{"id":19,"date":"2026-06-16T09:00:00","date_gmt":"2026-06-16T07:00:00","guid":{"rendered":"https:\/\/www.matai.cz\/blog\/din-985-samojistne-matice\/"},"modified":"2026-06-26T14:58:03","modified_gmt":"2026-06-26T12:58:03","slug":"din-985-samojistne-matice","status":"publish","type":"post","link":"https:\/\/www.matai.cz\/blog\/din-985-samojistne-matice\/","title":{"rendered":"Samojistn\u00e9 matice DIN 985 vs DIN 934"},"content":{"rendered":"<p>Pokud spoj pracuje ve vibrac\u00edch, b\u011b\u017en\u00e1 \u0161estihrann\u00e1 matice se m\u016f\u017ee postupn\u011b povolit. \u0158e\u0161en\u00edm je <strong>samojistn\u00e1 matice DIN 985<\/strong> s polyamidovou (nylonovou) vlo\u017ekou. V tomto \u010dl\u00e1nku porovn\u00e1me DIN 985 s klasickou <a href=\"\/blog\/din-934-sestihranne-matice\/\">matic\u00ed DIN 934<\/a>, vysv\u011btl\u00edme teplotn\u00ed limity vlo\u017eky, ot\u00e1zku opakovan\u00e9ho pou\u017eit\u00ed a porad\u00edme, kdy s\u00e1hnout po kter\u00e9.<\/p>\n<h2>Jak funguje samojistn\u00e1 matice DIN 985<\/h2>\n<p>Matice DIN 985 m\u00e1 v horn\u00ed \u010d\u00e1sti zalisovan\u00fd nylonov\u00fd (polyamidov\u00fd, PA) prstenec o men\u0161\u00edm vnit\u0159n\u00edm pr\u016fm\u011bru, ne\u017e je z\u00e1vit. P\u0159i na\u0161roubov\u00e1n\u00ed si z\u00e1vit \u0161roubu s\u00e1m vytla\u010d\u00ed dr\u00e1\u017eku do plastu, kter\u00fd kolem n\u011bj pevn\u011b sev\u0159e. Vznik\u00e1 tak <strong>t\u0159ec\u00ed (prevailing) moment<\/strong> nez\u00e1visl\u00fd na utahovac\u00edm nap\u011bt\u00ed \u2014 matice klade odpor ot\u00e1\u010den\u00ed i bez zat\u00ed\u017een\u00ed spoje. To je z\u00e1sadn\u00ed rozd\u00edl proti DIN 934, kter\u00e1 dr\u017e\u00ed pouze t\u0159en\u00edm z p\u0159\u00edtlaku.<\/p>\n<p>Mezin\u00e1rodn\u00edm prot\u011bj\u0161kem DIN 985 je norma <strong>ISO 10511<\/strong> (n\u00edzk\u00e1 samojistn\u00e1 matice). Existuje i vy\u0161\u0161\u00ed varianta DIN 982 (ISO 7040) s del\u0161\u00ed vlo\u017ekou a v\u011bt\u0161\u00edm z\u00e1b\u011brem z\u00e1vitu \u2014 ta se pou\u017e\u00edv\u00e1 tam, kde je pot\u0159eba je\u0161t\u011b vy\u0161\u0161\u00ed a stabiln\u011bj\u0161\u00ed t\u0159ec\u00ed moment. DIN 985 je z t\u011bchto dvou ni\u017e\u0161\u00ed (ten\u010d\u00ed) a b\u011b\u017en\u011bj\u0161\u00ed. Princip je u obou stejn\u00fd: vlo\u017eka z polyamidu vytv\u00e1\u0159\u00ed odpor proti ot\u00e1\u010den\u00ed nez\u00e1visle na tom, zda je spoj zat\u00ed\u017een, nebo ne.<\/p>\n<p>Tento t\u0159ec\u00ed moment je kl\u00ed\u010dov\u00fd rozd\u00edl proti klasick\u00fdm pojistn\u00fdm prvk\u016fm. Pru\u017en\u00e1 podlo\u017eka nebo ozuben\u00e1 podlo\u017eka br\u00e1n\u00ed povolen\u00ed t\u00edm, \u017ee tla\u010d\u00ed proti dosedac\u00ed plo\u0161e, ale ztrat\u00ed \u00fa\u010dinek, jakmile spoj povol\u00ed. Nylonov\u00e1 vlo\u017eka DIN 985 naopak dr\u017e\u00ed matici i ve chv\u00edli, kdy by p\u0159\u00edtlak ve spoji do\u010dasn\u011b poklesl \u2014 proto je obl\u00edben\u00e1 v aplikac\u00edch s r\u00e1zy a st\u0159\u00eddav\u00fdm zat\u00ed\u017een\u00edm.<\/p>\n<h2>DIN 985 vs DIN 934 \u2014 p\u0159ehled<\/h2>\n<table>\n<thead>\n<tr>\n<th>Vlastnost<\/th>\n<th>DIN 934<\/th>\n<th>DIN 985<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Poji\u0161t\u011bn\u00ed proti povolen\u00ed<\/td>\n<td>\u017d\u00e1dn\u00e9 (jen t\u0159en\u00ed z p\u0159\u00edtlaku)<\/td>\n<td>Nylonov\u00e1 vlo\u017eka \u2014 t\u0159ec\u00ed moment<\/td>\n<\/tr>\n<tr>\n<td>Odolnost proti vibrac\u00edm<\/td>\n<td>N\u00edzk\u00e1<\/td>\n<td>Vysok\u00e1<\/td>\n<\/tr>\n<tr>\n<td>Teplotn\u00ed limit<\/td>\n<td>Dle materi\u00e1lu oceli\/nerezu<\/td>\n<td>Omezen vlo\u017ekou (~ -40 a\u017e +120 \u00b0C)<\/td>\n<\/tr>\n<tr>\n<td>Opakovan\u00e9 pou\u017eit\u00ed<\/td>\n<td>Bez omezen\u00ed<\/td>\n<td>Omezen\u00e9 (vlo\u017eka se opot\u0159eb\u00ed)<\/td>\n<\/tr>\n<tr>\n<td>Norma ISO<\/td>\n<td>ISO 4032<\/td>\n<td>ISO 10511<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Teplotn\u00ed limit nylonov\u00e9 vlo\u017eky<\/h2>\n<p>Polyamidov\u00e1 vlo\u017eka ur\u010duje provozn\u00ed teplotn\u00ed rozsah matice. Standardn\u00ed nylon (PA 6 \/ PA 6.6) si zachov\u00e1v\u00e1 pru\u017enost p\u0159ibli\u017en\u011b mezi <strong>-40 \u00b0C a +120 \u00b0C<\/strong>. Nad cca 120 \u00b0C plast m\u011bkne, t\u0159ec\u00ed moment kles\u00e1 a pojistn\u00e1 funkce sl\u00e1bne; p\u0159i trval\u00e9m vystaven\u00ed vy\u0161\u0161\u00edm teplot\u00e1m se vlo\u017eka trvale deformuje. Pro vy\u0161\u0161\u00ed teploty existuj\u00ed speci\u00e1ln\u00ed vysokoteplotn\u00ed varianty s odoln\u011bj\u0161\u00edmi polymery, b\u011b\u017en\u00e1 DIN 985 v\u0161ak do hork\u00fdch provoz\u016f (v\u00fdfuky, spalovac\u00ed prostory) nepat\u0159\u00ed.<\/p>\n<h2>Lze samojistnou matici pou\u017e\u00edt opakovan\u011b?<\/h2>\n<p>DIN 985 nen\u00ed striktn\u011b jednor\u00e1zov\u00e1, ale ani neomezen\u011b opakovan\u011b pou\u017eiteln\u00e1. Z\u00e1vit \u0161roubu plast deformuje, nikoli od\u0159ez\u00e1v\u00e1, tak\u017ee matici lze povolit a znovu dot\u00e1hnout n\u011bkolikr\u00e1t. S ka\u017ed\u00fdm pou\u017eit\u00edm v\u0161ak t\u0159ec\u00ed moment kles\u00e1. Praktick\u00e9 pravidlo: <strong>pokud lze matici na\u0161roubovat prsty bez znateln\u00e9ho odporu vlo\u017eky, je opot\u0159eben\u00e1 a je t\u0159eba ji vym\u011bnit<\/strong>. U bezpe\u010dnostn\u011b kritick\u00fdch spoj\u016f se doporu\u010duje v\u017edy nov\u00e1 matice.<\/p>\n<h2>Materi\u00e1ly: nerez A2\/A4 i ocel<\/h2>\n<p>Stejn\u011b jako DIN 934 se i DIN 985 dod\u00e1v\u00e1 v oceli (pozinkovan\u00e9) a v nerezu <strong>A2 (304)<\/strong> a <strong>A4 (316)<\/strong>. Volba materi\u00e1lu se \u0159\u00edd\u00ed prost\u0159ed\u00edm \u2014 A4 do chlorid\u016f a p\u0159\u00edmo\u0159\u00ed, A2 do b\u011b\u017en\u00fdch podm\u00ednek; srovn\u00e1n\u00ed viz <a href=\"\/blog\/nerez-a2-vs-a4\/\">Nerez A2 vs A4<\/a>. Pro vibruj\u00edc\u00ed nerezov\u00e9 spoje s\u00e1hn\u011bte po <a href=\"\/p\/matice-sestihranne-pojistne-nizke-s-pa-vlozkou-din-985-a2\/\">samojistn\u00fdch matic\u00edch DIN 985 A2\/A4<\/a>.<\/p>\n<p>Je dobr\u00e9 si uv\u011bdomit, \u017ee materi\u00e1l t\u011blesa matice (nerez A2\/A4 nebo ocel) ur\u010duje odolnost proti korozi a mechanickou pevnost, zat\u00edmco teplotn\u00ed strop spoje s pojistnou funkc\u00ed ur\u010duje plastov\u00e1 vlo\u017eka. Nerezov\u00e1 matice A4 sice snese mnohem vy\u0161\u0161\u00ed teploty z hlediska materi\u00e1lu, ale samojistn\u00e1 funkce p\u0159esto skon\u010d\u00ed kolem 120 \u00b0C, proto\u017ee sel\u017ee nylon. V hork\u00e9m prost\u0159ed\u00ed proto i u nerezov\u00e9 DIN 985 po\u010d\u00edtejte se ztr\u00e1tou pojistn\u00e9ho \u00fa\u010dinku a rad\u011bji volte jin\u00fd zp\u016fsob zaji\u0161t\u011bn\u00ed (nap\u0159. pojistn\u00fd dr\u00e1t, kontramatici nebo lepidlo na z\u00e1vity).<\/p>\n<p>P\u0159i mont\u00e1\u017ei nerezov\u00e9 DIN 985 plat\u00ed stejn\u00e9 upozorn\u011bn\u00ed na zad\u00edr\u00e1n\u00ed (galling) jako u b\u011b\u017en\u00fdch nerezov\u00fdch matic. Vlo\u017eka nav\u00edc zvy\u0161uje t\u0159ec\u00ed moment u\u017e od po\u010d\u00e1tku na\u0161roubov\u00e1n\u00ed, tak\u017ee nerezovou samojistnou matici utahujte pomalu a s mazivem, aby se z\u00e1vit nezakousl je\u0161t\u011b d\u0159\u00edve, ne\u017e matice dosedne.<\/p>\n<h2>Kdy DIN 985 a kdy DIN 934<\/h2>\n<ul>\n<li><strong>DIN 985<\/strong> \u2014 spoje vystaven\u00e9 vibrac\u00edm a r\u00e1z\u016fm (stroje, motory, podvozky, dopravn\u00edky), kde nesm\u00ed doj\u00edt k povolen\u00ed a teplota nep\u0159esahuje ~120 \u00b0C.<\/li>\n<li><strong>DIN 934<\/strong> \u2014 statick\u00e9 nebo demontovateln\u00e9 spoje, vysok\u00e9 teploty, p\u0159\u00edpadn\u011b tam, kde se po\u010d\u00edt\u00e1 s opakovanou mont\u00e1\u017e\u00ed. Poji\u0161t\u011bn\u00ed lze doplnit pru\u017enou podlo\u017ekou.<\/li>\n<\/ul>\n<p>Alternativn\u011b k samojistn\u00e9 matici lze povolen\u00ed br\u00e1nit i pru\u017enou podlo\u017ekou pod b\u011b\u017enou matic\u00ed \u2014 viz nab\u00eddka <a href=\"\/spojovaci-material\/podlozky\/\">pru\u017en\u00fdch podlo\u017eek<\/a>. Pomoc s celkov\u00fdm v\u00fdb\u011brem najdete v \u010dl\u00e1nku <a href=\"\/blog\/jak-vybrat-spojovaci-material\/\">Jak vybrat spojovac\u00ed materi\u00e1l<\/a>.<\/p>\n<h2>\u010cast\u00e9 dotazy<\/h2>\n<h3>Do jak\u00e9 teploty vydr\u017e\u00ed samojistn\u00e1 matice DIN 985?<\/h3>\n<p>Nylonov\u00e1 vlo\u017eka standardn\u00ed DIN 985 funguje zhruba v rozsahu -40 \u00b0C a\u017e +120 \u00b0C. Nad 120 \u00b0C plast m\u011bkne a pojistn\u00e1 funkce kles\u00e1; pro hork\u00e9 provozy je t\u0159eba zvolit vysokoteplotn\u00ed variantu nebo jin\u00fd typ poji\u0161t\u011bn\u00ed.<\/p>\n<h3>Lze samojistnou matici pou\u017e\u00edt v\u00edckr\u00e1t?<\/h3>\n<p>Ano, ale jen omezen\u011b. Vlo\u017eka se postupn\u011b opot\u0159ebov\u00e1v\u00e1. Jakmile jde matici na\u0161roubovat prsty bez znateln\u00e9ho odporu, je t\u0159eba ji vym\u011bnit. U bezpe\u010dnostn\u00edch spoj\u016f pou\u017e\u00edvejte v\u017edy novou matici.<\/p>\n<h3>Jak\u00fd je rozd\u00edl mezi DIN 985 a DIN 934?<\/h3>\n<p>DIN 934 je b\u011b\u017en\u00e1 matice bez poji\u0161t\u011bn\u00ed proti povolen\u00ed. DIN 985 m\u00e1 nylonovou vlo\u017eku vytv\u00e1\u0159ej\u00edc\u00ed t\u0159ec\u00ed moment, kter\u00fd br\u00e1n\u00ed samovoln\u00e9mu povolen\u00ed p\u0159i vibrac\u00edch.<\/p>\n<h3>Je DIN 985 dostupn\u00e1 v nerezu A4?<\/h3>\n<p>Ano, DIN 985 se vyr\u00e1b\u00ed v oceli i v nerezu A2 (304) a A4 (316). Pro prost\u0159ed\u00ed s chloridy a p\u0159\u00edmo\u0159\u00ed volte A4.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Samojistn\u00e1 matice DIN 985 s nylonovou PA vlo\u017ekou vs b\u011b\u017en\u00e1 DIN 934: teplotn\u00ed limit ~120 \u00b0C, opakovan\u00e9 pou\u017eit\u00ed, kdy pou\u017e\u00edt kterou a nerez A2\/A4.<\/p>\n","protected":false},"author":1,"featured_media":615,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_matai_meta_desc":"Samojistn\u00e1 matice DIN 985 s nylonovou PA vlo\u017ekou vs b\u011b\u017en\u00e1 DIN 934: teplotn\u00ed limit ~120 \u00b0C, opakovan\u00e9 pou\u017eit\u00ed, kdy pou\u017e\u00edt kterou a nerez A2\/A4.","_matai_faq":"[{\"q\": \"Do jak\u00e9 teploty vydr\u017e\u00ed samojistn\u00e1 matice DIN 985?\", \"a\": \"Nylonov\u00e1 vlo\u017eka standardn\u00ed DIN 985 funguje zhruba v rozsahu -40 \u00b0C a\u017e +120 \u00b0C. Nad 120 \u00b0C plast m\u011bkne a pojistn\u00e1 funkce kles\u00e1; pro hork\u00e9 provozy je t\u0159eba zvolit vysokoteplotn\u00ed variantu nebo jin\u00fd typ poji\u0161t\u011bn\u00ed.\"}, {\"q\": \"Lze samojistnou matici pou\u017e\u00edt v\u00edckr\u00e1t?\", \"a\": \"Ano, ale jen omezen\u011b. Vlo\u017eka se postupn\u011b opot\u0159ebov\u00e1v\u00e1. Jakmile jde matici na\u0161roubovat prsty bez znateln\u00e9ho odporu, je t\u0159eba ji vym\u011bnit. U bezpe\u010dnostn\u00edch spoj\u016f pou\u017e\u00edvejte v\u017edy novou matici.\"}, {\"q\": \"Jak\u00fd je rozd\u00edl mezi DIN 985 a DIN 934?\", \"a\": \"DIN 934 je b\u011b\u017en\u00e1 matice bez poji\u0161t\u011bn\u00ed proti povolen\u00ed. DIN 985 m\u00e1 nylonovou vlo\u017eku vytv\u00e1\u0159ej\u00edc\u00ed t\u0159ec\u00ed moment, kter\u00fd br\u00e1n\u00ed samovoln\u00e9mu povolen\u00ed p\u0159i vibrac\u00edch.\"}, {\"q\": \"Je DIN 985 dostupn\u00e1 v nerezu A4?\", \"a\": \"Ano, DIN 985 se vyr\u00e1b\u00ed v oceli i v nerezu A2 (304) a A4 (316). Pro prost\u0159ed\u00ed s chloridy a p\u0159\u00edmo\u0159\u00ed volte A4.\"}]","_matai_schema_type":"TechArticle","footnotes":""},"categories":[2],"tags":[],"class_list":["post-19","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\/19","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=19"}],"version-history":[{"count":3,"href":"https:\/\/www.matai.cz\/blog\/wp-json\/wp\/v2\/posts\/19\/revisions"}],"predecessor-version":[{"id":397,"href":"https:\/\/www.matai.cz\/blog\/wp-json\/wp\/v2\/posts\/19\/revisions\/397"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.matai.cz\/blog\/wp-json\/wp\/v2\/media\/615"}],"wp:attachment":[{"href":"https:\/\/www.matai.cz\/blog\/wp-json\/wp\/v2\/media?parent=19"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.matai.cz\/blog\/wp-json\/wp\/v2\/categories?post=19"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.matai.cz\/blog\/wp-json\/wp\/v2\/tags?post=19"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}