Dab tsi yog octagonal sealing hnab?

Lub yim sab sealing lub hnab kuj hu ua yim sab sealing tiaj hauv qab hnab. Nws lub hauv qab yog tiaj tus, thiab muaj yim npoo ntawm tag nrho, yog li nws tau txais nws lub npe. Muaj 4 npoo ntawm qab, 2 npoo ntawm sab laug thiab 2 npoo ntawm sab xis, tag nrho 8 npoo.

Muaj tsib qhov chaw nyob hauv tag nrho: ib qho nyob rau hauv pem hauv ntej thiab ib qho tom qab, ib qho ntawm sab laug thiab ib qho ntawm sab xis, thiab ib qho hauv qab. Nyob rau hauv txoj kev no, lub hnab ntim octagonal tuaj yeem nqa cov ntaub ntawv xov xwm tshaj tawm thiab nthuav tawm zoo dua thiab txhawb cov khoom noj thiab cov npe. Lub hnab txhawb nqa tus kheej yog lub hnab ntim khoom uas muaj lub hauv qab quav rov qab thiab ob lub ntug sealing, ib qho ntawm sab laug thiab ib qho ntawm sab xis, thiab tuaj yeem sawv ntawm nws tus kheej tom qab qhib hauv qab.