Thaum xub thawj siab ib muag, qhov txawv zoo li yooj yim: metric siv millimeters, imperial siv ntiv tes (1 nti=25.4 hli). Tab sis qhov teeb meem tiag tiag yog nyob rau hauv xov geometry - lub kaum sab xis ntawm cov xov flank thiab lub suab (qhov deb ntawm cov xov). Metric threads muaj 60℃flank lub kaum sab xis; imperial (UN series) kuj siv 60 degree, tab sis lub suab yog qhia txawv, thiab cov diameters tsis line li zoo.Cov kab hauv qab: lawv tsis sib hloov. Kev quab yuam lub metric bolt rau hauv cov txiv ntoo imperial zoo li jamming lub USB -Plug rau hauv USB-C chaw nres nkoj - lawv zoo li lawv tuaj yeem haum, tab sis lawv tsis ua. Qhov zoo tshaj plaws, koj tau txais kev sib txuas xoob; qhov phem tshaj, koj strip ob threads.
Lub Metric System - Huv, logical, ntiaj teb no
Metric threads (tsim nrog "M") yog tus qauv qub rau feem ntau ntawm lub ntiaj teb - Tebchaws Europe, Tuam Tshoj, Nyiv, thiab txhua lub tebchaws uas siv SI system. Lub logic yog ncaj nraim:
- Lus cim:M6 × 1.0 - uas txhais tau tias lub nominal txoj kab uas hla ntawm 6 hli thiab ib lub suab ntawm 1.0 hli (qhov kev ncua deb ntawm ib tug xov crest mus rau lwm yam).
- Yog hais tias lub suab tsis tau teev tseg, nws yog suav tias yog qhov ntxhib (tus qauv) suab. Yog li M6 ib leeg txhais tau tias M6 × 1.0.
Coarse vs. Zoo:
Tib txoj kab uas hla, txawv suab.
- M6 × 1.0 ( ntxhib) - lub hom phiaj dav dav, lub zog zoo, sib dhos ceev.
- M6 × 0.75 (zoo) - xov zoo dua rau kev kaw zoo dua hauv kev vibration thiab kev kho kom zoo dua.
Qhov ntau thiab tsawg metric koj yuav khiav mus rau:
- M3 - me me electronics, computer case
- M4 - cov khoom vaj khoom tsev, hloov daim hlau
- M5 - tsheb kauj vab, rooj tog
- M6 - tus neeg ua haujlwm - tsheb, tshuab, koj lub npe
- M8 - cav mounts, khoom nruab nrab
- M10 - qhov chaw ncua kev kawm ntawv, cov khoom sib dhos
- M12 thiab nce - cov tshuab hnyav, kev tsim kho
Lub Imperial System - Lub Tsev Kawm Ntawv Qub, Tseem Txhua Qhov Chaw hauv Asmeskas
Imperial threads yog qhov tseem ceeb hauv Tebchaws Meskas, UK, thiab qee yam kev lag luam qub txeeg qub teg - tsheb, aerospace, kav dej, thiab ntau yam cuab yeej siv tshuab qub. Txawm hais tias Teb Chaws Asmeskas tau lees paub qhov kev ntsuas kev ntsuas rov qab rau xyoo 1970, tus nqi ntawm kev rov kho dua thiab rov ua haujlwm tau ua rau imperial ciaj sia nyob rau hauv kev xyaum.
- Piv txwv hais tias:1/4-20 UNC
- 1/4=nominal txoj kab uas hla hauv nti (1/4 nti ≈ 6.35 mm)
- 20=tus naj npawb ntawm threads ib nti (pitch yog tus reciprocal, roughly 1.27 mm)
- UNC=Unified National Coarse – kuj muaj UNF (zoo) thiab UNEF (zoo ntxiv).
- Qhov ntau thiab tsawg imperial thiab lawv metric approximations (tab sis tsis txhob sib tov lawv):
- #6-32 (~ 3.5 hli) – US electronics
- #8-32 (~ 4.2 mm) - Cov khoom siv hauv Asmeskas
- #10-24 (~ 4.8 mm) - kho vajtse dav dav
- 1/4-20 (6.35 hli) - US tsheb, rooj tog
- 5/16-18 (7.94 mm) - cov pob qij txha nruab nrab
- 3/8-16 (9.53 hli) - dav dav machinery
- Nco ntsoov cov lejkawmus rau metric sib npaug tab sis yeej tsis zoo ib yam. Qhov 0.35 hli qhov sib txawv ntawm 6 hli thiab 1/4 nti yog txaus los rhuav tshem koj hnub.
Yuav Qhia Li Cas Rau Lawv - Peb Txoj Kev Ntseeg
Thaum koj tuaj nqa ib lub ntsia hlau tsis paub, ntawm no yog yuav ua li cas thiaj paub tias tsev neeg twg yog:
- Ntsuas txoj kab uas hla- siv lub caliper.
- Raws nraim 6.00 hli → tej zaum M6 metric.
- Nyob ib ncig ntawm 6.35 mm → zoo li 1/4 ″ imperial.
- Nyob ib ncig ntawm 7.94 mm → zoo li 5/16 ″ imperial.
- Ntsuas lub suab- siv ib tug xov paj gauge.
- M6 ntxhib → 1.0mm suab.
- 1/4-20 → 20 threads ib nti (kwv yees 1.27 mm).
- Tsis ntsuas? Suav 10 threads thiab faib tag nrho ntev los ntawm 10.
- Kuaj- haum nrog cov txiv ntseej paub- Yog tias koj muaj cov txiv ntoo los ntawm qhov system paub, sim nws. Kev sib koom ua ke zoo txhais tau tias koj tau pom qhov sib tw. Qhov no yog qub- tsev kawm ntawv tab sis tsis muaj phom.
Thaum kawg Takeaway
- Metric: hli rau txoj kab uas hla thiab suab, 60℃kaum sab xis, sau npe M × suab.
- Imperial: ntiv tes rau txoj kab uas hla, xov ib nti, 60℃(UNC / UNF) lossis 55℃(Whitworth), sau npe zoo li 1/4-20 UNC.
- Lawv tsis hla- sib haum - tsis txhob yuam lawv.
- Txheeb xyuas los ntawm kev ntsuas txoj kab uas hla, suab, lossis kev sim- haum.
- Qhov kev sib cais yog keeb kwm, hauv paus hauv kev lag luam hauv teb chaws, thiab tsis ploj mus sai sai - yog li kawm ob qho tib si yog tias koj ua haujlwm nrog kho vajtse.
Kev nkag siab txog ob lub tshuab no tsis yog hais txog kev xaiv lub bolt txoj cai - nws yog hais txog kev hwm cov txheej txheem engineering thiab zam kev ua yuam kev kim. Thiab qhov ntawd yog ib qho kev paub uas tsis tau tawm ntawm txoj xov.
