Muaj ntau lub npe rau screws, thiab lawv yuav txawv ntawm ib tug neeg mus rau lwm tus. Qee tus hu nws screws, ib tug neeg hu nws cov qauv, thiab ib tug neeg hu nws fasteners. Muaj ntau lub npe, tab sis lawv txhua tus txhais tau tib yam. Lawv tag nrho cov screws. Screw yog ib lo lus dav dav rau fastener. Lub hauv paus ntsiab lus ntawm cov ntsia hlau yog siv lub voj voog sib hloov ntawm qhov inclined nto ntawm cov khoom thiab cov qauv ntawm lub cev thiab lej ntawm kev sib txhuam, ib kauj ruam los ntawm kev zawm cov cuab yeej qhov chaw.
Screws yog qhov tseem ceeb hauv lub neej niaj hnub thiab kev tsim khoom lag luam, yog li screws tseem hu ua mov nplej. Daim ntawv thov ntawm cov ntsia hlau yog: cov khoom siv hluav taws xob, cov khoom siv tshuab, cov khoom siv digital, cov khoom siv hluav taws xob, cov khoom siv hluav taws xob thiab cov khoom siv hluav taws xob. Cov ntsia hlau kuj tseem siv hauv nkoj, tsheb, hydraulic engineering thiab txawm tias kev sim tshuaj.
Muaj ntau ntau hom ntsia hlau, tsis hais nws yog cov ntsia hlau me me rau cov tsom iav lossis cov ntsia hlau loj rau cov khoom siv hluav taws xob hnyav. Qhov tseeb ntawm cov ntsia hlau feem ntau yog 6G (qib 2, IFI yog 2A), thiab cov ntsia hlau ntxhib siv hauv kev tsim kho yog 1g.
Screw muaj ntau yam kev siv, yog li lub lag luam ntsia hlau loj dua, uas ua rau ntau tus neeg tsim khoom ntawm cov ntsia hlau. Thaum xaiv cov neeg tsim khoom lag luam ntsia hlau, cov neeg yuav khoom yuav tsum xub nkag siab qee qhov kev paub txog kev ua haujlwm ntawm cov ntsia hlau, xws li cov qauv kev faib tawm ntawm cov ntsia hlau thiab Cov Lus Qhia tshwj xeeb thiab American ntsia hlau specifications lub rooj.