{"id":26,"date":"2026-08-04T09:00:00","date_gmt":"2026-08-04T07:00:00","guid":{"rendered":"https:\/\/www.matai.cz\/blog\/utahovaci-moment-tabulka\/"},"modified":"2026-06-26T15:00:19","modified_gmt":"2026-06-26T13:00:19","slug":"utahovaci-moment-tabulka","status":"publish","type":"post","link":"https:\/\/www.matai.cz\/blog\/utahovaci-moment-tabulka\/","title":{"rendered":"Utahovac\u00ed momenty \u0161roub\u016f \u2014 tabulka dle pr\u016fm\u011bru a t\u0159\u00eddy"},"content":{"rendered":"

Spr\u00e1vn\u011b uta\u017een\u00fd \u0161roubov\u00fd spoj je z\u00e1klad bezpe\u010dn\u00e9 a spolehliv\u00e9 mont\u00e1\u017ee. P\u0159\u00edli\u0161 mal\u00fd moment znamen\u00e1 nedostate\u010dn\u00e9 p\u0159edp\u011bt\u00ed a riziko povolen\u00ed spoje vibracemi, p\u0159\u00edli\u0161 velk\u00fd moment naopak \u0161roub p\u0159et\u00ed\u017e\u00ed, nat\u00e1hne za mez kluzu nebo utrhne. V tomto \u010dl\u00e1nku najdete orienta\u010dn\u00ed tabulku utahovac\u00edch moment\u016f<\/strong> pro b\u011b\u017en\u00e9 pr\u016fm\u011bry M6 a\u017e M20 a pevnostn\u00ed t\u0159\u00eddy 8.8, 10.9 i nerez A2-70, spolu s vysv\u011btlen\u00edm, pro\u010d na maz\u00e1n\u00ed z\u00e1vitu opravdu z\u00e1le\u017e\u00ed.<\/p>\n

Co je utahovac\u00ed moment a p\u0159edp\u011bt\u00ed<\/h2>\n

Kdy\u017e utahujete \u0161roub, vyvozujete v n\u011bm tahovou s\u00edlu – takzvan\u00e9 p\u0159edp\u011bt\u00ed<\/strong> (anglicky preload<\/em> nebo clamp load<\/em>). Pr\u00e1v\u011b toto p\u0159edp\u011bt\u00ed dr\u017e\u00ed spoj pohromad\u011b a br\u00e1n\u00ed povolen\u00ed. Utahovac\u00ed moment (v Nm) je jen nep\u0159\u00edm\u00fd n\u00e1stroj<\/em>, jak po\u017eadovan\u00e9 p\u0159edp\u011bt\u00ed dos\u00e1hnout: to\u010divou silou na kl\u00ed\u010di p\u0159ekon\u00e1v\u00e1te t\u0159en\u00ed a \u0161roub natahujete.<\/p>\n

Probl\u00e9m je, \u017ee naprost\u00e1 v\u011bt\u0161ina vynalo\u017een\u00e9ho momentu se spot\u0159ebuje na t\u0159en\u00ed, nikoli na nata\u017een\u00ed \u0161roubu. Z celkov\u00e9ho momentu se zhruba polovina ztrat\u00ed t\u0159en\u00edm pod hlavou (resp. matic\u00ed)<\/strong>, dal\u0161\u00edch p\u0159ibli\u017en\u011b 40 % t\u0159en\u00edm v z\u00e1vitu<\/strong> a jen kolem 10 %<\/strong> se re\u00e1ln\u011b p\u0159em\u011bn\u00ed na u\u017eite\u010dn\u00e9 nata\u017een\u00ed \u0161roubu. Proto je t\u0159en\u00ed – a tedy i maz\u00e1n\u00ed – tak z\u00e1sadn\u00ed.<\/p>\n

Orienta\u010dn\u00ed tabulka utahovac\u00edch moment\u016f<\/h2>\n

N\u00e1sleduj\u00edc\u00ed hodnoty plat\u00ed pro metrick\u00fd hrub\u00fd z\u00e1vit, koeficient t\u0159en\u00ed p\u0159ibli\u017en\u011b \u03bc = 0,14<\/strong> (b\u011b\u017en\u00fd m\u00edrn\u011b mazan\u00fd nebo pozinkovan\u00fd stav) a vyu\u017eit\u00ed cca 90 % meze kluzu. Jde o orienta\u010dn\u00ed hodnoty<\/strong> – v\u017edy ov\u011b\u0159te konkr\u00e9tn\u00ed doporu\u010den\u00ed v\u00fdrobce, normu spoje a stav z\u00e1vitu.<\/p>\n\n\n\n\n\n\n\n\n\n\n
Z\u00e1vit<\/th>\nT\u0159\u00edda 8.8 (Nm)<\/th>\nT\u0159\u00edda 10.9 (Nm)<\/th>\n<\/tr>\n<\/thead>\n
M6<\/td>\n10<\/td>\n14<\/td>\n<\/tr>\n
M8<\/td>\n25<\/td>\n36<\/td>\n<\/tr>\n
M10<\/td>\n46<\/td>\n67<\/td>\n<\/tr>\n
M12<\/td>\n82<\/td>\n120<\/td>\n<\/tr>\n
M16<\/td>\n206<\/td>\n302<\/td>\n<\/tr>\n
M20<\/td>\n407<\/td>\n580<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Pozn.: Hodnoty jsou orienta\u010dn\u00ed (\u03bc = 0,14). P\u0159i jin\u00e9m t\u0159en\u00ed se mohou v\u00fdrazn\u011b li\u0161it.<\/em><\/p>\n

Nerezov\u00e9 \u0161rouby A2-70 a A4-70 maj\u00ed jin\u00e9 momenty<\/h2>\n

Nerezov\u00e9 \u0161rouby v pevnostn\u00ed t\u0159\u00edd\u011b 70 (A2-70, A4-70) odpov\u00eddaj\u00ed zhruba pevnostn\u00ed \u00farovni mezi t\u0159\u00eddami 8.8. Maj\u00ed ale v\u00fdrazn\u011b vy\u0161\u0161\u00ed sklon k zad\u00edr\u00e1n\u00ed (galling)<\/strong> – zejm\u00e9na p\u0159i rychl\u00e9m utahov\u00e1n\u00ed, pou\u017eit\u00ed r\u00e1zov\u00fdch utahov\u00e1k\u016f nebo bez maz\u00e1n\u00ed. Proto se pro nerez pou\u017e\u00edvaj\u00ed ni\u017e\u0161\u00ed a opatrn\u011bj\u0161\u00ed momenty:<\/p>\n\n\n\n\n\n\n\n\n
Z\u00e1vit<\/th>\nA2-70 \/ A4-70 (Nm, orienta\u010dn\u011b)<\/th>\n<\/tr>\n<\/thead>\n
M6<\/td>\n~7<\/td>\n<\/tr>\n
M8<\/td>\n~17<\/td>\n<\/tr>\n
M10<\/td>\n~33<\/td>\n<\/tr>\n
M12<\/td>\n~57<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

U nerezu d\u016frazn\u011b doporu\u010dujeme z\u00e1vit mazat<\/strong> (pasta proti zad\u00edr\u00e1n\u00ed, MoS\u2082) a utahovat pomalu, ide\u00e1ln\u011b momentov\u00fdm kl\u00ed\u010dem, nikoli r\u00e1zov\u00fdm utahov\u00e1kem. Kvalitn\u00ed nerezov\u00e9 \u0161rouby DIN 933 A2<\/a> i odoln\u011bj\u0161\u00ed varianta A4 (316)<\/a> snesou opakovanou mont\u00e1\u017e jen p\u0159i spr\u00e1vn\u00e9 technice. K p\u0159enosu p\u0159edp\u011bt\u00ed p\u0159es matici s\u00e1hn\u011bte po odpov\u00eddaj\u00edc\u00edch matic\u00edch A4<\/a>.<\/p>\n

Such\u00fd vs mazan\u00fd z\u00e1vit: rozd\u00edl je obrovsk\u00fd<\/h2>\n

Maz\u00e1n\u00ed je nej\u010dast\u011bj\u0161\u00ed p\u0159\u00ed\u010dinou rozd\u00edlu mezi teoretick\u00fdm a skute\u010dn\u00fdm p\u0159edp\u011bt\u00edm. Plat\u00ed jednoduch\u00e9 pravidlo:<\/p>\n