{"id":5577,"date":"2026-08-29T22:34:21","date_gmt":"2026-08-29T19:34:21","guid":{"rendered":"https:\/\/nanoplast.com.ua\/ru\/jak-viznachiti-bolti-iz-shestigrannoju-golovkoju-klasu-sae-2-5-ta-8"},"modified":"2026-08-29T22:34:21","modified_gmt":"2026-08-29T19:34:21","slug":"jak-viznachiti-bolti-iz-shestigrannoju-golovkoju-klasu-sae-2-5-ta-8","status":"publish","type":"post","link":"https:\/\/nanoplast.com.ua\/cs\/ru\/jak-identifikovat-sestihranne-srouby-sae-tridy-2-5-a-8","title":{"rendered":"Jak identifikovat \u0161estihrann\u00e9 \u0161rouby SAE t\u0159\u00eddy 2, 5 a 8"},"content":{"rendered":"

Stoj\u00edte v uli\u010dce obchodu se stavebninami. Nebo se mo\u017en\u00e1 d\u00edv\u00e1te na hromadu n\u00e1hodn\u00e9ho hardwaru ve va\u0161\u00ed gar\u00e1\u017ei. Mus\u00edte spojit dva ocelov\u00e9 prvky. Vezmi si \u0161estihrann\u00fd \u0161roub. Ale kter\u00fd p\u0159esn\u011b? <\/p>\n

Rozd\u00edl mezi levn\u00fdm \u0161roubem a struktur\u00e1ln\u00edm \u0161roubem nen\u00ed jen cena. Tohle je s\u00edla. Toto je chemick\u00e9 slo\u017een\u00ed. Jsou to \u010d\u00e1ry vyra\u017een\u00e9 na hlav\u011b. <\/p>\n

\u0160estihrann\u00e9 \u0161rouby p\u0159ich\u00e1zej\u00ed v ohromuj\u00edc\u00ed \u0159ad\u011b velikost\u00ed. Ocelov\u00e9 verze maj\u00ed pr\u016fm\u011br od 1\/4″ do 1 1\/2″. D\u00e9lka se m\u016f\u017ee pohybovat od 3\/8″ do 24″. Ale je tu fyzick\u00e9 omezen\u00ed. Velmi kr\u00e1tk\u00e9 \u0161rouby nejsou k dispozici ve velk\u00fdch pr\u016fm\u011brech. Extra dlouh\u00e9 \u0161rouby nejsou k dispozici v tenk\u00fdch velikostech. Fyzika zasahuje. <\/p>\n

Spole\u010dnost Automotive Engineers (SAE) stanovuje standardy. Ur\u010duj\u00ed pevnostn\u00ed t\u0159\u00eddy. Konkr\u00e9tn\u011b definuj\u00ed t\u0159\u00eddy 2, 5 a 8.<\/p>\n

Je tam \u0161roub t\u0159\u00eddy 9. M\u016f\u017eete na to narazit. P\u0159edpokl\u00e1d\u00e1 se, \u017ee je o 20 % pevn\u011bj\u0161\u00ed ne\u017e \u0161roub t\u0159\u00eddy 8. Nejedn\u00e1 se v\u0161ak o ofici\u00e1ln\u00ed stupe\u0148 SAE. Nem\u00e1 standardn\u00ed chemick\u00e9 a fyzik\u00e1ln\u00ed vlastnosti. Dr\u017ete se ofici\u00e1ln\u00edch t\u0159\u00ed t\u0159\u00edd, pokud nem\u00e1te konkr\u00e9tn\u00ed d\u016fvod ud\u011blat jinak. <\/p>\n

\u010cten\u00ed znak\u016f na hlav\u011b<\/h3>\n

Jak je od sebe odli\u0161it bez laboratorn\u00edho rozboru? D\u00edv\u00e1\u0161 se na hlavu. <\/p>\n

Ka\u017ed\u00fd \u0161roub nese symbol v\u00fdrobce. Toto je z\u00e1kladn\u00ed zna\u010dka. Ale \u0159\u00e1dky vypr\u00e1v\u011bj\u00ed p\u0159\u00edb\u011bh o s\u00edle. <\/p>\n

T\u0159\u00edda 2<\/strong> je z\u00e1kladn\u00ed \u00farove\u0148. Nem\u00e1 \u017e\u00e1dn\u00e9 jin\u00e9 ozna\u010den\u00ed. Pouze logo. Pokud ze st\u0159edu nevych\u00e1zej\u00ed \u017e\u00e1dn\u00e9 \u010d\u00e1ry, jedn\u00e1 se o \u0161roub t\u0159\u00eddy 2.<\/p>\n

T\u0159\u00edda 5<\/strong> m\u00e1 t\u0159i stejn\u011b vzd\u00e1len\u00e9 \u0159\u00e1dky. Vych\u00e1zej\u00ed ze st\u0159edu jako logo Mercedesu nebo vidlice. T\u0159i \u010d\u00e1ry ozna\u010duj\u00ed st\u0159edn\u011b uhl\u00edkovou ocel. Je siln\u011bj\u0161\u00ed ne\u017e t\u0159\u00edda 2. Je slab\u0161\u00ed ne\u017e t\u0159\u00edda 8.<\/p>\n

T\u0159\u00edda 8<\/strong> m\u00e1 \u0161est stejn\u011b rozm\u00edst\u011bn\u00fdch \u0159\u00e1dk\u016f. V\u00edce \u010dar – v\u00edce s\u00edly. Jsou vyrobeny ze st\u0159edn\u011b uhl\u00edkov\u00e9 legovan\u00e9 oceli. Jedn\u00e1 se o tahouny t\u011b\u017ek\u00e9ho stroj\u00edrenstv\u00ed a automobilov\u00e9ho pr\u016fmyslu. <\/p>\n

\n

Vizu\u00e1ln\u00ed vod\u00edtko je jednoduch\u00e9: \u017e\u00e1dn\u00e9 \u0159\u00e1dky znamenaj\u00ed t\u0159\u00eddu 2. T\u0159i \u0159\u00e1dky znamenaj\u00ed t\u0159\u00eddu 5. \u0160est \u0159\u00e1dk\u016f znamen\u00e1 t\u0159\u00eddu 8.<\/p>\n<\/blockquote>\n

\u010c\u00edsla za ocel\u00ed<\/h3>\n

Pevnost se m\u011b\u0159\u00ed pevnost\u00ed v tahu. Toto je tlak na \u010dtvere\u010dn\u00ed palec, kter\u00fd \u0161roub vydr\u017e\u00ed, ne\u017e se zlom\u00ed. <\/p>\n

T\u0159\u00edda 2<\/strong> odol\u00e1v\u00e1 60 000 a\u017e 74 000 psi. To sta\u010d\u00ed pro lehkou z\u00e1t\u011b\u017e. N\u00e1bytek. Vnit\u0159n\u00ed dekorace. N\u011bco, co nen\u00ed vystaveno siln\u00fdm ot\u0159es\u016fm nebo vibrac\u00edm. <\/p>\n

T\u0159\u00edda 5<\/strong> toto zvy\u0161uje na 105 000\u2013120 000 psi. Tady jsou v\u011bci v\u00e1\u017en\u00e9. R\u00e1my aut. Z\u00e1v\u011bsn\u00e9 komponenty. Konstruk\u010dn\u00ed \u0161rouby. <\/p>\n

T\u0159\u00edda 8<\/strong> odol\u00e1v\u00e1 tlaku 150 000 psi. M\u00e1 vysokou pevnost v tahu. T\u011b\u017ek\u00e1 technika. Pr\u016fmyslov\u00e9 stroje. Pokud stav\u00edte n\u011bco, co si pot\u0159ebuje zachovat integritu p\u0159i extr\u00e9mn\u00edm zat\u00ed\u017een\u00ed, je to v\u00e1\u0161 \u0161roub. <\/p>\n

D\u016fle\u017eit\u00e1 je tak\u00e9 tvrdost. M\u011b\u0159\u00edme to podle Rockwella C.<\/p>\n

Tvrdost j\u00e1dra \u0161roubu t\u0159\u00eddy 5 se pohybuje od C19 do C30. Tvrdost t\u0159\u00eddy 8 se pohybuje od C3<\/p>\n","protected":false},"excerpt":{"rendered":"

Stoj\u00edte v uli\u010dce obchodu se stavebninami. Nebo se mo\u017en\u00e1 d\u00edv\u00e1te na hromadu n\u00e1hodn\u00e9ho hardwaru ve va\u0161\u00ed gar\u00e1\u017ei. Mus\u00edte spojit dva ocelov\u00e9 prvky. Vezmi si \u0161estihrann\u00fd \u0161roub. Ale kter\u00fd p\u0159esn\u011b? Rozd\u00edl mezi levn\u00fdm \u0161roubem a struktur\u00e1ln\u00edm \u0161roubem nen\u00ed jen cena. Tohle je s\u00edla. Toto je chemick\u00e9 slo\u017een\u00ed. Jsou to \u010d\u00e1ry vyra\u017een\u00e9 na hlav\u011b. \u0160estihrann\u00e9 \u0161rouby p\u0159ich\u00e1zej\u00ed […]<\/p>\n","protected":false},"author":1,"featured_media":5576,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"tdm_status":"","tdm_grid_status":""},"categories":[86],"tags":[],"wpm_language_slugs":{"cs":"jak-identifikovat-sestihranne-srouby-sae-tridy-2-5-a-8","de":"so-identifizieren-sie-sechskantschrauben-der-sae-klassen-2-5-und-8","en":"how-to-identify-sae-grade-2-5-and-8-hex-head-cap-screws","es":"como-identificar-tornillos-de-cabeza-hexagonal-sae-grados-2-5-y-8","fr":"comment-identifier-les-vis-a-tete-hexagonale-sae-grades-2-5-et-8","id":"cara-mengidentifikasi-sekrup-tutup-kepala-hex-sae-grade-2-5-dan-8","it":"come-identificare-le-viti-a-testa-esagonale-di-grado-sae-2-5-e-8","nl":"hoe-u-sae-klasse-2-5-en-8-zeskantkopschroeven-kunt-identificeren","pl":"jak-rozpoznac-sruby-szesciokatne-sae-klasy-2-5-i-8","pt":"como-identificar-parafusos-de-cabeca-sextavada-sae-grau-2-5-e-8","ru-ru":"kak-opredelit-bolty-s-shestigrannoj-golovkoj-klassa-sae-2-5-i-8","uk-ua":"jak-viznachiti-bolti-iz-shestigrannoju-golovkoju-klasu-sae-2-5-ta-8"},"_links":{"self":[{"href":"https:\/\/nanoplast.com.ua\/cs\/wp-json\/wp\/v2\/posts\/5577"}],"collection":[{"href":"https:\/\/nanoplast.com.ua\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nanoplast.com.ua\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nanoplast.com.ua\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nanoplast.com.ua\/cs\/wp-json\/wp\/v2\/comments?post=5577"}],"version-history":[{"count":0,"href":"https:\/\/nanoplast.com.ua\/cs\/wp-json\/wp\/v2\/posts\/5577\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nanoplast.com.ua\/cs\/wp-json\/wp\/v2\/media\/5576"}],"wp:attachment":[{"href":"https:\/\/nanoplast.com.ua\/cs\/wp-json\/wp\/v2\/media?parent=5577"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nanoplast.com.ua\/cs\/wp-json\/wp\/v2\/categories?post=5577"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nanoplast.com.ua\/cs\/wp-json\/wp\/v2\/tags?post=5577"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}