Cov txheej txheem ntawm qhov paub qhov tseeb thiab tsis tseeb ntawm lub zog siab lub teb chaws bolts tsuas yog nyob ntawm 5 yam:
1. Saib ntawm lub logo, lub thawv dav dav muaj lub logo. Muab faib ua peb theem: 8.8, 10.9, thiab 12.9. Feem ntau, cov pob zeb hexagonal tsis muaj cim qhab nia ntawm lub dav hlau hexagonal, uas yog qib ntsuas zoo tib yam. High-lub zog bolts feem ntau muaj qhov ntsuas lub zog. Xws li: 8.8; Tab sis nco ntsoov tias muaj ntau cov khoom cuav thiab cov khoom lag luam qis tshaj tam sim no, thiab peb kuj yuav tsum xyuam xim rau txoj kev yuav khoom thiab kev kuaj xyuas kev yuav khoom.
2. Feem ntau, qib ntawm hexagon qhov (socket) bolts yog siab. Qhov laj thawj yog vim li cas lub pob hluav taws xob ntawm hexagon socket ntsia liaj qhov rooj feem ntau yuav tsum tau siv tom qab kho cov cua sov. Cov ntaub ntawv uas tuaj yeem kho kom ntxiv qhov nyuaj yog quenched thiab tempered steel, thiab lub quenched thiab tempered steel yog quenched thiab tempered. Muaj zog txhua yam tshuab tom qab;
3. Cov-galvanized high-lub zog bolts feem ntau yog xim dub. Dub txheej sab nraud yog txheej oxide tsim los ntawm kev ua khoom coj ua, uas yog hu ua blackening hauv kev lag luam. Nws yog ib txheej pov puag tsim los ntawm kev siv tshuaj hnyav ua kom muaj zog rau corrode hlau saum npoo, uas tuaj yeem tiv taus oxidation. Kuj tseem muaj tus txheej txheem hu ua plaub hau orchid, uas nws ua haujlwm thiab lub hauv paus ntsiab lus zoo ib yam li saum toj no. Yog li no, lub laj kab siab siab feem ntau yuav tsis xeb!
4. Qhov kev txiav txim siab yooj yim tshaj plaws: muab pov hauv qab av, mloog lub suab, lub suab sib zog kom nrov, lub suab yog qhov ci heev, nws yog sawb hlau, siv lub ntsej muag tawg thiab lwm yam cuab yeej nyuaj los txhuam qhov kev xeem, Qhov saum npoo hardness ntawm lub siab-lub zog ntsia liaj qhov rooj yog qhov dog dig Cov nplais hardness ntawm lub ntsia liaj qhov rooj yog ntau dua.
5. Cov teeb meem ntawm npau taws, cov khoom siv dav dav dav tsis kub siab li ntawm 8.8, thiab qee cov tub lag luam yuav tsis npau taws thiab muag rau cov neeg siv khoom raws li 12.9 lossis 10.9. Txoj kev uas yuav paub qhov txawv yog pom, hauv lub hnub, tsis muaj qhov npau taws Nws yog qhov yooj yim tshaj plaws.