Raws li qhov kev sib txuas bears load, bolts tau muab faib ua ob hom: tus qauv bolts thiab bolts tsim los siv rau hauv qhov reamed. Raws li lub taub hau zoo, ntau yam muaj xws li hexagonal hau, puag ncig lub taub hau, square hau, countersunk taub hau, thiab lwm yam; ntawm no, lub taub hau hexagonal yog feem ntau siv. Feem ntau, countersunk taub hau yog ua hauj lwm nyob rau hauv daim ntawv thov qhov twg ib tug flush nto yuav tsum tau nyob rau ntawm qhov chaw sib txuas.
U-bolts (paub ua lus Askiv li "U-bolts") tsis yog- tus qauv fasteners. Vim lawv qhov txawv U-puab, lawv kuj raug hu ua "U- hom bolts." Ob qhov kawg feature threads tsim los koom nrog txiv ntseej. Lawv feem ntau yog siv los tiv thaiv cov khoom siv tubular-xws li cov kav dej- lossis cov khoom tiaj tus, xws li cov nplooj ntoo hauv tsheb. Lub npe "U-bolt" (lus txhais tau tias "sib-nees bolt" hauv Suav) yog los ntawm qhov tseeb hais tias tus yam ntxwv uas nws ruaj ntseg ib yam khoom zoo li tus neeg caij nees. Raws li xov ntev, lawv tau faib ua ob hom: tag nrho threaded thiab ib nrab threaded.
Raws li xov profile, threads tau muab faib ua ob hom: coarse suab thiab nplua suab. Cov ntxhib- lub suab npe feem ntau raug tshem tawm los ntawm lub bolt cov cim. Bolts tau muab faib ua yim qib: 3.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, thiab 12.9. Bolts ntawm Qib 8.8 thiab siab dua (nrog rau 8.8) yog tsim los ntawm qis- carbon alloy steel lossis nruab nrab- carbon steel thiab tau txais kev kho cua sov (quenching thiab tempering); cov no suav nrog hu ua "siab- zog bolts." Bolts hauv qab Qib 8.8 (tsis suav nrog 8.8) yog sau ua ke hu ua "ib txwm bolts."
Cov bolts zoo ib yam tau muab faib ua peb qib -A, B, thiab C- raws li lawv qhov raug tsim. Qib A thiab B sawv cev rau "precision-tiav" bolts, thaum Qib C sawv cev rau " ntxhib-tiav" bolts. Rau kev sib txuas bolts siv hauv cov qauv steel, tshwj tsis yog tias tau teev tseg, tus qauv xaiv yog qhov qub, ntxhib -Tiav Qib C bolt. Cov txheej txheem tsim khoom sib txawv ntawm cov qib no, feem ntau sib xws raws li hauv qab no: Cov shanks ntawm Qib A thiab B bolts yog machined ntawm lub tshuab dhos, uas ua rau cov npoo du thiab meej qhov ntev; cov bolts no feem ntau muaj cov khoom ua tau zoo ntawm 8.8. Txawm li cas los xij, lawv cov txheej txheem tsim khoom thiab kev teeb tsa yog qhov nyuaj, thiab lawv cov nqi kuj tseem siab, ua rau lawv tsis tshua siv. Qib C bolts yog tsim los ntawm unmachined round steel tuav; Yog li ntawd, lawv qhov ntev yog qhov tsis tshua muaj tseeb, thiab lawv cov khoom siv qib siab feem ntau yog 4.6 lossis 4.8. Thaum lawv nthuav tawm ntau dua deformation thaum siv hauv kev sib txuas shear, lawv muab kev yooj yim ntawm kev teeb tsa thiab cov nqi tsim khoom tsawg; Yog li ntawd lawv tau nquag siv hauv kev sib txuas nro lossis rau kev sib txuas ib ntus thaum sib dhos.
