Amachinescrew' sstrengthmeansitoftenisusedtojoinmachineparts, ve seçimüç vida
involvesmanyfactors.Thelengthandthicknessofthemachinescrewisimportant, becausethescrew
hastobelongenoughtojointhepiecesandthickenoughtokeepthemtogether.Thistypeofscrewcan
steelandnylon, andthisalsowilldeterminethescrew' s dahil olmak üzere
durability.Therearemanyheadshapes, suchasPhillipsheadandslottedhead, thatwilldeterminewhat
typeofdrillorscrewdrivercanbeused.Therealsoarepan, hexandflatheads.
Whenchoosingamachinescrew, youshouldlookatthepiecesyouhavetojointogether.Youshouldthen
chooseascrewthatislongenoughtogothroughthepiecesandthickenoughtokeepthemtogether.
Thicknesscanbedeterminedbythematerialofthescrew, thematerialofthepiecesandhowmuchstress
thepieceswillencounterduringuse.Forlength, thescrewshouldbeslightlylongerthantheconjoinedpieces
toensureanutcanbeplacedontheothersideofthescrewtoadherethem.
Therearemanymaterialsusedtomakeamachinescrew.Mostmaterialsaremadefrommetal, suchassteel
andbrass, butnylonandplasticalsoareused.Eachmaterialwillhaveadifferentstrength, rustresistance,
magnetismresistanceanddurability.Youshouldchooseascrewbasedonthesepropertiesandwhatyour
projectspecificallyneeds.
Tofastenamachinescrew, oneusesadrillorscrewdriverthathasacertainhead.Theheadonthescrewdriver
ordrillmustmatchtheheadonthescrew, orthetwowillbeincompatible.Choosingbetweenthedifferent
screwheadsnormallycomesdowntothetoolyouhaveandwhetheryouwantascrewthathasbetter
Tork-Phillipshead-ormoredrivingforce-slottedhead.
Alongwiththefittingatthetopofthehead, therearethreedifferentheadtypes.Aflatheadisacompletelyflat
üst, andthisnormallyisbestforprojectsinwhichthescrewshouldbeflushagainstasurface.Panheadsstick
upabitandtendtobeeasiertoremove, becausetheybumpupslightlyfromthesurface.Hexheadsoftencan
takemorestressthantheothers, andtheytendtobebetterforheavy-dutyprojects.
Pringmetalçoğu çeşit üretebilirmakine vidalarıyüksek kalite ile, özel standartlar için özel yapım vidalar da üretilebilir.
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