u011brov\u00e1 tabulka a materi\u00e1ly nerez A2\/A4.<\/p>\n","protected":false},"author":1,"featured_media":616,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_matai_meta_desc":"Ploch\u00e9 podlo\u017eky DIN 125, DIN 9021 a DIN 433: rozd\u00edly ve vn\u011bj\u0161\u00edm pr\u016fm\u011bru, \u00fanosnosti a kdy pou\u017e\u00edt kterou. Rozm\u011brov\u00e1 tabulka a materi\u00e1ly nerez A2\/A4.","_matai_faq":"[{\"q\": \"Jak\u00fd je rozd\u00edl mezi DIN 125, DIN 9021 a DIN 433?\", \"a\": \"Li\u0161\u00ed se vn\u011bj\u0161\u00edm pr\u016fm\u011brem. DIN 433 je mal\u00e1 (\u00fazk\u00e1) podlo\u017eka, DIN 125 standardn\u00ed a DIN 9021 velk\u00e1 (vn\u011bj\u0161\u00ed pr\u016fm\u011br cca 3\u00d7 otvor). Pro stejn\u00fd \u0161roub plat\u00ed: DIN 433 < DIN 125 < DIN 9021.\"}, {\"q\": \"Kdy pou\u017e\u00edt velkou podlo\u017eku DIN 9021?\", \"a\": \"Do m\u011bkk\u00fdch a poddajn\u00fdch materi\u00e1l\u016f \u2014 d\u0159evo, plast, tenk\u00fd \u010di d\u011brovan\u00fd plech \u2014 kde velk\u00e1 nosn\u00e1 plocha br\u00e1n\u00ed protla\u010den\u00ed podlo\u017eky do podkladu.\"}, {\"q\": \"Poji\u0161\u0165uje ploch\u00e1 podlo\u017eka spoj proti povolen\u00ed?\", \"a\": \"Ne. Ploch\u00e9 podlo\u017eky DIN 125, 9021 i 433 pouze rozkl\u00e1daj\u00ed tlak. Proti povolen\u00ed pou\u017eijte pru\u017enou podlo\u017eku nebo samojistnou matici DIN 985.\"}, {\"q\": \"Jak\u00fd vn\u011bj\u0161\u00ed pr\u016fm\u011br m\u00e1 podlo\u017eka M10 DIN 125?\", \"a\": \"Standardn\u00ed podlo\u017eka DIN 125 pro M10 m\u00e1 vn\u011bj\u0161\u00ed pr\u016fm\u011br 21 mm. Pro srovn\u00e1n\u00ed DIN 433 m\u00e1 18 mm a velk\u00e1 DIN 9021 m\u00e1 30 mm.\"}]","_matai_schema_type":"TechArticle","footnotes":""},"categories":[2],"tags":[],"class_list":["post-20","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-normy-a-materialy"],"_links":{"self":[{"href":"https:\/\/www.matai.cz\/blog\/wp-json\/wp\/v2\/posts\/20","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.matai.cz\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.matai.cz\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.matai.cz\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.matai.cz\/blog\/wp-json\/wp\/v2\/comments?post=20"}],"version-history":[{"count":4,"href":"https:\/\/www.matai.cz\/blog\/wp-json\/wp\/v2\/posts\/20\/revisions"}],"predecessor-version":[{"id":402,"href":"https:\/\/www.matai.cz\/blog\/wp-json\/wp\/v2\/posts\/20\/revisions\/402"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.matai.cz\/blog\/wp-json\/wp\/v2\/media\/616"}],"wp:attachment":[{"href":"https:\/\/www.matai.cz\/blog\/wp-json\/wp\/v2\/media?parent=20"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.matai.cz\/blog\/wp-json\/wp\/v2\/categories?post=20"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.matai.cz\/blog\/wp-json\/wp\/v2\/tags?post=20"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}