Countersunk bolts thiab countersunk bolts yog ob hom tshwj xeeb bolts, uas muaj qee qhov sib txawv ntawm lub taub hau tsim thiab siv cov xwm txheej. Countersunk bolt, tseem hu ua chamfer bolt lossis countersunk ntsia hlau, muaj chamfer lossis conical taub hau tsim. Qhov kev tsim no tso cai rau lub taub hau ntsia liaj qhov rooj mus rau hauv qhov chaw ntawm cov khoom kom muaj kev sib txuas zoo. Countersunk bolts feem ntau siv rau hauv daim ntawv thov uas yuav tsum tau ua kom zoo nkauj thiab tsis ua pob. Piv txwv li, hauv kev sib txuas ntawm cov ntoo lossis cov ntawv hlau, cov bolts countersunk tuaj yeem ua rau kev sib koom ua ke ntau dua thiab tsis cuam tshuam rau kev teeb tsa lossis kev txav ntawm lwm yam khoom. Thaum lub bolts countersunk tau nruj, lub taub hau ntawm lub ntsia liaj qhov rooj yog flush nrog rau saum npoo ntawm cov khoom, thiab tsis muaj qhov protruding yuav raug tsim.
Countersunk bolt, tseem hu ua lub taub hau ntsia liaj qhov rooj los yog ntxig ntsia liaj qhov rooj, lub taub hau tsim yog ib lub tiaj tus los yog me ntsis tsa cov duab, yaug nrog rau saum npoo ntawm cov khoom los yog me ntsis tsa. Countersunk bolts feem ntau siv rau hauv cov ntawv thov uas xav tau ntau dua tensile thiab shear resistance. Vim lawv lub taub hau tsim, countersunk bolts tuaj yeem muab lub zog ntxiv thiab ruaj khov, ua rau kev sib txuas kom muaj zog. Yog li ntawd, countersunk bolts feem ntau pom muaj nyob rau hauv cov cuab yeej siv tshuab, kev sib txuas ntawm cov qauv thiab lwm lub sijhawm uas yuav tsum tau muaj zog ntau dua. Thaum xaiv seb puas siv cov bolts countersunk los yog countersunk bolts, nws yog ib qho tsim nyog yuav tau xav txog cov kev xav tau tshwj xeeb ntawm kev sib txuas thiab cov kev xav pom. Yog tias koj xav tau lub ntsej muag du thiab tsis xav tau lub pob, countersunk bolts yog qhov kev xaiv tsim nyog. Countersunk bolts yog qhov tsim nyog dua yog tias qhov kev sib txuas yuav tsum muaj zog tiv thaiv thiab ruaj khov, lossis yog tias yuav tsum muaj qee qhov bulge ntawm qhov kev sib txuas.
