Lub stud yog ib qho kev sib txuas uas nquag siv hauv kev tsim kho txheej txheem. Thaum nws txoj haujlwm zoo ib yam li cov ntsia liaj qhov rooj, studs thiab bolts yeej sib koom ua ke kev sib raug zoo nyob rau hauv cov nqe lus ntawm lawv cov tswv yim siv. Tus tsim ntawm ib tug stud yog heev txawv thiab nco; Feem ntau, ib tus tuaj yeem rov nco qab nws cov yam ntxwv tseem ceeb tom qab saib ib zaug. Tsis tas li ntawd, studs kuj yooj yim siv thiab zoo - haum rau cov ntawv thov uas yuav tsum tau disassembly nquag. Cov lus hauv qab no qhia txog lub teb chaws cov qauv thiab cov kev qhia tshwj xeeb siv tau rau cov studs.
Stud National Standards thiab Specifications
Ob -kawg stud, bm=1d - GB 897-88
Ob npaug- xaus stud, bm=1.25d - GB 898-88
Ob -kawg stud, bm=1.5d - GB 899-88
Ob chav- xaus stud, bm=2d - GB 900-88
Sib npaug-ntev ob npaug- xaus stud, Qib B - GB 901-88
Vuam stud rau phau ntawv arc vuam - GB 902.1-89
Vuam stud rau mechanized arc vuam - GB 902.2-89
Vuam stud rau capacitor tawm vuam - GB 902.3-89
Sib npaug-ntev ob npaug- xaus stud, Qib C - GB 953-88
Threaded pas nrig - GB/T 15389-94