Cov qauv ntawm cov qauv sib txawv ntawm cov qauv ntsuas pib. Ntxiv nrog rau qee qhov yooj yim xws li lub taub hau-rau-ntug, lub taub hau tuab, thiab lwm yam, qhov tseem ceeb yog qhov txawv ntawm cov xov hauv xov. GB, DIN, JIS thiab lwm cov threads yog tag nrho hauv MM (mm), collectively hu ua metric xov. Lwm cov xov zoo li ANSI, ASME, thiab lwm yam yog hu ua American Standard thread in inches. Ntxiv nrog rau qhov xov metric thiab American system ntsia hlau
Cov qauv ntawm cov qauv sib txawv ntawm cov qauv ntsuas pib. Ntxiv nrog rau qee qhov yooj yim xws li lub taub hau-rau-ntug, lub taub hau tuab, thiab lwm yam, qhov tseem ceeb yog qhov txawv ntawm cov xov hauv xov. GB, DIN, JIS thiab lwm cov threads yog tag nrho hauv MM (mm), collectively hu ua metric xov. Lwm cov xov zoo li ANSI, ASME, thiab lwm yam yog hu ua American Standard thread in inches. Ntxiv rau cov xov xov thiab Miskas xov, nws muaj tus txheej txheem BSW-nti, thiab cov xov no tseem nyob hauv nti, feem ntau hu ua Wyeth cov xov.
Cov xov metric yog nyob rau hauv MM (hli) thiab nws qhov cusp yog 60 degree. Ob tug Asmeskas thiab British cov lus yog nyob hauv nti. Lub zog ntawm cov xov tooj cua ntawm American tseem yog 60 degree, thaum lub kaum sab xis ntawm cov lus Askiv yog 55 degree. Vim yog qhov sib txawv ntawm kev ntsuas, qhov sawv cev ntawm ntau cov lus tsis yog tib yam. Piv txwv li, lub M16-2X60 nruab nrab yog ib txoj xov metric. Nws lub ntsiab lus tseem ceeb yog los qhia tias lub cev diameter ntawm lub hau yog 16 hli, lub suab yog 2 hli, thiab qhov ntev yog 60 hli. Lwm qhov piv txwv: 1 / 4-20 X3 / 4 txhais tau hais tias cov xov kab ntiv tes, thiab nws cov ntsiab lus tseem ceeb yog daim ntawv pov thawj ntawm lub hau. 1/4 nti (ib nti = 25.4 MM), 20 leeg ntawm ib nti thiab 3/4 nti ntev.
Tsis tas li ntawd, nthuav qhia American screws, UNC thiab UNF feem ntau yog ntxiv tom qab lus Askiv screws, thiaj li kom paub qhov txawv ntawm American coarse hniav thiab American nplua cov hniav. Hauv kev lag luam hauv kev lag luam, cov qauv tshaj plaws uas tau ntsib dua yog GB (GB) thiab DIN (Yelemees).