Kev hloov dua siab tshiab ntawm metric thiab Unified Inch xov

Ib tug xov yog ib tug kauv qauv siv los txuas bolts thiab ceev. Hauv ntau lub tebchaws thiab cheeb tsam, sib txawv xov txheem siv. Imperial thiab metric yog ob tus qauv ntau dua.
Nyob rau hauv tus qauv British, Cov xov xwm sib txawv yog UNC thiab UNF. UNC yog lub npe luv ntawm Unified National Coarse, uas yog hais txog kev sib koom ua ke ntawm lub teb chaws ntxhib xov; UNF yog lub npe luv ntawm Unified National Fine, uas hais txog kev sib koom ua ke hauv teb chaws zoo xov. Piv txwv, Tsis zoo li tsis tau 1/4-20 txhais tau hais tias ib lub teb chaws coarse xov nrog ib lub suab ntawm 20 TPI (threads ib nti) thiab ib txoj kab uas hla 1/4 nti.

Inch system unified threads yog dav siv nyob rau hauv nti system teb chaws. Hom xov no muab faib ua peb series: coarse xov series UNC, zoo xov series UNF, ntxiv nplua xov series UNFF, ntxiv rau lub suab taag series UN.

Kev kos duab: Xov txoj kab uas hla - tus naj npawb ntawm threads ib nti; Series code-qhov tseeb

Piv txwv: Coarse hniav series 3/8-16 UNC-2A

Fine hniav series 3/8-24 UNF-2A

Ntxiv nplua hniav series 3/8-32 UNFF-2A

Tsau suab series 3/8—20 UN—2A

Thawj tus lej 3/8 sawv cev rau sab txoj kab uas hla ntawm cov xov nyob rau hauv nti. Hloov mus rau metric unit mm, muab ntau los ntawm 25.4, uas yog, 3/8×25.4= 9,525 mm; tus lej thib ob thiab thib peb 16, 24, 32, thiab 20 yog Tus naj npawb ntawm cov hniav ib nti (tus naj npawb ntawm cov hniav ntawm qhov ntev ntawm 25.4mm); cov ntawv codes tom qab tus lej thib peb, Tsis zoo li tsis tau, Tsis zoo li, UNFF, THIAB, yog series codes, thiab ob tus lej kawg, 2A, yog qib raug.

Nws tau teev tseg nyob rau hauv cov txheej txheem sib koom ua ke uas qhov nominal loj tuaj yeem muaj qhov sib txawv. Piv txwv, 1/2 muaj 13 cov hniav, 16 cov hniav, 20 cov hniav, thiab 32 cov hniav. Tus qauv qhia tias 13 cov hniav yog cov hniav ntxhib thiab 20 cov hniav yog cov hniav zoo. 28 cov hniav yog cov hniav zoo heev; 16 hniav thiab 32 cov hniav yog ob qho tib si hu ua suab tas li, uas tsis txawv ntawm cov hniav ntxhib thiab cov hniav zoo.