Qhov txawv ntawm Imperial Fasteners thiab Metric Fasteners

Dab tsi yog qhov txawv ntawm imperial thiab metricfasteners? Qhov tseeb, nws yooj yim to taub. Ua ntej tshaj plaws, lub imperial system yog ib qho kev ntsuas uas siv nyob rau hauv cov teb chaws hais lus Askiv xws li United Kingdom thiab United States. Vim muaj ntau yam keeb kwm vim li cas, lub imperial system yog heev nyuaj. Lub metric system tseem hu ua "meter system" thiab "meter system". Nws yog lub thoob ntiaj teb qhov hnyav thiab ntsuas qhov system qhia rau Tuam Tshoj tom qab kos npe rau "Sino-French Commercial Charter" hauv 1858. Founded hauv Fabkis. Thaum lub Plaub Hlis 7, 1795, Fabkis National Assembly tau txiav txim siab tshaj tawm Mitu system cov cai.

Raws li qhov no, vim muaj kev sib txawv ntawm cov kab lis kev cai hauv cheeb tsam sib txawv, cov ntsuas ntsuas uas sawv cev los ntawm ob qhov sib txawv. Ua ntej, cov xov inch yog cov xov loj cim hauv nti. Nws muab faib ua ob hom: lub tog raj kheej thiab lub khob hliav qab raws li cov duab; Raws li tus hniav lub kaum sab xis 55 degree, 60 degree ob yam. Cov 1/4, 1/2, thiab 1/8 cov cim hauv xov xa mus rau txoj kab uas hla ntawm cov xov loj hauv nti. Ib nti yog 8 xees, 1/4 nti yog 2 xees, thiab lwm yam.

Qhov sib txawv loj tshaj plaws ntawm metric threads thiab inch threads yog tias lub suab yog ntsuas hauv millimeters. Metric threads suav nrog cov xov zoo tib yam (cov hniav kaum sab xis 60 degree); trapezoidal threads (cov hniav kaum rau 30 degree); zigzag threads (lub kaum sab xis rau 33 degree); square threads, thiab lwm yam. Cov xov metric yog sawv cev los ntawm lub suab, cov metric xov yog 60-degree equilateral hniav hom, thiab imperial xov yog ib qho isosceles 55-degree hniav hom.

Paub qhov no, cia peb saib ntawm imperial fasteners thiab metric fasteners. Rau imperial thiab metric fasteners, tshwj xeeb tshaj yog threaded fasteners, nws zoo nkaus li tias lawv qhov sib txawv tsuas yog tshwm sim los ntawm cov ntsuas sib txawv. Hauv kev siv Nws tsuas yog tsim nyog los ua qhov tsim nyog suav hloov pauv ntawm nti thiab millimeters, tab sis nws puas yog qhov yooj yim?

Qhov luaj li cas ntawm threaded fasteners, txawm nws yog imperial los yog metric, feem ntau yog lub nominal txoj kab uas hla, suab, ntxiv rau ib tug ntev dimension, tab sis daim ntawv qhia yog txawv.

Nyob rau hauv cov xov specification ntawm British threaded fasteners, tus xov tooj ntawm cov hniav yog ib txwm tso tawm ncaj qha tom qab xov txoj kab uas hla, xws li 1/4-28, qhov twg 28 txhais tau tias 28 hniav ib nti, uas yog, lub suab yog 1/28. nti. Nyob rau hauv metric threaded fasteners, tsis muaj xws li parameter nyob rau hauv cov xov specification, lub suab yog teev raws li qhov kev ncua deb ntawm ob tug nyob ib sab xov crests, xws li M10X1.25, lub suab teev ntawm no yog 1.25 hli, thiab tsis muaj naj npawb ntawm cov hniav ib. chav nyob deb.

Yog li tej zaum yuav muaj qee qhov tsis meej pem ntawm no, vim tias imperial fasteners tsis piav txog qhov tseeb crest-rau-crest deb, tab sis txhais tau tias yog cov xov tooj ntawm ib nti. Yog tias koj xav hloov pauv ntawm ob, piv txwv li, thaum hloov metric mus rau imperial, koj thawj zaug yuav tsum hloov lub suab hauv qhov metric loj ntawm millimeters mus rau ntiv tes, thiab tom qab ntawd nrhiav qhov rov qab.

Rau qhov ntev sawv cev ntawm sab nraud threaded fasteners, imperial thiab metric ntsuas txoj kev yog tib yam. Rau lub taub hau tiaj tus fasteners, qhov ntev suav nrog lub taub hau qhov siab. Rau txiv neej lub taub hau fasteners, qhov ntev yog xam los ntawm lub hauv qab ntawm lub taub hau. Qhov sib txawv ntawm lawv tsuas yog cov units, nrog rau metric system siv millimeters thiab imperial system siv ntiv tes.

Rau metric fasteners, qhov loj ntawm txoj kab uas hla, qhov loj dua "lub taub hau" ntawm lub fastener; qhov loj dua tus naj npawb, qhov tuab ntawm cov xov, uas yog, cov xov tsawg dua ib chav tsev loj; qhov loj qhov ntev tus nqi, qhov nruj Qhov ntev ntawm daim.

Hais txog kev sib piv ntawm imperial system thiab metric system, lwm qhov tseem ceeb ntawm kev ntsuas yog lub zog. Yog li 8.8 qib ntawm metric fastener zoo ib yam li 8 qib ntawm imperial fastener?

Cov lus teb yog twv yuav raug hu tsis muaj, lawv zoo sib xws tab sis yuav luag sib txawv. Tshooj 3.4 ntawm SAE Standard J1199 (Mechanical and Material Requirements for Metric Externally Threaded Steel Fasteners) muab kev taw qhia txog kev hloov pauv ntawm qib metric thiab imperial zog, uas suav nrog yim chav kawm ntawm cov khoom siv hlau. Mechanical thiab cov khoom yuav tsum tau rau threaded metric fasteners nyob rau hauv qhov ntau thiab tsawg M1.6 rau M36 rau ntau yam kev siv.

Metric fastener zog yog sawv cev los ntawm cov khoom vaj tse uas sib haum rau cov chav kawm muaj zog, luv luv luv luv hauv qab no:

Metric Qib 4.6 yog kwv yees sib npaug rau SAEJ429 Qib 1 thiab ASTM A307 Qib A

Metric qib 5.8 yog kwv yees sib npaug rau SAEJ429 qib 2

Metric Qib 8.8 yog kwv yees sib npaug rau SAEJ429 Qib 5 thiab ASTM A449

Metric Qib 9.8 yog kwv yees li 9 feem pua ​​​​muaj zog dua qhov sib npaug SAEJ429 Qib 5 thiab ASTM A449

Metric Qib 10.9 yog kwv yees sib npaug rau SAEJ429 Qib 8 thiab ASTM A354 Qib BD