Tolerances muaj xws li dimensional tolerance, shape tolerance, position tolerance, thiab lwm yam.
1. Dimension kam rau ua: yog hais txog qhov kev hloov pauv ntawm qhov tso cai qhov ntev, uas yog sib npaug rau tus nqi tseeb ntawm qhov sib txawv ntawm qhov siab tshaj plaws thiab qhov tsawg kawg nkaus qhov ntev.
2. zoo kam rau ua: hais txog tag nrho cov kev hloov pauv ntawm cov duab ntawm ib lub ntsiab lus tiag tiag, suav nrog 6 yam khoom: ncaj, flatness, roundness, cylindricity, kab profile thiab nto profile.
3. positional kam rau ua: yog hais txog tag nrho qhov tso cai hloov pauv ntawm txoj hauj lwm ntawm qhov cuam tshuam tiag tiag rau qhov ntsuas. Nws txwv kev sib koom ua ke ntawm kev sib raug zoo ntawm ob lossis ntau lub ntsiab lus, kab thiab qhov chaw ntawm qhov chaw, suav nrog 8 yam khoom: parallelism, verticality, inclination, coaxiality, symmetry, positional degree, ncig dhia thiab dhia tag nrho. Kev kam rau siab sawv cev rau kev tsim khoom kom raug ntawm cov khoom thiab qhia txog qhov nyuaj ntawm kev ua haujlwm. Qib kam rau ua tau muab faib ua 20 qib: IT01, IT0, IT1,..., IT18. Cov theem yog txo nyob rau hauv lem, thiab tus nqi kam rau siab yog nce nyob rau hauv lem. Nws txhais tau tias kev kam rau siab thoob ntiaj teb.
